OSSA

Hello good people. I bought my self a cheep defective Ossa. It is in a rather good shape, only inner head gasket is blown. After cranking it pops like a champagne when opening a radiator cap. Coolant that I have drained smells on gassoline. As I can see 4 side bolts will be the problem to torque with my Nm torque wrench because of a frame interference . Should I use some special tool , or release engine in front and pivot it a bit to make some clearance? One more thing. I read that inner oring is better to be silicone than NBR one, any oppinion on that? Many thanks !

Hi, Thinking of fitting a PWK 28mm on the old Gripper. A common mod by all accounts, however I’m struggling to find the basic start jetting for these carbs. Does anyone know and willing to share? I have an 28mm OKO already but I guess it’ll need jets/ slide/ needle to suit the gripper. TIA Brent

Hi guys i’have a problem with the control unit of my Tr280i... My friend gift me the cable to connect the control unit but i havent the software (K-Scan for Ossa) where i can download it?

Hello guys. Allow me to introduce myself. I own an Ossa TR280i from 2012 and I no longer know where to go. I have an almost certain problem with the ecu, but I don't have the K-scan program to look at it. Could someone please give it to me. I would be grateful. Greetings to all

I have just become the owner of a new Ossa 280. I have coveted this bike for many months and its finally a reality. But I just cannot start it. Others have. But I seem unable to find the trick to it. Can anyone help me. My soles are bruised and battered and the bike sits looking like a bitchy virgin on her wedding night. Help me.

Hi folks, currently stripping my 250 gripper engine.. quick question about removing the crank, there appears to be a washer needing removed in order to pull the crank from the case.. does this simply pull off as it seems quite tight, hope this makes sense? Pic attached of said washer. Cheers John.

My original IRZ is working just fine and with very low miles I decided to try replace it before wearing it out further. I purchased a Taiwan made OKO kit from Mid-Atlantic trials (I am in the states) and wonder if any of you had gone this route? The tuning seems straight-forward.

I have a Caswell-lined fibreglass tank and wondering if I should, or need to, remove fuel mix while storing over the winter (Canadian) and if so, should I replace it with something or okay to leave empty. For my street bikes I just top up tank and add a bit of stabilizer. I asked my neighbour who owns a boat and he says it should be fine if it's treated/lined as it protects from ethanol. Thanks in advance.

I seem to remember reading posts here about someone that could rewind a stator for better starting? Was that fella in the USA and if so what was his contact info? Thanks.

Hi, I have decided to sell my OSSA tr280i it's in fantastic condition and is keep in my house on display please have a good look at the photos you will not find a better example. £2000. The bike is still available for sale my number is 07776105321

Need a new throttle assembly, anyone experiment with the Domino fast vs. slow on an OSSA MAR 250?

Went to start my 350 TR 77 after a carburettor rebuild And because of a recent injury I can't kickstart it so I used a roller starter I noticed that the bike was backfiring on start up and wouldn't run .It was then I noticed that some of the back fire was between the head and the barrel so it definitely looks likely the head gasket is fubar.. sorry for the long post but how easy is it to fit a New gasket And is there anything that I should be aware of?? Many thanks Phil B

Just about to replace sprockets. what would be the best sprocket sizes front and back for genral trials sections. Many thanks.

Hi all I guess this has been asked before I love the green colour of my Tr77 however the side panels are in pretty poor condition so I was thinking about replacing with pattern part's any help on the nearest to factory green would be appreciated, I'm leaving the tank as it's got some nice age related marks And the plan is just to clean it And then clear coat.. Cheers

Hi Folks! My Explorer ran out of fuel on a 10mile road trip at about 45mph. After hearing a strange sound I immediately pulled the clutch and the engine stopped. After refueling I noticed that compression is lower than it was before but still present. I am worried that the piston seized as the engine doesn't start any more. Any ideas what I can look at before I start dismantling the whole engine? Thanks! Felix

Anyone used the nibbi carb as a replacement..? The Amal MK2 2627 on my TR77 needs a complete rebuild including a New slide. I can buy the nibbi And a selection of jets cheaper 🤦‍♂️ do I replace or rebuild

Hi just picked up a 1978 tr77 starts lovely and idles nicely BUT after a few minutes it will pick up the revs to almost maximum without any input without sounding dense where do i start?

Hi all my ossa 350 has an Amal MK2 2627 carburettor fitted I want to buy a rebuild kit so does anyone have an idea on what jets, needle, And needle setting,and slide I need please,(slide is very worn)

Hi again.. I've not started the bike for a couple of days and now the kickstart is not moving.. I can literally stand on it And no movement..if I pull the clutch it goes full stroke.. also if I remove the plug so no compression And put it in second I can crank the bike forward on the kickstart.. any ideas please on what is going on? Stuck or damaged gearing

Hi, does anyone have one of these bar pads they will sell