rm250 engine cases

[geoff22]

Hi guys . I have started a restoration on RM250E and have just noticed that the bottom engine mount hole in the cases has elongated. Does anyone have any ideas on what I can do? should I worry or not. Should I try and source another set of cases? All the other engine mounts are in good shape

[cyclegod]

Don't worry about it just use spring washers and nyloc nuts and make sure they are torqued up nice and tight

[Doc]

If it was bad and there was enough material around the hole I'd bolt the cases tightly in the frame and then bore a nice new hole and up the size of the bolt. If it's not bad do the above and keep a check on it. Also check the inside side clearance..chances are if it (the motor) was real loose it's not only elongated the hole but the cases maybe a fraction narrower now too in the day suzuki recommended shimming this gap between the cases and the frame with suitable flat washers or shims as they referred to them

[suzuki27]

I remember reading an article about the RM250T-which I had just bought new-and the engine mounting bolts were of a smaller diameter to the case holes.This,they said,was the cause of some broken engine mounts.As the other guys have stated,drilling out and going larger or shimming out -both will work.I just rebuilt a 125D with ovalled front engine mounts and worn cases from the movement here-I just shimmed it out and used nyloc nuts with loctite and all good for about 2 years now.

[caps 999]

why noy drill the mounts out and fabricate a bronze bush

[Doc]

cause that's too much trouble unless of course you have a lathe in the garage..that would help