1987 DT200R crank seals. Install.

[Hoolies]

Hello everyone.
I've been having a problem with the bike over revving when throttle is closed. I have read and been through every possible fix except a) the reed block letting in air or b) the crank seal letting in air.
Yesterday I noticed the smoke from the exhaust smelled like a 90,000 mile 4 stroke so now I know its the crank seal/s (oil being pulled from the gearbox into the cylinder and being burned).
A question if I may:

• Am I missing anything from the list of parts I need to get this job done of replacing the crank seals?
  1, left and right side crank seals.
  2, clutch cover gasket
  3, Magneto cover gasket.

Thanks, rob.

[Calum]

Just checking, the crank seals aren't blind on the 200 cases are they?

https://www.fowlersparts.co.uk/parts/4136407/dt200r-dt200rh-3cj8-1996-010-a/crankcase

I can't recall whether they can only be insterted with the bearings out. That's certainly the case for the RS engines.

[Hoolies]

Oh no, I'd assumed they could be pulled out and replaced without touching the bearings or splitting the caes.

[Calum]

Yeah it's worth checking that first. I haven't done a set of DT cases for a while, I've never done 200 cases.