OSSA

friends of mine, also brought the new OSSA members ! POWERFUL ! awesome BIKE ! and also my 2012 standard bike with LSS excellent ! kisses OSSA ...... Red Bull China No. 1 trial rider geng jie testing my 2012 factory R, after tested giving ' thumb up ' !

Hi guys, After soom advise on what fuel mixture to run in my TR77 350, been a long time in coming but final got out on my bike this weekend after 30 years in boxes. i'm running it at 40:1 mixture and leaving clouds of blue smoke in my wake. Thanks Rick .

Hi all, at the moment I am riding a 250 Mar in comps. Its a great bike, does everything it should but i think its lacking that something extra in the engine department. Its on its first oversize with new piston and rings, 26 mm Mikuni and thinner head gasket. The engine pulls from nothing, but just seems to lack that sharp response when power is needed. So my first question would be, is this a characteristic of the engine? Secondly I have a 250 gripper engine sat in the corner of my shed and was wondering would I get much benefit fitting this in my Mar chassis, and would it cause me much hassle? Cheers HIGGO.

Has anyone fitted a tank breather to an OSSA TR80 cap? Thoughts and details appreciated.

Hi What is the correct timing for the stator on a 250 MAR? The flyer manual I have (250 and 175 engines) mentions "Plonker, Pioneer and Stilleto" which of these should I reference for working on a MAR? regards Gordy

Can anyone help to identify this crank which was in a box of Ossa MAR bits. Seems different and a lot smaller to the MAR & TR I've got. Any info appreciated.

I am restoring my Ossa Tr77 250 and would like to keep it original as far as is possible. As far as I can tell the frame still has the original finish albeit rusty in places, the Ossa silver vehicle type sticker is still on the headstock along with the stamped frame number, so I am reasonably sure it has never been repainted.The build date on the sticker is May 77 and the frame is a light grey almost metallic with the tank and side panels being the usual green. Has anyone come across this colour combination before? most bikes on the forum/internet etc from this era seem to have black or green frames. I would be interested if the light grey/green is a combination that any…

does anybody have info about how the damper assembly goes together on these forks as at the moment its just a box of bits.

Please inform me how to add crankcase oil and how do I check the oil level? Thanks.

Hi, does anyone know where I can get the k-scan software and lead for my Ossa TR280i.

Hello, I'm a noob to the forum, having just bought an Explorer. It needs some work, nothing dramatic, just fork seals and wheel bearings... oh, and a cylinder head to replace the cracked original... all which are in-hand. I've not ridden it much yet, but already it's a bit obvious the suspension lacks refinement. What I'd really like to do is replace everything with the TR280i kit, but parts seem almost as elusive as rocking-horse poop. Is anyone breaking a TR or have a shock and forks they're willing to part with? Thanks in advance. Cheers... Paul

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

My OSSA dealer gave me both stock 5-degree and an "experimental" 15-degree butterfly along with Btwice throttle body. Looks really interesting: 15-degree butterfly is oval with angled edges and thus starts from more off-angle position and regulates the air flow in a more "progressive" fashion vs stock. I wonder with TPS having larger starting angle yet the engine gets less air (= theorethically richer mixture on low-rpms as it gets more rapidly leaner when opening up the throttle) if it improves bottom end delivery as well? Anyone has Btwice throttle body and experimented with a 15 degree butterfly? Is it worth experimenting with different custom EFI maps or i…

Hi Just seeing if anyone can tell me what grade or type of engine oil I should put in my Ossa TR77 Verde 250 1979. I’m fitting new clutch plates tomorrow that are coming from inmotion but just wanted to make sure on the oil before refill etc. I have tried to look in to this but it seems to be mixed reviews on what should be used.

Now my TR 280i is up to full running order I’ve been using it. I’m getting 75 mins to a tank. Does this sound right? Seems a thirsty beast to me but my last bike was a frugal rev3 200.

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

Hi Folks! My Explorer ran out of fuel on a 10mile road trip at about 45mph. After hearing a strange sound I immediately pulled the clutch and the engine stopped. After refueling I noticed that compression is lower than it was before but still present. I am worried that the piston seized as the engine doesn't start any more. Any ideas what I can look at before I start dismantling the whole engine? Thanks! Felix

Anyone know the piston to cylinder wall clearance spec? The ring end gap as well.Searched everywhere and can't find it.CVTech in Quebec needs the numbers to redo the nikasil liner.

Chris has just bought a Tr300i and wants to replace the Footpegs. We usually Use S3 Hard Rocks but they don't seem to fit and will not flip up due to the Fingers on the bottom of the rest. Talons look right but has anybody used anything else?

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