OSSA

Hi What is the correct timing for the stator on a 250 MAR? The flyer manual I have (250 and 175 engines) mentions "Plonker, Pioneer and Stilleto" which of these should I reference for working on a MAR? regards Gordy

Hello again, Some more questions if you guys don’t mind.. I’ve got the manual and I’ve searched the forum but am still unsure about a couple of things. Firstly I’ve got an MK1 ( I think) with MK1 engine ( number M -342454) I’ve found the gasket and seal kit on the inmotion website but it only shows one set / option for a MAR 250 with no reference to production years. Are all 250 mar engines identical? I could be totally wrong but I seem to remember seeing reference to a smaller crank on the early MAR on a US website.Just wanted to double check before ordering . Im also a bit confused on the rear brake cable routing.. the ma…

I recently acquired a Pluma/Plonker that came from a high elevation. I live at about 1,000 ft. elevation above sea level and the bike runs too lean. The bike has a 24mm IRZ carb and I want to keep this carb on the bike. I know finding IRZ jets isn't very easy and I want to limit the number of jets I purchase. Does anyone know what jet sizes and needle clip position this carb came with or should have for a lower elevation? Currently, the carb has a 45 pilot and a 101 main jet. I could guess and get a 50 pilot and a 110 main, but like I said, would be nice to know more specifically without all the trial and error.

Hi everyone. Is anybody have electric connection of OSSA Explorer? I have only TR280 workshop manual, but its not the same. Thank you!

Quick question, are OSSA still trading? Havnt seen anything on recent videos on youtube from anyone. Obviously there are no OSSA riders in X Trials but also dont see any at amature level videos either.

I have found many discrepancies on various sites for these two models. I thought they were practically the same and that only the colors changed. Is anyone able to elucidate me? On the Ossa website he says that there are different cases in one 350g of oil and 450g in the other. The total weight of the bikes is 2 kg different They have different gearbox bearings. I thought they were the same ? Do you know anything about it? Thank you

Hi guys where can I get a new complete kick start for an ossa 1976 250 mar. There like rocking horse poo . Thanks

I have fitted a headlight to my OSSA MAR using the rubber straps, but it is very loose. I cannot see any way of tightening the straps. Am I missing something?

hi where could i get a year of manufacture for a ossa mar so i can get it road registered. many thanks

Penso che sia una buona idea indicare dove acquistare le nostre parti di bici https://www.zonetrial.com/Articles.aspx?langue=E&MarkSelected=Ossa&topic=0 https://trialstribulations.net/index.php?main_page=index&manufacturers_id=7&sort=20a&page=3&zenid=6od90vt7vtam74t4n365i36kv7

I have a 1974 Ossa MAR. If it sits for any period then the kick start lever will not kick freely to clear the clutch. I let it sit for days with the clutch lever clamped to disengage the clamp. It still doesn't kick free so I read on this board some time back that one way of dealing with this problem is to put the front wheel up against the wall and then start the bike. I did this and even though the clutch was not free, when I started the bike it ran as if the clutch was disengaged. What am I missing here? I need to take it somewhere to ride it and do any shifting so I haven't (I'm 73 yrs old so lots of trial and error is hard work). With it up against the wall with…

Ok guys, being a bit cheeky here. My Amal has had its day I feel so looking for an alternative carb. OKO seem to get a good review and I’m aware of all the copies and the preferred purchase site. What do people use 26 or 28 mm and most importantly what are the best jet sizes? It doesn’t say on the Ebay site what jets are in as standard when you purchase a carb.

Anyone know what other bikes use the same front brake pads as the 15 Factory 300? They do not have locating pins, but rather rounded areas that lock into the caliper.

Does anybody know if Mr Sell is still offering his services? I have tried contacting him via phone numbers listed online but no joy as of yet. Thanks in advance

Planning on replacing all the bushings of the linkage suspension of my 2013 Explorer. I can only find a 2012 Explorer parts manual. Are all the bushings the same between 2012 and 2013 Explorers? Or should I use the part numbers from the 2013 TR280i parts manual. I compared the p/ns between the 2013 TR and 2012 Explorer and couple of the bushings p/ns are different. Any input would be greatly appreciated. Thanks!

I'm thinking of having a go at trilas riding and as I own a couple of Ossa Road and Road Race bikes its got to be an OSSA for the dirt. After 35 years of riding on the road a recent go at a twin shock trial on an Yam TY 175 was a batism of fire for me, with everything I though I knew about riding a bike being turned on its head. I'm thinking of getting either a TR77 or a TY 80. Reeding different comments on the web there seems to be some issues with the handling of the TY 80 but no one seems to say exactly what or why it has issues. I know Mick Andrews didn't like it but again I don't know why. Can anyone shed some light on the what were the 'issues' wit…

Anyone know of a cheap substitute for the TR280 fuel cap until I get a proper replacement? Up here in the GNW ordering parts take a long while to get here. Kinda need one by Saturday. Sheesh thats two days away. Does the Beta EVO fit?

Oil form gearbox comes to engine, because rubber on the bearing is bad. I changed out ring rubber, but it still dont work, and oil going to engine. Is anybody know, how to change bearing?? I dont understant how to unlock this bearing. I cant find information on manuals... I think, i need pull gear and make hot, and after pull bearing...

Hi, I have been having problems with my gearbox on the ossa. It started a few weeks ago where I couldn't change up from 2nd to 3rd. The gearbox came out and the selector drum was worn where the rollers turn it. I replaced this and rode last weekend. I managed to get into all the gears, but it needed repeated attempts to change. Also I noticed that there was a vibration coming from the gearbox. I now have the gearbox out again and notice how much movement the drive shaft (sprocket) has. It will lean left and right and also the shaft itself will move up and down. I wonder if this is normal? What holds it at the bottom (opposite end to the sprocket)? N…

Ossa 300i can anyone confirm its year....