OSSA

I have just found out that where I thought I had a 250 MAR, it is in fact a 350. Last year I brought a new Minuki carb for the bike but spec'ed for a 250. What jets and setting should I change too?? i have noticed the bike has a low down flat spot , so hopefully this is the reason why?!

During a trial this weekend I noticed a creaking from the clutch mechanism whilst pulling in the lever. It is also heavier and notchier than my mates OSSA clutch. The noise seems to come from the cable, but I worry it might be transmitting up the cable from the clutch arm ?? Will a cable be the answer to my problems, and is there any way to make it lighter than it is ?

I have an OSSA that has come from Italy. It was sold as a 250 , which I beleve it to be, but today at a trial it was pointed out that as I have cutout on my fins, that it may be a 350?? The engine no. Matches the frame no. But the number doesn't show up on any of the lists I have seen. Any info in aging the bike etc would be appreciated. Or even recommended upgrades, mods etc...

I can't seem to find the info, so thought I'd ask. 2014 Factory 300. There are two maps- 1 and 2. What do the two positions do? Which is 'soft' and 'hard'? I see on some other maps they list which is which (or 'hard' and 'Road' etc), but the Factory one does not. Thanks Mark

Hi guys. Got a 2012 Ossa TR280i for a price i could not say no to. I'm a bit worried about parts, and already want to order me a new rear fender as i am pretty sure I'm going to break the one on the bike eventually. Where can one order Ossa bits these days?

Hi just acquired a 2012 ossa tr280i but I have a couple of problems with it , firstly the linkage is showing signs of play ,looks like its coming from the centre bolt on the rocker , where can I buy new bushes and pins , also rear silencer is cracked badly so looks like I need to get that welded , but I'm guessing it will eventually fall apart again . also the rear wheel bearings are shot , does anybody know what size bearing they are ,? thanks in advance.

Sorry for another daft question,but I've nearly finished the rebuild i wish i hadn't started. have just received a new countershaft sprocket which i ordered specifically for it, it has a shoulder on it.( talon TG375 ) The one i have just taken off hasn't so theres not a lot of threads left for the nut soo frustating, can anyone confirm the talon sprocket is correct, and do i need to get another sprocket spacer.

Hello, i am wondering what is the factory fitted hydraulic clutch oil? I cant find data anywhere in pdfs. Will lhm+ or magura blood fits?

Hi All, Just starting a resto' of a 350 Explorer. Mostly complete,engine on the bench,just missing the long travel seat if anyone knows where I can get one? Does anyone know the proper frame colour on these. As you can see from photos it obviously been sprayed in the past but there are 2 colours,black and a dark silver. I have seen them in various shots/brochures with a black frame as well as silver as the MAR. So can anyone help,were they black or silver. Thanks in anticipation for your help and any advice

Bit of a stupid question, but when you put the nut securing wire on the mar clutch, do you route the wire through all 5 posts or wire them individually

Hi I'm wondering if any has modified the rear brake on a Ossa Mar to remove the cable and convert into a direct link pull. If so how is this done and does it improve the rear brake action at all. Many thanks

Recently, there was a need to remove the cylinder from one of my friends 72 MAR 250s. With the head removed, we expected the cylinder to slide easily off the studs. P, time and water had corroded the studs and cylinder along the cylinders entire height. We soaked the 4 studs for a couple weeks hoping to have the cylinder release. When the cylinder refused to release and be removed, next I attempted to unwind the long studs. While i could see several of the studs twiting as I tried to remove them, each would untwist back to where they originally were positioned. Seeing this I feared the studs would break causing greater problems. Heat was even applied…

Not my OSSA MAr, but my friends. The bike he bought a while back, advertised as restored needing nothing has been one hack after another. To late to complain to the guy, and the seller was not honest in how he described and displayed the motorcycle. It was a long distance sale, so between emails, phone calls and videos, the bike was bought and shipped. Suffice to say the seller, that did the work should not handle tools and has no real regard for quality. Along with many issues, the most recent occurred last week. While getting the jetting dialed in, the engine lost power and began rattling. My first comment when told about this on the phone was he seized i…

Anyone have good solutions for a spark arrestor on a Termi? The exhaust doesn't stick out- but the inner (toward center of bike) part is flush. So the type I have won't fit. I suppose I can fabricate a pipe that will go inside the Termi exit and inside the arrestor. (The arrestor I use fits right on the standard exhaust) But I' like to hear if anyone has a better solution. Mark

Does anyone know the SKF size or part number for the rear wheel sprocket side bushing on the TR280i. I'm not interesed in maching the hub to accept a bearing.The bushing is fine.

Well, I now have four OSSAs in the garage. (One is a restoration project). we did some trading and I now have the 2014 Factory 300 that has been talked about a bit. I didn't have much trouble starting it, but I'm going to do my 'super easy start' mod anyway. I'll check the mixture and all that stuff too. Certainly more power than my Explorer, but it is heavier also. I'm not exactly sure how I'll set it up- some sort of 'long range' seat/tank likely the Betas have I think. I'd like to try one of those and see if they fit. Mark

was out today for a run,great fun. After a while it started to "burp"at the radiator,fan did not work. Used the software to engage fan but no,relay said"click" but no fan. Some check on cables,swapped out the relay and yeess,fan working again. Did som on/off via software and then out again to drive it up to temprature,runs like champ! Happy hollidays Christian

This is why we check things over now and then.Off to the welder guy.Check yours before the mount is destroyed.

Any idea on how to pull the headlight out. Looks like 2 clips on each side and it'll slide out, but am concerned with snapping the clips and obviously never finding a replacement. Any hints, tips or tricks? When changing my AAA battery behind the headlight in that black box, I inadvertently pulled a little too hard, and the tiny little frail wires that connect the headlight pulled loose. Need to get in there with a soldering iron.

I went for a first ride on my restored Ossa MAR today and experienced a few issues I have put down to carb. The AMAl is the original from 1973 so I figure it has probably seen better days. All I know is that despite new jets and refurb kit the bike has no zip making climbing banks almost impossible. I'm thinking therefore of changing carbs to a Mikuni. I appreciate that this one has been done to death but...The general concensus seems to be a 150 main and 35 pilot on a VM26 Mikuni but this is only part of the story. The Needle and Jet needle are very important also. The standard VM26 comes with a O-0 needle Jet and a 4J13 Jet needle. For those who have fitted a VM26…