OSSA

My 2011 tr280i is an awesome bike.The only negatve thing about it is it's reluctance to start as easily as other brands are.It's a lot better with the 9v kit and the proper mapping and tuning,but it's still not as good as it could be imho. Has anyone ever entertained the idea of putting another base gasket in it to lower compression? (i know it would be a lot of work and another tuning session) The motor has power that a world class rider is capable of using.I don't fill those shoes.

Don't know where I've been the last year that I haven't seen this machine ! I guess UNDER a log Anyway , I am VERY interested in buying one for my next bike ,like in a couple months. I am used to FI , we have been running it on our MX bikes and race quads since about 2002 Is there any way an individual can remap this bike? No dealer anywhere close , maybe 300 miles. What is the parts avail in the US ? How has the reliability been? Anything else I need to know?

I've got a new to me 2015 Tr250. I know absolutely nothing about these bikes. Is there any good resources? Any knowledge you care to share is appreciated (I could not even find the fuel on/off valve!) okay I'm off to see if I can find an owners manual online.

Anyone knows of an engine block for sale? The owner before me "forgott" to tell me aboute a crack in the engine..... Sold the bike a couple of weeks ago and the new owner found out,he was not happy. I´ll try to help him out with the problem. I have emailed joa hindren and trials and tribulations but no answer yet. Regards Christian Sweden

I have a 72 OSSA MAR. I just got it and it ran pretty good. I knew I was going to slosh the gas tank but thought I could run it a bit before the slosh came in the mail, etc. In short, I ran it one weekend and the throttle was sticking pretty bad so I knew it was time. I sloshed the tank with Caswell epoxy coating and while the slosh was setting up (total bike sat was two weeks) I cleaned the carb which had lots of fiberglass goo but is now spotless. Also the plug had a thin fiberglass film baked on. Now new plug, clean carb and it won't even cough. Before it at least tried to start first kick. Do you think that goo is causing some problem with the rings or what. …

My original IRZ is working just fine and with very low miles I decided to try replace it before wearing it out further. I purchased a Taiwan made OKO kit from Mid-Atlantic trials (I am in the states) and wonder if any of you had gone this route? The tuning seems straight-forward.

Is it possible to fit an electronic ignition to a 1975 Ossa 250 MAR? If so where can I get one ? Failing that has anybody got a points ignition set in good condition that I could buy? I'm based in England . TIA

Hi, I recently bought a 2011 tr280i. The bike looks in good condition but seems to shift into gear by itself while the engine is running. So I'm trying to pull the gearbox out to inspect. I got the five bolts out and have it in gear but it just doesn't seem to move with a tap on the output shaft. It seems like the clutch shaft is jammed somehow. It doesn't have a clutch fixer nut because it's 2011 so I really need some advice of how to remove it. Cheers.

I've broken the original plug cap on my ossa, swapped to a normal ngk rubber one, does this make any difference, as the crap starting is even more crap!! Tried iridium plug and lithium battery, waste of time!! The button for the easy start might as well be effect only as it makes not a jot of difference. This bike is the boll@@ks but the starting is rank.... Ian

I leapt off a 1 foot bank and both the dog bone pivots (back suspension linkage) have exploded, collapsing the swingarm onto the exhaust pipe. When I have recovered my bike I shall photograph it...

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Hi! I’m just looking to buy a bike. I’ve been looking at an Ossa tr300i Factory 2013 and I would like to ask few questions about it. 1. Is it reliable? 2. Are parts easy to get? Any other information about the bike or brand is also apreciated. Thanks in advance

Well, I heard another rumor that OSSA may be back before next winter with 2018 bikes! of course, it is always 'we will see' but this one seems it could have a bit more truth than some. Anyone heard anything lately? Mark

OK are there any electronic/computer geeks out there who have an OSSA TR280? I tried to buy the cable from an ex distributor and they wanted $650CAD ($500USD) - no way. I cannot find one for sale in elsewhere. BTwice does not respond. If I know the proper communications protocol, a cable could be made up for under $40CAD, which would include the connectors to the OSSA. After hunting around I was able to find out some information: Two of the four pins on the diagnostic connector are for power. The other two are for communications. Looking at a picture of the BTWICE cable (from USB) it shows some electronics for protocol conversion, but I cannot quite…

Desperately seeking help to getting my 2013 Explorer 280i back up and running. BACKGROUND- while riding and slowly accelerating in 3rd gear bike abruptly losses power and stalls. Checked for spark- ok. Changed spark plug. Stlll no start. Disconnected fuel line and checked fuel flow-ok. So I know I had fuel and fuel pump pressure. So I had to get the bike towed out of the trail. CURRENT DIAGNOSIS- IGNITION- Strong spark visible. If I squirt some fuel into cylinder chamber and reinstall the spark plug, it fires up and runs strong until the fuel burns off so Im assuming the entire ignition circuit is working properly. FUEL PUMP- Pressure is 50 PSI static…

My '74 Mar is really, really difficult to start from cold. Lots of kicking, plug heating and tickling it eventually fires and runs. There's no 'almost starting' - the penultimate kick is no different from the previous 20 (or 30). When it's warm it runs and ticks over fine and will re-start first time but leave it a few hours, let alone days, I'm back thinking of selling ! Current plug is an NGK BP5ES Any ideas ?

From the backgound of enduro and loads of oilchanges I thougt that a simple fork oilservice would be a pice of cake, but no! Read some helpful information but not realy a complete explination. So, went for the classic counted the clicks to max, back to fully release pressure at minus and then loosen the cap. (Drained the oil from the lowest bolt first). Did all the refilling and air bleeding but when mounting the cap, with the unusal rod stuck to the cap this drives the rod to bottom?!! Leaving no chance of changing the clicks? Do I have to mount cap/rod at max + so that I later can loosen the compression nut to right set of clicks? And what is the standard set of c…

.I am the owner of a 2011 Ossa tr280i in Ontario Canada.It has the original rear hub bushing/bearing setup and it is need of a new bushing. I believe the skf # is "pcmf 353916 e".I know that there was a kit available at one time to convert the hub to bearing/bearings with a new pair of spacers.Does anyone know where i can obtain them? I tried local bearing suppliers,but they have a minimum order of $255. Thanks,Ric

So I assume by now that most people who are experiencing starting issues either have the original LSS type starter pack installed, or have the 9v battery version which is smaller, simpler, and avoids potential flooding by only charging the electrics and not the fuel pump. Just as a matter of interest, if you were to use a rechargeable 9v battery on the 9v system, and say, kept the circuit open when travelling between sections, would the system recharge the battery or would the combo capacitor and 9v battery in the sytem have a negative effect. I know changing a standard 9v battery on this system is no big deal, my questions is more just a matter of interest as to whethe…

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.