dave dix

Well done , insurance company's do this sharp practice all the time. Dave

Its always best to replace both friction and steels together thou you can usually get away with just friction but worn out already? I would check the hydraulics for air etc just in case Dave

I will check it out, i have bored the barrel and have 3 thou clearance with around 5 thou ring gap and the motor sounds sweet. I never knew they had so much compression !!! Dave

I use ATF (TQF) in engine on my ty250 ts , ty250 mono , clutch in my 348 and 247 cota,s and it works great Dave

You have to de-nicacil first, then bore and re-nicosil as you cannot bore plated liners as its too hard Dave

Hi, anyone got a manual or know the ring gap and piston skirt to liner clearance as i have located an oversized piston (ebay) and its winging its way over to me. I have got the barrel mounted on my old van norman boring bar ready to go as soon as the piston gets here and i can give it a good measure up. The barrel was on its second bore and the piston was standard!!! and it had a fair old rattle to it, its amazing that someone would put an engine together like that. Cheers Dave

Thanks Helm, i thought that was the case as the barrel liner sits into the head but its best to be safe then sorry Dave

The exhaust is a bit of a bitch but it will go on with the head and barrel fitted because i did it on my malcolm Rathmell replica 348 Dave

Hi, do 247,s have a copper ring head gasket or just gasket cement as my one didn't have a head gasket but had two base gaskets Dave

If you are using synthetic oil then 50-1 and 33-1 on mineral just to be safe Dave

I think they were silver (ty175E) with white tank and red stripe thou i have seen red frame with the same tank Dave

Drain the oil and use tqf (atf) and pull off in first and clutch in and stamp the rear brake a few times until it dis-engages and run for an hour or so then drain the tqf and re-fill with clean tqf , problem solved Dave

I wouldn,t bother changing the frame to a mono or putting disc set up either as you will loose its value and character Dave

I would say all your probs sound carb related, unlike the montesa a ty doesn't have crank seal holders but you should be able to hook them out without a complete strip but you wont need to as your problems are carb related (hopefully !!!!) Dave

Thanks woody, i have already contacted him but no o/s pistons as of yet, it was a bult piston he has that looks like it may fit but i'm not sure on wrist pin size and pin height etc. O/S doesn't matter as it can be re-bored to size Dave

Hi, does anyone know the differences between the two as i am after an o/s piston for a 247 montesa and as bultaco pistons are more common i was hoping they may be interchangeable without too much trouble, Are the small end bearings the same size (piston pin same size ) and the same height. I can always more the ring pins if needed Dave

Sorry TQF is ATF transmission oil Dave

My frame no is a lot higher 51m 7997 and it has the welded gussets Dave

I use tqf in my 1976 ty250 and it works fine with no sticking clutch Dave

Its a Malcolm Rathmell rep model, just like my one , i will have to check out my frame number Dave

I bring the mag to firing point then loosen the points screw , tap them, then do up the screw and the heel should be just touching the cam. Dave

The basket is on a straight shaft so a tap should do it but you must let it twist away from the primary gear as they mesh together and re-fit the two together Dave

Just std spokes on a ty175 and i run my ty250 t/s on 33-1 as i like to see a bit of smoke to stop me worrying about a seize up!!! Dave

Its r/h thread, i just knock the weight off , flatten locking tab on clutch nut (r/h thread ) and be careful not to loose the three rollers. Now have fun with the primary sprocket. The mag flywheel nut is l/h thread and remove the wheel with a puller. Both seals pry out but be careful as the housings are magnesium and very brittle Dave

That is an early one, the engine numbers on my 247 are on the top of the front engine mount in front of the cylinder Dave