OSSA

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.

It's looking a bit ratty and I want to do a couple of things to the bike to make it more suitable to me.the frame is going to get a black powdercoat,the triples are getting black anodizing and i'll change the airbox cover for the new style vented one.I'm going to try and see if I can get a 2015 sticker set for it if it will fit the 2011 plastics.Might have to get a newer seat base and bendy rear fender.While the engine is out,another base gasket is going in to make it easier to kick thru.I doubt it will effect low end power,but I might lose top end.Never use all of it anyway.

Hey guys, I just recently got my first trials, a 2013 TR280i. The previous owner rigged up a start assist with a 9v battery and when I went to swap for a new battery a few of the wires came apart. I am clueless when it comes to electronics so I have no idea where to even start re wiring. I tried it a couple ways and has had no luck, and now the start assist isn’t working, nor is my fan turning on. If anybody could help me figure this out it would be much appreciated.

Just bought a 2014 TR280i with an explorer conversion kit 1) how do you connect the explorer tank to fuel system 2) does anyone have the part number for the easy start system as the one supplied doesn’t look correct ? thanks

Chris has just bought a Tr300i and wants to replace the Footpegs. We usually Use S3 Hard Rocks but they don't seem to fit and will not flip up due to the Fingers on the bottom of the rest. Talons look right but has anybody used anything else?

Hi all Thanks for your help so far with my TR77 restoration. Today I got the top end on, the timing done, a spark, and most of the parts left ready to bolt on (waiting for a pushrod oilseal and the paintwork to come back). I'm sure that I'll be asking for more help, but here is the bike as of tonight. :-)

Hi again Re the Ossa clutch - how far down should the springs go, and what do you use in the holes in the end of the threaded adjuster pegs? Is just wiring them up OK? Also, what is this bit? I'm guessing from the bolt length it fits on the timing cover casing - the top bolt by the clutch arm? If so, why? If not - where and why? This has got me puzzled I must say. Thanks Adrian

Hi all - yup, me again I just got my petrol tank back from the painters - and its oh SO nice! What a lovely paint job. The paint shop is in Ware, East Herts if you want anything painting. It's a great place :-) Anyway, I have the rubbers for the frame lugs that the front of the tank rests on, but what's at the other end? There is a rounded bracket at the back of the tank that seems to sit snug on the top frame tube, but should there be something under this? Is there supposed to be a rubber or something under the tank? Should finally have it running and fired up this week - for the first time in over 16 years. Yay! :-) Adrian

I'm restoring a TR77 from a box of bits and after cleaning up the crankcases I found cracks on both sides where the cylinder studs go in. Is this a common problem or have the studs been tightened up by a Gorilla with a 10 foot long wrench? Work to do :-(

Hi folks - Adrian again here with my basket case Ossa! So I went to put the clutch mechanism onto the shaft. Behind the clutch are a thrust washer and a spacer according to my Clymer manual. As always with a basket case like this - I don't have these parts, or if I do - I don't recognise them amongst boxes of irrelevant non-Ossa parts, machine tool bits and bobs, random stuff etc... I have a thrust washer that fits on the shaft nicely, but how thick should it be, and what about the outside diameter? I have no idea as to the size of the spacer, but I assume it is wide enough to ensure that the inner sleeve of the needle roller bearing is just proud of the clutc…

I am restoring my Ossa Tr77 250 and would like to keep it original as far as is possible. As far as I can tell the frame still has the original finish albeit rusty in places, the Ossa silver vehicle type sticker is still on the headstock along with the stamped frame number, so I am reasonably sure it has never been repainted.The build date on the sticker is May 77 and the frame is a light grey almost metallic with the tank and side panels being the usual green. Has anyone come across this colour combination before? most bikes on the forum/internet etc from this era seem to have black or green frames. I would be interested if the light grey/green is a combination that any…

Hi all I'm restoring a TR77 that I got as a box of bits. Attached is a photo of my old front sprocket, and the new one supplied by InMotion. The InMotion one is much wider, and if I fit it, the sprocket nut sticks off the end of the shaft and is almost touching the outer casing. The thinner older one fits perfectly. InMotion told me that they only sell the wide one for Ossas and this is the correct one. Is the TR77 different to the MARs? Any ideas why this is wrong for my bike? The spacer behind the sprocket (that the oil seal runs on) is the correct 11.5mm thickness.

Hi Guys, I have an issue with my TR77 350 clutch is working okay select 1st gear ok pull away but while moving can not go up the gearbox, the same when I stop moving and the bike is running. when the bike is not running I can click it up the gears by hand. ??? anyone had this before or know what the issue could be, im unable to split the crankcase as do have the know-how leave that to the pro`s. Any suggestions of good engine builder who could have a look, im based in Hemel hempstead. Many thanks Rick

Hi all I'm new to the forum (and Ossa's) and hope you can help. I'm restoring a TR77 that I got in pieces 15 years ago and am finally getting it together. The engine is stripped, the crank rebuilt, and the main bearings and other bearings in the casing seem easy enough to source, but I'm puzzled at the blind needle roller pictured below. Is this an open-at-both-ends bearing fitted up against a blocking end piece, or is it a one piece closed-at-one-end needle roller bearing? Also, does anyone know what number bearing it is so that I can buy one from somewhere? Is it easy to remove? Any other tips or comments you have would be much appreciated Thanks Adrian (P…

Simple question on the rear brake assembly/chain tensioner. Can this be removed with the engine in or is it an engine out job?

Hi, Anyone have a wiring diagram for TR77? Looking for information on the magneto wires, I have 4: Black - Ignition Yellow - ? Green - ? Pink - ? I am assuming one is for the horn, one for lights and one for brake light. Carl.

I have just got a 350 TR80 and its missing the front end of the brake linkage, the bit that goes behind the frame and ( I think) under the swing arm, does any one have a picture of one so I cane make one ?

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

What are gear ratios for a 5 speed 250 MAR? Thanks.

I found this place on-line and thought I'd post it up as a good source of Ossa spares: http://trialstribulations.net/index.php?main_page=index&manufacturers_id=7 I got a little order today with a few spare parts only 11 days delivery from the UK to Australia. The order was really well packaged, good service. I am in no way affiliated with these guys, just a happy customer.