OSSA

Hi all, just stripping down a 1972/3 MAR and was wondering if anyone could tell me the serial number for the bearings. I`ve found the number for the steering head bearings (30204) but can`t seem to find any for the wheels. Also are the hubs supposed to be black?The bike is 99% original and the spokes don`t appear to have any overspray. All the bikes I`ve seen have alloy/silver hubs but mine are black! Cheers in advance, basketcase.

im looking at changing my bike soon i have a monty 315 i love the look of the 280 how is it to ride

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

Ossa have released a press statement and a new video of Colmer riding the bike. With all the investment they are making production starts in September and they anticipate selling 1,250 bikes this year, then 2,500 in 2011. It would be good to see them in the WTC. Let's play fantasy trials riders. Who do you think they will have as their top rider?

Hi there, First time using the forum and I’m looking for a bit of help with my Ossa. My dad and I acquired it many years ago and it was our intention to get it back to working order and maybe use it for the odd trial. My dad passed away before we got round to it so now I’m going to have a go myself. My dad was an engineer and knew the history of the bike. I’m ok with routine maintainance and minor repairs having owned modern MX bikes but have never done a restoration on a classic so it’s a bit beyond my experience/ skills. The bike is currently dismantled in boxes etc and has been like this for years im probably going to get the engine rebuilt profes…

Curious about opinions regarding front sprockets sizes and how they effect the selection of gears. Stock, my MAR had a 12 on the front. I have ridden the 12 since I finished getting the bike going. I see that 10 tooth and 11 tooth are available. Today I removed the 12 and installed an 11. After riding around the yard a bit, the 11 certainly is capable of being very controlled at low idling speed in first gear. So with first being lower so is second, Second currently with the 11 feels about a bit taller than first with the 12. Does the 10 tooth make second gear about the same as first gear with the original 12 tooth? Curious what others run a…

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, 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…

super happy with my explorer !

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.

Any news about the OSSA explorer in Europe? It wont be in North America until June. Just wondering if its out in Europe now, if any reviews, videos, etc. I have seen the CAD renderings, a few of the photos from the OSSA site, the various magazine articles based on the product literature. I am quite interested in this bike, as it is trials based, very light and they will try to make it street legal in north america. Thanks

I am just installing the updated shifter drum and new shift assembly into my 2012 - this will allow for easy finding of neutral and a little bit more strength in shifting. My question is about drilling an oil transfer hole. In the attached picture I mark two areas that are at the lowest portion of the tranny plate. Should I drill at A or B? What size hole? Oh, and should I use any thread locker on the tranny bolts? I used blue locktite last time and I nearly stripped a couple of them getting them out this time. (Torx T10 - sheesh - give me a break?!?!?) thanks

Hi All I am currently looking at an Ossa to buy, it's in pieces. Firstly I can not find a frame number. I'm told the frame is a 1972 Model. Please what is the location? I have two area's of concern. Is the skid plate available anywhere? On the off chance the magneto is no good. What are my opions and how much. Cheers

Looking for tips and tricks for 2010-2015 Ossa TR’s. I just bought a 2015 TR250I and am in the process of going through it, replacing worn out parts. Thanks to a local parts supplier, so far it’s going pretty good. Biggest issue I’ve ran into was the silencer had a broken bolt stuck in the aluminum and a broken bracket on top for a clip type nut.

Looks as if the new Ossa is being tested in Italy, see report from http://www.mototrial.it/

Hi folks, currently stripping my 250 gripper engine.. quick question about removing the crank, there appears to be a washer needing removed in order to pull the crank from the case.. does this simply pull off as it seems quite tight, hope this makes sense? Pic attached of said washer. Cheers John.

anyone managed to get a set of these diagnostic leads from Btwice yet? an if so, how are they, do they work as planned? Also, anyone have one of the Btwice adjustable throttle bodies, same question, how are they and do they work as planned?

What do people think of the latest ossa mapping? map 13

I'm contemplating buying a 2012 tr280i, but am concerned about the spares situation now that the factory is closed. I spoke to a chap at Trials & Tribulations who was very gloomy and basically told me not to touch it. Birketts are currently closed so can't ask them. Does anyone have any views or advice? Thanks