OSSA

Anyone had the misfortune to snap off the 90 degree fuel outlet elbow? If so did you manage to get the part?

My 1973 MAR has some corrosion on the flywheel and stator. With care, I have cleaned up the poles of the stator. To clean the corrosion from the flywheel I used abrasive cloth and cleaned the magnets and interior. I also used the abrasive cloth to clean the flywheel exterior. Removing the corrosion also removed whatever protective coating was there, so I ask, does anyone know what the oem finish was and what color a new flywheel would be.

Hi there guys,have just come back from my first outing on the new bike,all went well! Decided when i got home to drop the factory oil,removed the drain plug as per manual and got about 100mls out i guess,someone told me to just lay it over a touch to get the rest! HA;HA! Well i laid it right over on its side in the end,nothing until i stood it back upright then another 100 mls,so in total measured into a jug i managed to get 200mls (and it was over the sight glass from dealer). Not sure where they get 350mls from or where the rest is? I have put 250mls back and its way over the sight glass. So whats the trick to drain these suckers properly?? Peter.

A friend has imported one of these and there's a chance I might be able to pick it up from him. My riding buddy says the red 303 is a late effort hodge podge of parts and that the transmission is a time bomb. I know very little about these bikes. Is the bike a museum piece? If the tranny is fragile, are there options?

http://trialsport.se/pdf/service-specialdelar.pdf Some nice stuff.....

Been a rumble / whirring on my lads 280 for a few weeks now which has been getting worse so it's time to investigate. Has been a few bigger bits of metal than usual in the last couple of oil changes. First step is to obviously pull the box. Before doing it I have noticed there seems to be a bit of play in the clutch basket. I presume that there should be none??? Would this suggest a knackered bearing ? If not probably main bearings. Anyone priced the tools for taking the crank out?

Hi guys, I'm completely new to trials, well motorbikes full stop. There's been what I think is an Ossa MAR 250 sat in the shed for the best part of 20 years now, purchased by my old man for a tenner. As I've got a bit of time on my hands I've started taking it apart with the hope of getting it back to somewhere decent nick (never worked on a bike before but I'm a fairly competent mechanic and engineer). I haven't got as far as checking the frame and engine numbers yet to find out specifically what model it is, I was just wondering if the pattern on the tank is stock? Most of the early models have the green stripe of some sort but i recently saw one with a red stripe? Unf…

Hello ossa users, now that im a proud owner of a ossa tr280i i wonder whats the best site to get spare parts like clutch etc.... I'm from italy and the best address i found until now was nonstopmotoren.com but even there is no clutch. I wonder if there is any other branded clutch (maybe gasgas) thats compatible?

Found these pics with others from the Eicma show.

Hi, My 300 has the factory clutch, been well used and no probs with slipping etc, but i seem to be having to adjust it a lot and cannot get the right release position on lever. Its very slightly draggy, or to close to handlebar to feel correct. I know stack height on friction plates are 9.75 total, but anyone know the finger end height from centre of clutch basket? Regards, Ian

Following the issues with my mar first having an oil leak, then jumping out of gear, I have removed the oil and refilled it a couple of times. The first time I drained the remainder of the oil that hadn't already leaked out, then filled it with 900cc / ml of oil. Following a 5 min ride I left it to drain again over night. After re fitting the detent plunger I went to put the drained oil back into the bike. To my surprise there was only 600 ml in the catch tank ?????!!!!!! Where are the other 300ml ??

Hi! Just enterd the world of trials via a almost unused 280 but i have a small oil leak from a torx bolt just behind the lever. Seems to hold the gearbox somehow. Can I losen this and add new loctite without getting in trouble??

As the heading says looks like we are not allowed to pass comment on ex works bikes on Trials Central anymore? I think people were only trying to protect other Trials Central members. Thought i would just make the point before this post gets deleted as the others were. Free speach, within the boundaries of the law used to be allowed on here. Then again it's not my site so what Andy decides is Andies perogative and i have to respect that and i do. Perhaps we could have an outline of what we are and are not allowed to discuss?

Does anyone know why the ossa web site is not working

Without question everything is not rosey at ossa but ffs they finished the ssdt and (I am guessing here) emma bristow won the ladies event last weekend. then theres the cabby/raga type special called a Fajardo anyone know why its a secret? Maybe they have only just got the internet in cumbria but the pr in the uk is rubbish. Why? maybe the faults if there are any are so big they don't want to mention the bike at all but its a new bike its not going to be perfect and its streets ahead of the Sherco-greeves.

Here are a couple of shots of the bike in action. http://www.trialscentral.com/cms/showartic...?articleID=5434

If this topic has been discussed elsewhere, I could not find it. I'm curious how many bikes (and of what type) were actually produced. If the numbers are unknown, maybe we can estimate them from VINs? I think my 2011 280 was a very early arrival in the US. Its VIN ends in 165. Same with my 2014 250, its VIN ends in 35.

Bit of a stupid question, but when you put the nut securing wire on the mar clutch, do you route the wire through all 5 posts or wire them individually

http://www.ossamotor.es/EN/tr14.php

Other than the tank and seat, what is the difference between an Explorer and an MAR please (I'm thinking '75/76 here)? I fancy having a go at long distance trials and don't want to mess with my current MAR so am looking for another bike, but Explorers are rare, so it may be easier to modify an MAR if it's just bolt on parts, then I can always undo it to keep the purists (me!) happy. I've been toying with a new machine but nothing inspires me - CCM SR-40 - expensive, fragile(?), Beta Alp 4.0 - heavy, little ground clearance, Kawasaki KLX250 - a bit lightweight? I don't want an enduro style machine so have ruled out everything else, hence thinking back to an Ossa... Mike