OSSA

I have a customer 2012 Explorer (with fixer nut). It was stuck in 6th, I popped out the gearbox and found a broken gear. 6th drive gear tooth/engagement dog if I have it right. It appears on 6th the teeth just extend out to make an engagement dog. Not very thick there so seems a weak spot? But I always tell people to shift this slowly and gently and they will last great. Start ‘jamming gears’ like an enduro bike and you could probably break it in an hour. I had almost 400 hours on my Explorer (just sold it)- only gearbox issue was a broken return spring. Edit: Dang, I forgot the original reason for post. Who has gearbox parts? I have a call into Lewi…

my new toy the new first 2012 Ossa TR280i in China, Hong Kong and Macau regions super nice bike !

Having a little trouble identifying this ossa, I`ve seen some pics of other canti-lever bikes but none have the bend in the seat stay above the brake cable stop. I`ts obviously recently had some restoration work and I`m hoping to find out who did the work and hopefully trace its history. I bought it in Leeds and the seats been recovered by dlc so guess its a local bike. I`ve added some pics and with any luck someone might recognise the bike and help with leads. I guess it would have been registered for road use at some point and I`d like to to trace its reg through previous owners etc. i know its a rare bike so would think someone must have seen it about and I`d be grat…

I have a faulty fuel pump on my ossa and need to remove and install new part. I believe this means taking the engine out, is it at all possible to change pump without taking engine out? Also I read somewhere that a special tool is required to remove the pump, if so where are these available from? Does anyone know if the ossa fuel pumps are used in any other make bikes

Im looking into a new bike ad I was going for a montesa. I orignally looked at ossa's but heard alot of negativity about the 2011 bikes, which over shadows the good points really. ive read a few bits of topics but theres no real topic on 2012 bikes yet. is the 2012 a much better bike with all the previous problems being solved? or are there still issues that need addressing?

I'm looking for a sump guard for my Ossa. I think its a 71/72, it seems to have had rear passenger foot rest stays welded on the swing arm, I can't imagine these would be standard. I will try and attach some pictures, any feedback would be welcome. Cheers

My Ossa 280i has always had a problem with overheating and uses normally 250ml of water every time I fill the petrol tank. Up the hill trails it would boil dry if I wasn't carrying 2-3 litres of water in my rucksack and replenishing about every 15 minutes. In the SSDT it boiled out on long road sections and blew a cylinder head and melted the pump impellers etc. rebuilt by the factory and it still boils even after they flushed and refilled the cooling system. Yes, the radiator is clean and I even blew it out with an air hose and pressure washed all the dust out.. The fan works well on the thermostat, comes on as I reach the end of the field about 200m from my house, fan…

Anyone having/had a problem with there rear brake pedal ? mines been sticking on every now and then and i have pinned it down to the ball joint pin coming loose from the pedal which is allowing it to twist and catch on the frame which stops the brake from coming off fully jsp

Has anyone experience with the new fibreglass replacement petrol tanks, coming out of Spain for MAR's and TR80's? Do they stand up to the new fuels or do they have to be lined?

My OSSA 280i is close to 100 hours up after two years, which is not high usage. I change the oil religiously and keep the bike in primo order but I do notice that there's a very weird low rumbly whine coming from the left side of the crankcase when under load in taller gears. This is disconcerting and I'd like to know if its fixable? It is not present all the time but most noticeable when the torque is loaded, perhaps its the lower e=rev range which enables me to hear it, or perhaps it disappears at higher revs, Any thoughts?

Hi, In the final stages of rebuilding my MAR and need some advice on magneto's. It is road registered however it only has the 3 wire ignition only magneto. Previously there was just a battery for the lights mounted on a homemade side panel. I am wanting to keep it original so had to do away with the battery. I have been looking for a magneto/alternator all over for a few weeks now with no success. Can anyone help and point me in the right direction? Pic attached to share Thanks Mark

hi, we have a 1975 ossa 250 MAR . its nice and clean but we cant get it running. this is because the original amal carb is shot. needs a whole new carb. the current one is all scored and the float bowel does not join properly and you can see light between the gap. would like to get an after market one on it. just something that will make her run nicely. the ossa we have is where the carb bolts onto the cylinder and not into a rubber boot which some do.( apparantly this is rare?) it also has no choke and just a primer which pi****s fuel everywhere. please can someone point me in the right direction for a new one and where i can get it? many thanks!

i have wanted a new sherco for quite a while now but recently the ossa as caught my eye, i am hoping to buy a new bike in around a months time, it looks very easy to clean and i quite like the idea of the easy start, i can't afford a new one but i have seen 2012-13 in my price range so i was hoping for some honest answers on the good and the bad points, things like are spares easy to get hold of and are the spares a reasonable price, are they easy to maintain, is there well known problems that you know of.

I am restoring my Ossa 350 gripper it is nearing completion it will have lights, but i desperatelly need a wiring diagram to help, or we are stuck, please can anyone help me. paul@direct-energy.co.uk

Hey I bought this bike in spring which is my first trials bike and I love the sport but I feel that I bought the wrong bike. After a handful of rides the bike started clicking while in gear, almost as if the bike wants to shift up. Even in neutral the bike clicks if you spin the countershaft. I removed the transmission and found some gears worn down and a chip off another. I sent the transmission to lewis sport but after a handful of rides it went right back to the same problem but now when shifting it sometimes doesnt click into gear properly. you can move the shifter up and down and it normally shifts cleanly but once and a while it gets stuck and you have to shift …

Hi I have water in my gear oil. I have the water pump out. I think the bike is 2013. There is a circlip behind the drive gear which was tricky to remove. It was suggested that I change the pump seal, although the problem could be somewhere else. How do I remove the impeller? Does anyone know the seal part number? Is the seal a common part? Thanks in advance. Andy Chalkley

Does anyone have details on the correct paint code/shade for the "fat" stripe on a 1971 Ossa MAR? Thanks

I am trying to track down a bike that turned up at a Dabbers trials a couple of years ago It is a Scimitar Ossa. It was built around 1972 by Edgar Stearn nr Cambridge and was a re-framed Ossa with bespoke seat & tank. If anyone knows of it's whereabouts, it would be good to see the bike again.

Hi Anyone know the front and rear suspension travel on the TR280i 2012, need to know it when setting sag and I cant find it in the manual.

Hi, Last year I picked up a cheap 250MAR 1974/5 and promptly fell off first time out due to my own incompetence. I'm fairly new to trials but the Ossa definately did not react the same way as my Beta Rev3 when I went up a gentle bank. The result was much pain, blood, 8 stitches, more pain, then a very nasty hospital infection with lots more pain... and it also put me off work for 75 days....did I mention the pain? Anyway I'm all healed now so back to the question. Looking at the bike it appears to have been modified with shorter rear shocks fitted than standard, I hear this was a modification and standard on later bikes but I'd like to get it back to somewhere near o…