OSSA

So I got the Btwice flyweel kit and started to fit it but stumbled on two issues: 1) while nice kit there are no fixing bolts included (kit only comes with the weight and the cranckase extender shim) 2) Original gear shifter doesn't fit with extended crankcase size (it's against the magneto door and you can only shift downwards, upward's it's stuck against the door) How did you overcome those two issues: What bolts did you use to fix the weight on magneto w/o it going out of balance? Did you have to remove the magneto to fix it (manual states some special tool needed for this, can it be done without the special tool?) …

A riding partner of mine has acquired a pristine condition 250 Gripper and it appears to be near museum quality. Lucky him! He's unsure about a couple of things, however. He wants the bike to be as close to original as possible. He's seen photos of 81 250's with either orange or unpainted bars. Same for the chain guard. Both his bars and guard are unpainted. Did a mid year production switch happen? Also. the stock shocks are Telesco brand. Are those stock and are they rebuildable? Thanks for any advice, info, or guidance.

Anyone thought of studding their tyres on their TR-series for some more serious winter fun? I have many frozen lakes around for sliding practice, plus my own garden to play, both are very icy and slippery during the winter. With stock trails tyres it's too much slipping, especially the front end. So I though studding the tyres. Anyone done this on a trails bike? I see many kits around - screw-in type of studs. I guess the problem is the rear since it's tubless (albeit tube can be fit there too I reckon).

My TR280i came with those short custom made levers installed by the previous owner: I really like the feel on them and after also doing some research those are very custom made levers made by Finnish premium manufacturer, you can't even buy them anywhere (special order only). Aside from very good feel what I really like about them is they don't pressure all of my fingers like the normal long levers do (and especially annoying and loss of feel when the lever messing with my wedding ring, but with those Take-Pajas are perfectly designed for 1 or 2 finger use without touching the third or forth when pushed down) But makes me a…

It's for the earlier OSSA fuel-injected models that tend to be hard to start. Since the original thread is 24 pages and very hard to follow and confusing OSSAs own easy-start mod with various DIY mods or tweaks, here I'll put down a simple DIY mod into a single thread: You need: - 9V battery - 9V battery holder or connector - switch (or even better if a Yamaha-type kill-switch) - little bit of light wiring (some 5-10 inches total or a little more if you route to handlebar killswitch) - some longer straps to fix the battery (and for the switch if you don't use kill-switch) And a mandatory very important note to any DIY mod: DO THIS AT YOUR OWN RISK! (and ma…

Anybody know which wire is grounded to earth via a kill switch on an MAR ?

On the OSSA MAR / TR77 brake pedal cross shaft where the chain tensioner pivots a pin is required, should this be a roll pin or something else maybe with a head to secure the chain tensioner spring? Can the rear brake pedal be installed and removed with the engine in the frame. Never having previously owned an OSSA and starting with a basically good but partially dismantled bike the reassembly raises a few questions so any assembly hints and tips you have will be welcome. Thank you all.

Bump stop is trashed on 280i Ohlins, does anyone know where i can get one from? get it sorted? the shock on later models seem a solid black rubber one? this one seems tan colour and softer? Can we put new one on without stripping shock ?

Hi Been having some issues with the mixture on mine, plug is always sooty black, went through new plug in a trials and a practice today, saw that the TPS was loose too, anyone know of somone in the leicester area that can reset the tps and have a fiddle with the mixture? i have had a google but couldnt see any trials mechanics in leicester at all but them i am not the best at googling. I do plod around on the easy routes so i dont make the bike work as hard as it could, i cleared it out with a quick 4th gear full throttle blast and it smoked like hell for a while. that did make it a little happier but then wouldnt idle, cleaned the plug and its all lovely aga…

What length shock should I go for on the rear ? 360mm or 400mm ? I'm 6'1" tall and 13st Would 40lb springs be correct ?

hI can anyone tell me the colour code or a close match for the White tank and side panels please for a mkii.And also is the rear mudgaurd supposed to be full length or are the shorter gonelli type guards correct Many thanks

Has anyone relocated their foot pegs whilst retaining the original mount ? Or does this need cutting off, and the new mounts welding on ? Either way, photos would be great

Hi all. Got my engine back from Steve Sell recently. Sent to him as I wanted gearbox sorting. New rod kit, all bearings, small end etc. New rings, piston (std) and bore OK. Have obviously had barrel off to put engine in frame, new gaskets. Have pulled down again to check rings, all good. Jetting and fuel mixture make no difference to noise. Bike pulls well, all of the exhaust is new, runs nice at walking pace and pulls fine. So is this just a normal Ossa thing? Video below

Has anyone else seen the ossa on fleabay? I think someone's going to get well and truly lumbered with that as James only paid £1500 the year before, oops!

What number of teeth is the best combination when trialling the mar?

Gents, can anyone recognize this Ossa front hub in the top pic? 122mm dia. Please note that there is no groove around the outside the brake liner. (Other 122mm Ossa super pioneer hubs I have have such a groove - as in bottom pic) Perhaps a Mk1 MAR ?? cheers

Is this for reducing / increasing clutch pull? I've been having some issues with arm pump during long practice sessions would like to reduce the pull of my clutch a bit as my Ossa's pull is about 2x that of my Sherco. I'm a novice rider and won't be doing any 4th gear splats for some time I imagine... Anyone know anything about this? Seems like a new part.

hI all does anyone know if you can buy aftermarket clamps for the ossa or very similar,If finding a decent second hand pair,mine have a bit of corrosion coming in them when I cleaned them so don't particularly want to use them. Many thanks

I'm trying to tune a Keihin carb for my Ossa 250 Gripper. I don't have any experience with these modern carbs, so it's being complicated. Can anybody give me a good starting point for its settings? If I'm not wrong, OKO jets are also valid for my Keihin. Thanks in advance.

Are the OSSA spokes the same as any other make of bike ? Otherwise where is the cheapest place to get spokes and nipples ?