t-shock 250 a member on here posted in the Aprilia forum that air cooled Aprilias manufacturers to owners advice was 50:1 semi-synthetic and that he ran his own bike at 55:1 using fully synthetic without problems .......use any 2 stroke oil you like the picture on the label...... it is not vitally important .....someone on here recently ran a bike with no oil at all in the tank for 2 tank fulls before it seized up so I would not be worrying too much.If you check a member called alberto on here from Italy you will find that he uses 80:1 in his aircooled motors and says he has had no problems.
nigel go and help someone and give them your advice ....your obsessed.
Correct One nou ? , i'm still running my Fantic (240-300-303-305) air cooled at 80:1 , now with Nils Duo Synt S 100% sint. without problems with pistons, cylinder wall or other.
Very important correct jet, and needle. Poor carburtion is very dangerous.
But i ride only in trial sections (zona) where the engine run always at low rpm, sure i if ride my bike in mountain with long climb and hot temperature i put more oil in the mix, but always less than 50:1 with sint oil.
Hi Luke7129 standard 301 Fantic Carb settings are : Dellorto PHBH 26 BS
Main Jet 102
Pilot Jet 45
Needle X5 2nd notch
Slide 45
Air Screw 1 Turn out, dont forget, with Air screw its out to weaken mixture, in to richen, also standard plug is NGK B8ES, or Champion N3, hope this helps.
I know it's been ask about a hundred time, but the I don't have a lot of choice here. I recently bought a lightly use Sherco St 250 2015, I really like the feel of the clutch. Now I have to change the oil in the gear box, unfortunately, I don't know and can't find what is in the gearbox. I have avalable Motul Gear 300 SAE75W90 100% synt oil. Any comments on that?
Guy
i think you can put in your bike, it's an high protection gear oil, i have used in Fantic section the Motul HD 80/90 high viscosity oil (for hypoid) and it was the only oil that allow us to run without slepper cluthc problems. Yes high viscosity oil have a problem sometime in trial gearbox, the disc do not detached as well as a low viscosity oil, expecially at low temperature
I think maybe 4 x Cota 349 models, not sure of the early years but the last is known as 349/4, aka Cota 350 and MH 349 which were all '83/'84 models I believe, the 330 being the next and last big bore twin shock from Montesa in 1985.
yes it's the first 349, the second 349 red had a lower seat, then arrive the white 349
the red 349 had some problems (broken frame and gear box) and heavy to ride
in classic trial race you never see a 349 (at least in Italy)
Know the correct mix but need to get the least engine wear and hopefully reasonable amounts of smoke out the back lol,have picked non synthetic oil because oil hopefully has moved on since the late 70's ,really not a fan of synthetic oil so need an answer from folks that have been running the "right" mixture for a while,was thinking 1:30...comments please.
As an aside it have exhaust off and not a mark on the piston,and same on the inlet side,want to keep it that way.
Cheers Dean.
I ride my old Fantics at 80:1 in trial classic competition with sint oil, sure 50:1 with sint oil is ready for a motocross bike, if you ride your bike for trial (always low rpm) you don't need a lot of oil in mix, if you ride your engine quite fast (enduro style) you need more oil
more oil mean more deposit on ring (sometime blocked) exaust and silencer so i think it's very important know how you ride your engine
which type and brand of oil you can find in your country ?
i suggest you to check the frame (front) always broke, and keep attention to the gearbox, sometime in neutral ( when the engine run) it start .... without touch the lever
With hindsight why did they make the 300 so heavy ?
the 300 was a mistake, Fantic need a new bike but the designer of the 240 was old and he retired, so the 300 born in run, after a few months they just tried 301 prototype
Cheers for that, I must be thick but where do you drain and top up the Gearbox and clutch levels? There's only one plastic filling plug in the clutch cover side and one drain plug below this side of the engine.
i think the cota 123/200 has only 1 gear box oil, so go to 10w30 or 10w40 or atf
cota 348/349 has two different type of oil, separate: 80/90 in gearbox and 10/30 in clutch
Correct. 50:1 is fine for the old Spanish bikes these days.
we raced with the Cota 123 for two year in the 1982-1983 (italian national junior championship) at 60:1 with sinthetic oil (Bel Ray MC1) and after 6 month of race, our trial mechanic check the engine and discover that there wasn't any particular problem (piston tollerance and connecting rod) but a lot of deposit on piston and rings, so he told us to reduce the oil into the premix at 80:1, then we raced all the rest of the time at 80:1 with racing sinthetic oil.
.
Svm
in SWM
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