oggy132

good evening woody ,Have you any idea what size the holes are in the perforated tube, and does it matter how many holes their are in it as the perforated cone is probably the most difficult to make. thanks oggy

Hello all, has anybody ever tried to make, or get the middle section of the mar exhaust made from aluminum???. I may no sombody who may be able to make one, and im interested in asking him to giving it a go!!. Any advise or help would be very gratefully received.

thanks for the advice i will get the new parts and let you know how i get on.

thanks woody i will order them tomorrow do you know if hitchcocks will have the needle

cheers woody the needle jet and the pilot jet are correct just was'nt sure with me finding 3 things wrong in the carb. Have you got a measurement for the needle so i can check it is the correct one as if it is wrong i can order one with the main jet. Also can you please advise me 150 or 160 on the main jet and how many turns to set the mixture screw at. thanks oggy

Hello all, can anybody help??? my ossa starts on 2nd kick, but will not rev at all.I have changed the float needle and needle clip as they were the wrong ones. Iv'e cleaned the jets and i have put 2 different petrol tanks on but still it will not rev. The needle is set on the middle groove, but i do not no if it is the correct needle for the carb, and cant find reference number on the part to replace it. I no the main jet is incorrect being a 120 but thought it would have run a bit better than it does. The engine sounds like it is being starved of fuel but it tickles ok. (carb is a amal 627) thanks oggy

thanks woody i will take a look after hope the site can help as i have a 1000&1 questions to ask over the next few months/ years hope you dont mind me moithering to much many thanks oggy132 a new boy to ossa

cheers woody that clears a few things up for me but still a bit confused. all the 250 mar's i have seen on the net seem to have the rear brake on the right and the drum on the left but they are both on the right on my bike does this mean that the rear wheel is off another bike.

Hello all iam hoping someone will be able to help me to id my ossa which i think is a 74-76 250 mar. The problem i have is after reading most of your posts iam a little confused. the frame number is B-231454 and the engine number is M-223282 i realise that they do not match but i have read in your posts about some frames which are zinc plated my frame is but has a side stand and the frame number i was wandering if my frame was a whitlock i do hope you can help regards oggy132