Jota 120 info please

Tigerville

New member
Location
Norwich
Hello everyone, I've just joined this excellent looking form. I am looking at a 1982 Jota 120 at the weekend. I am not familiar with the 120s but I like the idea of the Trident style firing order, smoothness and amazing exhaust note. Can anyone give me any suggestions of things to look out for when viewing? The bike has done around 25000 miles and has, so I'm told, been well maintained.

Are there any known issues to be aware of? And how do the 120s compare to the 180s? This one has got the 4C cams and high comp pistons. Thanks in advance for any tips and opinions.
 
That's Piets saying. 180s feel fast, 120 are fast is I think how it goes. I have had a couple of rides on both a 120 Jota and an RGS. You could feel the Laverda heritage whatever that is in them, for want of a better description both felt more civilised than my 180 and they should considering motorcycle engineering moves really fast with 10 years more development. But being an uncouth Barbarian I still prefer my 3c 180.
 
A tidy bike on the outside doesn’t always mean a tidy bike on the inside. Mechanical soundness is more important that what it looks like, although if you manage to find a bike with both bits good, and you like it, buy it and enjoy it.
 
Thanks for the responses so far. I'm happy to forget the 'what's the difference between 120s and 180s' question, but seriously, what kinds of things tend to go wrong with one of these after 40 years? Ignition has been mentioned and I'll check whether this has already been changed (which are good replacement systems? I thought by 1982 it would have come with a Denso system, not a Bosch? Are the Denso systems OK?). Also, I;ve seen several for sale (mostly 180s) which have had quite serious engine overhaul work done such as rebores, valve guides etc - do these tend to get through such things at a fairly rapid rate?

Oil filtration etc - I've read that the oil has to be changed every 1500 miles, and that they only have a screen rather than a paper element filter.
 
120 Jota is like riding a GPZ900r if that helps plenty of torque and revs until your hand can’t turn any more - it helps if you are taller as they ( and the 180 ) have a high centre of gravity compared to an RGS for example - these bikes like oil changes as most only have a strainer in the bottom of the sump - valves clearances every 6k need checking when you get it ! Original suspension will need an upgrade unless you are happy with a bit of bouncing around - maintenance marginally easier on a 120 than the 180 which is a totally difference experience except for the handling which should be similar - ignition as stated above can be touchy ! It will be 40 odd years old so take that into account
 
Ask to see evidence of regular servicing and any mechanical work - as you've said, it's 40 years old and, if it's been used as intended, there should be records of what's been done and by whom.
They do like to be used though - my RGS (similar motor) has done 155000km and is still on original valves, pistons, rings etc. - and there are others with similar and better provenance.
I always find that you can tell a lot from a face to face chat with the owner - you'll soon know whether he's genuine and hence how he's ridden and maintained it, why he's selling it, etc.
Ask away though - lots of knowledge (and a blend of humour....) on here 👍🏍😁
 
dont take too much into account of the "must change oil" and "must change chains" details, it is likley that the oil and chain makers gave massive discounts to Moto Laverda in order to have have that printed in the handbooks and everywhere else, I do maintenance in a serious form on an anual basis, there is usually one big trip for me every year on TOG these days, so about a month before (never the last few days) I go into servicing mode and check most things, usually very little needs doing, last year I did have to change one valve shim, the first for about six or seven years, the chains are of unknown mileage simply because I dont do such recording, I am not fussy with the oil as long as its diesel suitable and 20/50, I (might) change it once more in the year during a mini service, I once very critically compared a new triplex primary chain with the used one which was decades old and something like 40 to 50,000 miles of use, there was almost no discernable change in length and this was done to laboratory standards.The last big trip I did was August 2022, and rode from Knockholt Kent to almost the furthest tip of Denmark for their clubs 40th anniversarry, she did three 500 mile days, and one 700 mile day and a couple of lacal trip type days, over the weekend and never missed a beat, getting close to 40MPG with top (cruising) speed limited to 90MPH but usually around 80MPH. She was at one time known for blowing up and was repaired by a well known dealer about three times as I simply had no time due to work commitments, she blew again and this time I wanted to be sure I knew what the problem was,. It was a very hard to find ignition fault on each of the two boxes, one was not advancing enough, only to about 16 degrees and the other not advancing at all, just duff electrics, people from all over the word were donating ignition boxes to me and I eventually found two that were good, they are still on the bike, but to get going and provide a test bed I built an engine/gearbox entirely from used spares, the only new things in the motor were piston rings, valve springs and a seal/gasket kit, she is still running the same motor 12 years later, but getting a bit tired now, the long and the short of it is, if this bike rides and runs well, then buy it, cosmetics are cheap bearings are not.TOG has more than 250,000 kilometres showing on the three speedos she has worn (crash damage dictating replacement) I did not buy her new but it was very close (and a grand cheaper) my pride and joy for 43 years. (I have three others and at one thime owned 16)
CLEM
 
dont take too much into account of the "must change oil" and "must change chains" details, it is likley that the oil and chain makers gave massive discounts to Moto Laverda in order to have have that printed in the handbooks and everywhere else, I do maintenance in a serious form on an anual basis, there is usually one big trip for me every year on TOG these days, so about a month before (never the last few days) I go into servicing mode and check most things, usually very little needs doing, last year I did have to change one valve shim, the first for about six or seven years, the chains are of unknown mileage simply because I dont do such recording, I am not fussy with the oil as long as its diesel suitable and 20/50, I (might) change it once more in the year during a mini service, I once very critically compared a new triplex primary chain with the used one which was decades old and something like 40 to 50,000 miles of use, there was almost no discernable change in length and this was done to laboratory standards.The last big trip I did was August 2022, and rode from Knockholt Kent to almost the furthest tip of Denmark for their clubs 40th anniversarry, she did three 500 mile days, and one 700 mile day and a couple of lacal trip type days, over the weekend and never missed a beat, getting close to 40MPG with top (cruising) speed limited to 90MPH but usually around 80MPH. She was at one time known for blowing up and was repaired by a well known dealer about three times as I simply had no time due to work commitments, she blew again and this time I wanted to be sure I knew what the problem was,. It was a very hard to find ignition fault on each of the two boxes, one was not advancing enough, only to about 16 degrees and the other not advancing at all, just duff electrics, people from all over the word were donating ignition boxes to me and I eventually found two that were good, they are still on the bike, but to get going and provide a test bed I built an engine/gearbox entirely from used spares, the only new things in the motor were piston rings, valve springs and a seal/gasket kit, she is still running the same motor 12 years later, but getting a bit tired now, the long and the short of it is, if this bike rides and runs well, then buy it, cosmetics are cheap bearings are not.TOG has more than 250,000 kilometres showing on the three speedos she has worn (crash damage dictating replacement) I did not buy her new but it was very close (and a grand cheaper) my pride and joy for 43 years. (I have three others and at one thime owned 16)
CLEM
This is great info, thanks. I'm thinking about riding from Norwich to Istanbul via German, Hungary etc, then Istanbul via Mediterranean countries to Spain & Portugal next year. I've done 2500+ mile trips many times on my 1980 Tiger 750 without trouble but something physically larger, with more spare power and at least an equal amount of charm seems a good prospect. I missed a Slater 180 Jota for £2000 20 years ago and have kicked myself whenever I've thought about it ever since!

I had a tuned and high-geared Darmah 900SS which was a fantastic bike but it was impossible to keep within speed limits so I sold it before it cost me my licence (for £1900, in 2005, just before they started rocketing n value - another self-kicker!). If I can expect 40+mpg with a 4 1/2 gallon tank, that's fine. And if I can cover a good 2500-3000 miles on fresh oil before worrying about changing it, that's fine too.

Thanks too to others for your helpful comments. I will know a lot more about the bike after tomorrow, and I'll be back on here with what I found and any more queries.
 
The 180 engines and the 120 engines are completely different animals, that’s for sure. The 120 Jota enjoys the MK11 180 charging system. Limited to 400 unit production. But all Laverda’s are rare compared to everything except Bimota, MV, Magni, etc.
Just buy it. Knuckle dragging monkeys generally don’t tend to buy bikes like this. It’s a special machine in its own right. Ignore pro 120 guys, pro 180 guys, pro twin guys, they are all special.
Oil changes, yeah, 1000 miles. The oil is the filter.
 
From your description it sounds like the bike recently up on eBay for sale as mileage stated was 35,000kms and located in Norfolk.
Cosmetically it would best be described as shabby and I would try and corroborate documented history with condition. I’m skeptical this is genuine if it’s the same bike. The bike I’m thinking about was owned by Ronnie Graves and maintained by Ralph at Motalia. If this is the bike then maybe some members can tell you more. It does however have the original Jota 120 hump seat with the unique seat cover.
Other than the normal wear and tear items, engine rattles and smokey exhaust, pay attention to the engine rubber mounts, these may have some surface crazing but shouldn’t be cracked. The lower rear right mount often suffers from both final drive load and contamination from leaking brake fluid and engine oil. When ridden the engine should feel smooth and free of vibs. The Jota 120, in good mechanical order, is an excellent bike but don’t over pay for a bike with dubious history as it could get very expensive by the time it’s put right.
 
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