BHR Cadwell Park 25-26 September 2021 (Part 1 & 2)

Andy J

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Location
Isle of Man
Having scrapped the planned trip to Spa for the Belgian round of the European Endurance Classic Club Andy B and I dragged our sorry arses over to the other side of the country instead to Cadwell Park for the final round of the British Historic Racing season. Although not quite in the same league as Spa, Cadwell is still an interesting and, in places, a challenging circuit to ride and as I had never previously raced at the venue it seemed like a reasonable alternative. It also gave me the opportunity to acquire additional signatures towards next year's IOM 'mountain course' licence.

Just to add an additional bit of excitement to the weekend, we also had to contend with the sudden panic buying of fuel, just because a few petrol stations hadn't been refuelled due to a shortage of tanker drivers, not fuel. As it happens we found fuel for the van and bike without too much effort, but drove past plenty of 'dry' filling stations on the way there and back.

The choice of steed for the event was somewhat dictated by the availability of a usable, race prepared bike. My preferred choice would have been the Monty I 'paraded' at Cadwell the previous month at the VMCC 75th anniversary track weekend, but the early signs of a blowing head gasket meant that I was reluctant to risk it, and there wasn't sufficient spare time to fit a new one.

Therefore, the only alternative was the Alpino 'track bike' I had raced at the BHR, Three Sisters round in 2019. In 2019, the bike had been an ideal choice given the wet conditions and the circuit is essentially designed for karts, but on this occasion, with generally fine, dry weather predicted, it was definitely going to be struggling in the power stakes.

Furthermore, the bike hadn't turned a wheel since the event in 2019, and a few of the parts, including the rear shocks, had been substituted for others. There was also a slight oil weep coming from seemingly somewhere around the back of the engine, but insufficient to identify the source.

But undeterred by this I had Andy B give the bike a bit of a check over including an oil change and fit a newly donated quick action throttle (thanks Matt). He reported the bike was starting up easily and running well. A bit of a discussion was held on what gearing to run and in the end I decided to settle for the standard 42 rear sprocket, which had worked good enough on the Monty the previous month.

We left Andy's place around 4pm Friday and endured a painfully slow journey to the circuit, which meant it was dark by the time we arrived. Despite this we managed to get the awning erected, the bike out of the van and, following a late supper of Andy's home-cooked chilli, completed a few final preparations for racing, such as fitting the transponder. Surprised by how late it was by then we turned in for the night, knowing an early start was required to get the bike through scrutineering at the earliest opportunity.

As it turned out, scrutineering was a cursory affair, totally visual given they were still operating covid protocols and the bike passed with no issues. We didn't even get noise tested during the weekend. However, I initially 'failed' my kit inspection as in my rush to catch the ferry I had left my dog tag behind. A bit of white card, with my details on, and hung around my neck satisfied the 'inspector' at the second time of asking.

I opted to go out in the first of three practise sessions, with the 'nutters' as one fellow competitor described that particular cohort, in case any issues surfaced and needed time to be resolved. This proved to be a good call.

Not for the only time during the weekend we seemed to be held in the holding area for an inordinate amount of time. As the bike got hotter and hotter, and as hot oil fumes started to gas me, I killed the engine and hoped it would start again once the organisers were ready to let us out to play. Fortunately, it did start, when called upon, without much effort.

As at Pembrey, I settled on a cautious pace to start with, to reacquaint myself with the circuit and to check that everything was in order. From almost the word go something seemed amiss. The rear end of the bike was moving around far more than expected, and a short time later a dragging noise started to emanate from somewhere beneath me. A glance down couldn't immediately identify any obvious issue but after another lap of intermittent scrapping noises I pulled off the circuit by the start line pit lane for a better look. I didn't bother getting off the bike but had a good lean over to the left and right side to check the belly pan hadn't come adrift or that the shark's fin wasn't loose. Again no obvious sign of what was causing the noise, so I just thought it might be the belly pan vibrating and carried on for another couple of laps at moderate speed, given the noise continued plus the bike seemed to be wallowing somewhat.

Once back in the pits it didn't take long to identify the cause of the scrapping noise, the home-made, perspex and thin aluminium rear 'mudguard' had partially come adrift and was dragging on the rear tyre. Fortunately it didn't appear to have caused any significant damage to the tyre, just a little bit of extra wear on the centre. A pair of tin snips solved that problem and it was unceremoniously removed. A cursory examination of the shocks also suggested too much travel and they were jacked up a couple of turns to stiffen them up.

However, even more concerning was where before there had been a small amount of oil around the rear of the engine there was now a liberal coating of oil and a small, but steady drip into the oil catch tray on the right hand side of the bike.

Andy whipped the tank off and to his surprise discovered the bolt holding the cam chain tensioner blade had 'disappeared'. No wonder there was oil escaping, there was now a small hole in the engine. Fortunately, it was an easy fix and once a new bolt was inserted the oil 'leak' problem dried up.

By now, we had also sussed out my main 'competition' for the weekend, a seasoned competitor, Phil Bootherstone (who I immediately gave the nickname 'Bothersome') on a Morini 500, which, on the face of it, looked much better prepared for racing than my 'low budget' racer. On paper his bike, even if it was in standard trim, has marginally more power and torque, and less weight than the virtually bog standard Alpino I was riding. Never-the-less I wasn't going to let that worry me and was determined to end the weekend as top dog in the Italian middleweight bike stakes.

TBC
 

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Yes, I travelled over late Thursday evening to the UK. For the first time in ages I had a pretty clear run down the M6/M5 from Heysham, without any off motorway diversions, and arrived at Cheltenham at just after 2am. Quite often, with all the bloody roadworks, it can be nearer 3am. Gave myself a bit of a lie-in before transferring the gear I brought from the island into the race van, along with loading the ‘T’ bike that had been left at my mother’s following the VMCC track event.
Was hoping to get to Andy B’s shortly after lunch, to load the ‘track bike’ etc, but the normal 20 minute journey took an hour the traffic was that bad, which set the tone for the rest of the journey to Cadwell.
 
I've forgotten what 'traffic' is - been in lockdown so long it's faded from my memory - probably one of the only plusses about lockdown! It;'s actually pleasant riding a bicycle on main roads ATM.
 
Part 2 - Saturday's Racing

My first competitive outing was race 7, the usual mix of BEARS, Earlystocks, Super Monos, etc and on this occasion an additional class, 251cc-350cc solos 1963-1972 featuring Bill Swallow on a 7R.

The BEARS competitors were allocated the arse end of the grid, so far back from the lights that you almost needed a telescope to see them, and a good start was going to be paramount. Lights on, lights off and two orange Laverdas lept forward, me and Gareth Roberts on his SF750, but no-one else. Bum, quick stop and a back pedal into a stationary SF; we had overlooked said 251-350 had a 20 second start on the main pack!

A few seconds later, lights on and off again and this time we were go. The poor old Alpino was quickly blitzed by the larger capacity bikes in the run up to Coppice and the pattern for the weekend was set. The fast riders on the quick bikes would clear off and I would be left dicing with the lower order riders with bikes that passed me down the two straights but carried far less speed into the bends, braked earlier into the corners and generally held me up through the twisty bits. On several occasions I was nearly caught out by the rider(s) ahead of me on 'bigger' bikes unexpectedly slowing down or braking when I was still on the gas. Added to this, despite the adjustment to the shocks, the rear of the bike was still misbehaving and upsetting the handling. However, I was keeping ahead of Bothersome but this was to change towards the end of the third lap. Having traversed the 'Mountain' I caught a rider on a Seeley Goldstar, but got baulked by him on the short straight in the run into the Hall Bends which leads into the Hairpin. Unfortunately, Bothersome had sneaked up on us and took advantage of the situation and nipped past the pair of us. Bother! Not wanting him to get away, on the exit of the Hairpin I whacked the throttle open whilst still lent over and the bike, even with it's modest power output, was virtually sideways before I knew it. By the time forward motion was resumed, Bothersome had already rounded Barn Corner and had blasted off down the start/finish straight. Bother! I set off in pursuit, quickly passed the Goldie but although I closed the gap on Bothersome I couldn't quite make the pass on my bucking bronco of a bike and he crossed the finishing line a few yards ahead of me. Bother!

Not to worry I thought, another two races today to make amends. However, it was not to be as the programme wasn't running to schedule, partly due to an over ambitious number of races and partly due to incidents delaying things further.

The evening was spent chilling out and holding a bit of a post mortem on the day's events.
 
Aaahhh! Not the way you envisage the race is it. It sounds like a call to Maxton is on the cards. Good on you for being there. How did Gareth fare?
 
Aaahhh! Not the way you envisage the race is it. It sounds like a call to Maxton is on the cards. Good on you for being there. How did Gareth fare?
Hi Tippie,
I thought I would reply , being at Cadwell .
AJ had another 500 in the back of the race transporter so I nicked the shocks off that to return the handling to some sort of normality !
The bike is a standard early 500, and is a bitsa , competitive fun. Nothing too serious but capable in AJ hands of picking up signatures within BHR club events.

Andy
 
Aaahhh! Not the way you envisage the race is it. It sounds like a call to Maxton is on the cards. Good on you for being there. How did Gareth fare?
Gareth had another disappointing w/e with the 750, which was irritating for him as apparently it had run fine on the Friday track day. I think he did a few laps in practice and one DNF. However, he did manage to complete some races on the Honda 900.
 
Sorry for crashing Andy's thread but as I was asked, I'll add my bit.

I took the SF750 and my CB900F to the track day on the Friday to set up the Honda for the race weekend and to run round on the Laverda. The SF went really well and apart from a few gear change issues we had a great time. I hired an instructor to give me some guidance and he confirmed the Honda was touching down on most of the right handers and that I needed to hang off more if I wanted more corner speed. The rebound damping was all off but by the end of the weekend I'd got the Honda running beautifully, although not very fast as it won't breach 100mph along the straights. Still, it'll do sub 2 minute laps and I ended up 2nd in the Japanese air cooled pre-1982 unlimited class.

The Laverda didn't like the weekend. I'd fitted a brand new Sachse ignition system, coils, leads plugs etc and made sure the sparks were big and clean and she ran fine on the Friday. Come Saturday the gear change issues became a bigger problem and she started to splutter on the two big right hand sections (Coppice/Charlies, then Park/Chris). Both of these were after the long straights. Phil Todd came along and gave me some excellent suggestions which we put into place for the Sunday. The main one was to resolve my gear change problem - it would go 2, 3, neutral then 5th gear. Saturday afternoon I knew that to go up a gear from third I needed to move the lever up, clutch out (false neutral), no revs, up again, clutch out (into 5th) then down into 4th. I was getting the hang of this but it did slow one down on the straights. Phil showed me how to loosen the mesh between the selector rod and the gear change drum and when I did that, it worked a treat. The only lingering issue was the length of the gear change arm which was too short to get my boot under - so when going up the gears I had to take my foot off the peg to allow my toe to fit under the lever. As it is a fixed lever arrangement (beautifully made I'll add), there was no adjustment so it'll have to be replaced over winter.

Then there were the fuel issues. A thorough analysis of the problem and where it occurred led us to believe the carbs were being starved of fuel because after a long run at full throttle down the straights, in the next section the bike would splutter giving me no confidence when "smoothly" rolling on the throttle. Fortunately the Contis stuck like glue as the bike rocked back and forward. We messed about with fuel taps, hoses and new fuel but in both races I couldn't complete the formation lap properly and returned to the pits.

Given the fuel crisis, I decided to drain the tank so I had a Jerry can of petrol for the wife's car and it was then I noticed the problem. When I opened the fuel taps, there was full free flow for a few seconds and then it weakened to a dribble. Close the taps, wait a few minutes and try again and it did exactly the same ! All our static tests (does it get good fuel flow?) showed it was fine but as soon as you left it for a few minutes, the fuel flow almost stopped. Turns out the rubber seal in both taps had swollen. The process of closing the tap squeezed the rubber into the right shape, so when it was opened the hole was full size. After a while the rubber swelled up again and blocked off the hole. Close the tap and that action squeezed the rubber back into shape.

A blast down the A513 this week and the bike spluttered like a bugger after a few miles, but if you opened and closed the taps a couple of times the problem disappeared.

As I said to Phil, it's good to find the problem and it's great when it's easy to fix !

So that's the racing finished for this year. I need to get a new exhaust system made, because although Phil said he thought it was too quiet, the noise police said it's just legal at 103dB, and the can I added to achieve this level looks like s**t. A nice new system is needed and then I can get the engine properly jetted.
 

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Andy whipped the tank off and to his surprise discovered the bolt holding the cam chain tensioner blade had 'disappeared'.

Should you ever happen to discover the force in the Universe that causses things like this, do please let us all know ...

Good find, tho' (y)
 
Holy moly Gareth, that fuel tap issue certainly goes into the weirdest ever problem basket. With that sorted you will finally be able to just focus on racing it, forward and upwards. A shame that you don't get to try it again this season.
 
Wow, that is some weird gremlin material there, Gareth! What a pain in the proverbial - but gratifying to have resolved it. Swelling rubber - definitely has an odour of modern fuel about it!!
 
Oh, and that gearbox thing with the false neutral between 3 and 5 .... WTF?!! You definitely need a better lever system if you can't comfortably get your foot under it - with rearsets it's easy to set up race pattern 1 up, 4 down as well. I definitely prefer it on a track (and I use it on the road now as well).
 
Oh, and that gearbox thing with the false neutral between 3 and 5 .... WTF?!! You definitely need a better lever system if you can't comfortably get your foot under it - with rearsets it's easy to set up race pattern 1 up, 4 down as well. I definitely prefer it on a track (and I use it on the road now as well).
When Phil Todd came over and I said I was struggling with gear change, before I told him the details he said "oh yes, they sometimes have problems between 3 and 4 or 4 and 5" and then proceeded to show me how to fix the issue. Laverda experts are worth their weight in gold. Thanks Phil.
 
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