OSSA

Well, with OSSA in difficulty also Kokusan Denki (the japanese maker of OSSA's fuel injection system) name is gone, it's now bought by german Mahle corporation I see on their web page: Effective January 1, 2016, the company name of Kokusan Denki Co., Ltd. has changed into “MAHLE Electric Drives Japan Corporation” Good thing is Mahle is very good quality stuff, I've bought filters etc consumables from Mahle for my BMWs (they're OEM producer for BMW too) and really top notch quality, so I don't see it being a problem. But pity they had to change their nice sounding Jap name into some rough german "Ramstein-ish" sounding name. Anyways, just sayin', those Kokusan…

My green baby is sick and has a lot of bearing noise. I believe the top end is fine the bike has a ton of power and not a ton of time on it. Assuming it's only the lower bearings can anyone help me out and tell me what parts are needed to swap out the crank bearings? Anything else I should do / buy when in there? Best place for parts? LewisSport is out they are at SSDT for 2 wks. Input appreciated.

I am so grateful for the help I received with my gearbox I want to give something back to this forum. I'm a retired electrical engineer and a hobbyist machinist. I have done a fair amount of work reverse-engineering the TR280i's electrical system. Cheers. I have replaced the .PDF file with an entire website: https://www.ossa-efi.com/home It corrects some errors and omissions as well as providing greatly increased technical content.

I have seen new OSSA dealership announcements and rumors online regarding who it will be, but still no specific mention of who the US OSSA importer is and the status of bike availability. Anyone know who the importer is, or are we in double secret probation.

Hello everyone. I have the kscan software, but not the diagnostic cable. Does anyone know which cables go to every color in the control unit ? Has anyone made a cable as btwice? Thanks in advance.

Hi there current OSSA Owners. I'm struggling with the decision to buy a little OSSA explorer...I test drove it, loved it, but have been advised by many against buying an OSSA. I'm trying to figure out how much of the negativity (i.e chews through gear box) is still lagging from the 2011/2012 issues and if folks that own newer (2013/2014) bikes still have problems. Truth is, if OSSA was still in business, I would possible even buy it with the transmission issue, I though it was one of the smoothest powered trials moto's I have been on (owned a Gas Gas 300, named the devil, a beta Rev 3 2003 and we also have a 2015 beta evo 200)....a bit difficult to start when …

I keep hearing it spoken both ways, what one is correct?

Anyone know where I can find one of these clutch case breathers from in the uk or North America? http://trialparts-shop.de/produkt/ossa-motorentlueftung/

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

Hello everyone, I'm Matteo from Italy, I have a Ossa tr 280 of 2012, the bike is fine but I have a couple of problems to solve unfortunately in Italy there is nothing and there are no active forums, I need help I would need the kscan program and the explanation on how to build the connection cable in Italy it costs around 550 $ and the program is not found. can someone help me? I should also connect the front LED headlight but I do not have the switch on the handlebars, what are the cables to connect? I will put a hidden switch I apologize if my english is not perfect thanks a lot to everyone

Come on then, what's your best guess? Mine's SSDT 2011.

I've got an Ossa MAR with a lovely alloy tank which has been little used. I bought it about 10 years ago completely disassembled (everything including the engine, gearbox, rims and spokes - everything to it's last component). I put it together very carefully and had everything either polished, powdercoated and replaced with stainless. I don't remember much of the detail, but am now trying to get it finished. The engine is installed in the frame but moving the gear lever up or down does not select a gear and does not seem to engage with anything. Two questions: Am I going to have to take it all to pieces to get at the gear selectors and Contrary to my exp…

My 250 almost always requires 2 kicks. If I stop and immediately restart, 1 kick will usually do. But if it's stopped long enough to walk a section, it will probably require 2 kicks to restart. One the other hand, if the bike has been sitting for months it may start on a single kick. My 280 is somewhat more recalcitrant. It probably takes an average of 2.5 kicks. I have some theories as to why this might be so, but I'm wondering if others have managed to make theirs a 1-kick starter. This really doesn't matter during practice or if ridden as a trail bike, but during a competition it saps my limited energy. Both bikes have Easy-Start kits. I'm a bit of a l…

I need some thinner steel wear disks for my OSSA 2013 factory 300 to get the thickness down for an easier clutch pull. If I can't find thinner plates for the OSSA clutch are they the same as a GASGAS clutch? If so what bike? I wanted one of those cool XIU adjustable rings but can not find them in stock anywhere. This leads me to another question would the XIU ring for the Gas Gas work in an OSSA? Tnx.

It died as tho i had my hand on the kill switch running in 3rd gear.Disconnected the kill switch,still no spark with new plug attached.Any ideas or known issues before i take it to Ossa Canada?

Hi TC OSSA riders, Went out Saturday for quick praccy with son on TR280 all good nice and smooth power, went great, rode trial Sunday three quarters of way through, engine got very noisy, finished ok. Fired up when back, noisy, tried later today, (Monday) noisy! went round my mechanic to ask about it, seemed a lot quieter?? He said sounds good, i rode it, but not right, i can tell!! let him have a ride he agreed, says could be loose crank end nut?? anyone shed any light on this? it seems sort of rough, not as smooth as it was, course feeling?? Never felt like it would stall before, but now does?? Ideas?? Ian

I have an OSSA that has come from Italy. It was sold as a 250 , which I beleve it to be, but today at a trial it was pointed out that as I have cutout on my fins, that it may be a 350?? The engine no. Matches the frame no. But the number doesn't show up on any of the lists I have seen. Any info in aging the bike etc would be appreciated. Or even recommended upgrades, mods etc...

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?) …

Hi does anyone know where I can buy the easy start kit from for the ossa in the uk I have been out on the bike again today sometimes it starts first or second kick then sometimes in takes forever to start, apart from that the bike is awesome??thanks in advance Lee

I have taken the time to search and read about these bikes. I recently acquired a 1973 MAR and was wondering if the center exhaust section contains or contained at one point packing material, or is it baffled, or simply a small expansion chamber? I ask on account of wanting to clean it off carbon deposits internally and externally prep it for paint.