OSSA

Hi All, Looks like i'll be splitting the engine on a 250 Mar I've just acquired. It only selects 1st and 2nd ,and I have seen a posting from scotty in 2007, which had a good reply from woody. There was no outcome posted , so wondered if anyone as come across this since. Also does the engine drop out the frame easy, looks quite tight .

super happy with my explorer !

Hi. Are these still available? Am trying to find out the cost of the factory bike. Also, who has one and what's your opinion? Thanks

Hey Guy's, Just got myself a ossa 250 MAR after spending the last 30 years riding currenty bikes (fancied a project). However, I want to trick it up for a more modern riding style (move footrests down a fraction and tighten up the steering geometry. I'm a good rider and not bothered about class entry will be riding it in what ever trial. Has anybody done it to a MAR any pics you can share. Thanks in advance. Tim

Hello all, Please excuse my "butchery" but I managed to simply remove the splined bush off the crankshaft by turning an aluminium dolly to fit inside and then gently heating up the bush with a plumbers blowtorch and then hitting dolly to remove. Looked online and there's all sorts of special tools but this work a treat.

I got a 2015 ossa explorer any idea where I could get a fuel injector? Any help is appreciated thanks in advance

Did a trial last week and while I was checking a section I left the bike ticking over. As I set off into the section the bike just bogged and cut out. I couldn`t restart the bike so I took the plug out to find it was very sooted up. This has happened before when bike was left ticking over to warm up. Even after cleaning the plug the bike is reluctant to start and needs a new plug. Is there anything I can do to reset mixture ? as it seems to run too rich.

I have recently bought an Ossa having decided I needed a project and fancy a go at twin shock trials. How do I find exact pictures of the bike, details age etc. I noted from a member earlier that the frame and engine numbers should match and date the bike. They are different but similar: B-234300 & B-231300, I didn't know if I'd miss read it but am fairly sure they are different. Can anyone help?

Here's a question for those who understand port timing - which I don't Having a few problems with gear selection set up on my '75 310 MAR. Under the bench is another 310 engine I picked up about 25 years ago. It's a later engine from a green bike. I stripped it to compare selector mechanism and set up but whilst apart I thought I'd compare porting as I'd heard that the later bikes were different. On the 75 bike, the inlet port measures 25mm top to bottom and is 25mm high in the barrel (from bottom of liner to bottom of port) On the 79 bike, the inlet port measures 20mm top to bottom and is 30mm high in the barrel On the 79 bike the port is also narrower in width but I…

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

I've rebuilt the motor and was surprised to see such a large counter weight / flywheel on the cush drive. My 1972 Mar 250 has no counter weight. Any one experimented with removing or reducing this extra weight? Looking at it it almost strikes me that it's a factory add on for those who wanted to tame the bike in the day? bike runs fine, just looking to put a bit of snap into it. this seems to be an obvious but need to get a little insight first. cheers

Engine just died on me mid section and wont start at all now.Not long since new fuel pump and throttle body so any other suggestions where to start looking much appreciated.

Anyone knows if there's a high altitude (2000-2500 meters+) EFI map available for TRi?

I'm pretty new to trials and fancy a newer bike. I really wanted a 4 stroke Beta but I just can't find one. I'm now looking at 2 strokes again. I've come across a 2013 TR280i but know nothing about them. I wouldn't even know how to identify it as a 2013 model? What's a good price for one of these and what should I be looking out for? Cheers!

Hi is there anyone on teesside I can meet up with to take a look at there wiring please I need to wire in a kill switch as mine has been removed for some reason thanks Lee

Trying to decide if I should part out or fix my 12 280i. Broke the seat and can't find a replacement except 13+ which requires new fender and graphics as well. Also broke a pin in the shift shaft which can be fixed reasonably. Would probably have $600+ in fixing. Everything else is in great condition. what do you guys suggest? how much do you think I could recoup in parts?

Disclaimer; As a newer novice rider I am painfully aware that this bike is way, way more bike than I need or can make proper use of. To be honest, I just don't care, the more I learned about it the more I felt like I had to have one. I will keep riding and I will keep getting better. I am a huge technology junkie and I really appreciate the engineering I see on this bike. You folks here seem to like them plenty, I have a few questions. This bike is supposedly a limited edition as well, does that mean anything at all or are all 'factory' models limited editions? What upgrades does the factory version have that the regular bike does not, is it lighter, how much? 300…

Well, just learned of another delay in my Ossa Factory delivery...recall on the main bearing. I'm now on near 3 months delay. So the importer is going to have to uncrate the bikes, repair, recrate, then ship to the dealer. I'm assuming another month or so...assuming the importer gets the parts quickly. So I'm getting a model '14 bike well into the 2015 year...all at a premium price...IF there are no further delays. So... 1. Is The bike worth the wait? 2. Is Ossa healthy financially...seems there have been numerous delays at the factory? The Importer has never made promises...just given me ETA's. Yet Ossa has constantly had issues in manufacturing....not exceed…

Confirmed

I use F type atf in the gear box, but every year my clutch gets very stuck. Any ideas for getting it unstuck right now and keeping it from sticking each winter would be greatly appreciated. Thanks