as some of you may already know i've just bought a '97 beta techno 250. It's my first trials bike after a few years riding enduro, and had a quick play on it tonight and rather enjoyed it! pulls well, hopping over rocks etc!

thought i'd give it a good service so got carb off, going to do oil, calipers are both coming off etc

I took the side casing off and there is a bit of play in the flywheel :s I've heard on some bikes this is normal? I don't know whether it is excessively vibey or not as I've only just bought the bike and the engine is so vastly different from the ktm's I'm used to i can't tell if it's rattly or not to be honest! (went to a trial last week and they all sounded rattly!!

just wondering if it's main bearings? or if it's just normal play?

cheers

yep mains have had it 50 odd notes (+seals) from lampkins , sort it sooner rather than later, tired main bearings will quickly destroy the bigend, you will need a gasket kit as well

thanks. the bearing price is irrelevant as my dad works for a bearing company rather handily! so i assume it's possible to buy seals seperately?

Also how hard is it to do? split cases job or..?

Do bigend split crank while your there! once did mains on a techno then a few rides later bigend let go! cost me another set of bearings and gaskets! all betas have a clutch rattley noise!

can you give me a brief run down of what would be needed done..

i.e. would I'd need to remove engine, top end apart, split cases?? replace bearings, balance crank??

cheers

The main bearings normally start out at clearances(up/down) of .003 in, and I would suspect a wear limit of double that. So point being, as long as they are not excessively noisey and rotate smoothly, I would put an indicator on the flywheel just to get a guage on them. Out that far on the wheel, you might get 010. or so.

cheers 8)

think i'm going o get all the parts together and get it done sometime in the next month or so. got the bearing numbers i need so shouldn't be too expensive or bad to do!