Dellorto carb spring lengths

  • Thread starter Thread starter Reggie3cl
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Reggie3cl

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OK, so I'm a limp wristed gay 120 rider, but the throttle is too heavy.  I think my springs have been cut down, but by how much I know not.

How long are they as standard? 
 
Hey reggie, your sig reminds me of something I have meant to ask you for a while. Do you know if anyone has done an IBA on a Laverda? Did mine on the K11, but would like to do one on the RGS. Fuel consumption might be a stumbling block ie too many fuel stops.

 
There was an RGS in the first Cannon Ball Run in the USA.I would assume they would be well suited with maybe a fuel bladder strapped in the back.Some of the Scots were talking about this stuff a while ago.
 
A couple other things to check are the condition of your throttle cable and if the accelerator pump membranes have hardened. 20 or 30 years of use and gas fumes will do them in. With new ones you don't feel the ramp when the slides go up. They're still available and it's a breeze to change them. I've had several throttle cables that felt fine off of the bike but then would become heavy when re-installed and actually had tension on them. I'm guessing the inner cable had worn through the nylon at the metal bend at the twist grip. Now I just periodically replace them and keep an old one somewhere on each bike as a spare. Add all of this together with shortened springs, as Piet said, you'll actually have something pleasant to use.

Tom
 
Tom:  Interesting, I'll check out the diaphragms.

Drikko: George Swetland took part in and indeed finished the first Iron Butt Rally (not Cannonball) on a new, bog standard RGS.  The original Iron Butt is similar only in name to the modern event- the original Iron Butt was much more a race with cash prizes around the States than the modern version.  It was actually too easy- if doing a lap of the US in one hit could ever be considered easy- and I think all of the entrants finished, which screwed up the prize element somewhat.

If you were doing one of the actual organised rallies then an extended range tank might be useful, but for the basic Saddlesore 1000 that would not be necessary.

I would say for the full on Iron Butt which requires you to ride about 1000 miles per day for 11 days or so your big problem would be changing the oil often enough!  Having said that, the last full IBA rally was completed by an English guy on a Trident (he just rode the basic course) so it could be done.

I fully intend to do another IBA sanctioned run, this time on the RGS, but not until I've had a peek inside the motor...
 
It was a saddlesore 1000 you did, wasn't it? If my memory serves you wrote it up here (or was it in LVV?)

Like winter rallies (& the Lairig Ghru) it's one of the things I keep saying I should do sometime.

can't see it being this year right enough, but maybe next year.

This year I'll be well happy if I can manage the Scottish

Bob
 
Its easy to tell if they have been shortened. They won't have the full ring turn on the end.

125mm or thereabouts.

Come in 3 tensions for the PHF/PHM/PHB. I got a light set from MG cycle in the US, I think from memory.

Guzzis all came with the hard. Don't know about other makes that used them.

HTH.

Rod
 
Yeah, that's how I knew.  Mine are 100mm, so as short as I'd want.  Pump diaphragms to look at next, then.
 
Richard,

Had real bad cramp from my tommacrappy quick action throttle which came with the bike,looked at springs- standard,put on a Suzuki throttle from Slaters,new cables and its fine,

LJ
 
Checked the diphragms today- seem OK.  Have reinstalled the carbs paying particuler attention to the cable run- cable lubed, think it's better but not brilliant.  Always found the pull too much on the 180 too, guess I really am a limp wristed gay... :D

Funny, I have nothing against Dellortos per se- they worked a treat on my Guzzi Sport 1100, no glitches at all but the just aren't much good on Lavs IMHO.  Wonder if they work better with a better cylinder head like a Corsa one?
 
The track that the nylon pump arm runs in (in the slide) usually gets mucked up with a mix of alloy dust and oil. Also what about the bore in the carb body where the diaphragm piston passes through? Any crud there and it will affect the throttle pull. I was amazed how much crud came out of the carbs after an ultrasonic clean.
 
Yeah, there was quite a lot of crud in the slot in the slide, which I cleaned out.  The plungers for the diaphragms moved pretty easy, but to be honest I'll just live with it- I think I've cured the main problem which was a poor response off idle, and the action is a little better.

Now if it would just stop raining and warm up a bit I might feel like going out and using the bloody thing.
 
Reggie,
How about the condition of the twist grip itself and the housing it sits in? Is it fouling on the bars or the housing.

Scrumpy
 
Morizzi said:
Its easy to tell if they have been shortened. They won't have the full ring turn on the end.
Click to expand...

Not necessarily so. On the set I shortened, I put the full ring turn back on the shortened end so they'll sit square in their bores. It just takes a bit of tweaking with some pointy-nose pliers and they look as good as a bought one.  :D

Cheers,
Cam
 
How about the condition of the twist grip itself and the housing it sits in? Is it fouling on the bars or the housing.

Scrumpy
Click to expand...

Nah, it's all OK.  I think to get any significant further improvement from here I'd have to spend money on all sorts of bits and pieces for the carbs, and I'm not gonna.  She'll be OK for now.
 
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