valve adustment

[two-stroke-brit]

Hi all, Am i reading this right , i need to remove the camshafts to adjust the clearances by swapping out the buckets.

cheers mark

[Teego]

Hi all, Am i reading this right , i need to remove the camshafts to adjust the clearances by swapping out the buckets.

cheers mark

Almost right. You need to remove cams after checking clearances so you can get in to change shims. Buckets are retained.
Good luck.

[two-stroke-brit]

thanks teego.

[two-stroke-brit]

Hi All, i have searched for the timing rotor plate 33M-81673-10 as called for in the manual but cant find one on ebay or partzilla.
also it says to turn the crankshaft counter clockwise but it just lossens the bolt .
what am i doing wrong.
i just want to check the cam valve clearances.
cheers mark

[Teego]

I can e-mail you an Exup service/repair manual if you like. Just PM me with your address.

[two-stroke-brit]

that would be great .
mark.dobson@sbcglobal.net
thanks mark

[Teego]

that would be great .
mark.dobson@sbcglobal.net
thanks mark

On its way.

[two-stroke-brit]

got it thanks .
any pointers to finding a timing plate ?
thanks mark

[Fatdog]

You shouldn't need the timing plate.
If the end of the crank is the same as my YZF, all you need is the correct bolt (M8?) and a flange nut.
Screw the flange nut on the bolt (with the flange side opposite the bolt head) and then screw the bolt into the end of the crank. then tighten the flange nut up against the crank (this is the key - make sure it is well tight!).
You should now be able to turn the crank using the bolt head. If the nut comes undone then the nut wasn't tight enough.
Remove the spark plugs as well to reduce compression.
Good Luck!

[two-stroke-brit]

thanks for that fatdog ,that makes sense it is 8mm as you say.
will take a another look on the 4th .
cheers mark

[two-stroke-brit]

so i took the rad off which helped a lot.
and locknuted the 8mm bolt into the crank.
and was able to check the clearances.
all the exhaust valves were between 0.2 and 0.25 mm happy with that.
but all the inlets were under 0.1 and some were probably close to zero .

i don't think would that cause hard starting, would it ?

thanks mark

[Graham Crayon]

I would do a compression test on all 4 pots. 140-160 is considered healthy as I recall. Considerably less on any one of them & I would expect it to cause starting problems for sure.

[Teego]

so i took the rad off which helped a lot.
and locknuted the 8mm bolt into the crank.
and was able to check the clearances.
all the exhaust valves were between 0.2 and 0.25 mm happy with that.
but all the inlets were under 0.1 and some were probably close to zero .

i don't think would that cause hard starting, would it ?

thanks mark

I would have thought that if your inlets were tight that would bugger Fuel/air flow and affect starting.

[Fatdog]

so i took the rad off which helped a lot.
and locknuted the 8mm bolt into the crank.
and was able to check the clearances.
all the exhaust valves were between 0.2 and 0.25 mm happy with that.
but all the inlets were under 0.1 and some were probably close to zero .

i don't think would that cause hard starting, would it ?

thanks mark

I would have thought that if your inlets were tight that would bugger Fuel/air flow and affect starting.

I would agree with Teego.
They need doing anyway so do them first and then see how you get on.

[two-stroke-brit]

thanks everyone i will keep you posted .
cheers mark