Have your valves ever needed adjustment?

[docdoru]

Very good question addressed by Dudley.
All 4 exhaust valves shimmed (2.225 to 4.625) @ 42K.:chat:

[sylblk]

12k miles check. no adjustment needed. good metals!

[irish2themax]

At 65 my valves needed adjustment YEARS ago!

[BLACK WIDOW]

At 65 my valves needed adjustment YEARS ago!

I think I know what you mean-:shemademe_smilie:---But on the bright side you still have valves to adjust:D

Michael;)

[groundeffect]

Very good question addressed by Dudley.
All 4 exhaust valves shimmed (2.225 to 4.625) @ 42K.:chat:


I agree, a great question. I've rode 21,000km on an XT250 dual sport motorcycle and checked the valves every 6000km, and never needed an adjustment. However, the Spyder Rotax engine seems much much much much more complicated and has much more power then the 250, so it is good to hear it will take quite a few miles before an actual adjustment may be required on the Spyders.

Interesting thread.

Cheers, everyone.

[WaltH]

Very good question addressed by Dudley.
All 4 exhaust valves shimmed (2.225 to 4.625) @ 42K.:chat:

The shop manual indicates valve clearance specifications of .22 to .29mm for the exhaust valves. Does this mean your shims were very large, or am I missing something? I am not a motorcycle technician.

[jgwoods]

Very good question addressed by Dudley.
All 4 exhaust valves shimmed (2.225 to 4.625) @ 42K.:chat:

I'm wondering what you are saying here as well.

Usually Valve seat and valve face wear make clearance go tighter after a while.

[truck 85]

just a guess but he put in a thicker shim to open the valve more to account for the ware

[groundeffect]

Hi Everyone.




.22 to .29mm for the exhaust valves.


I guess the specs for the intake valves are in the shop manual also...?


When checking my XT250 valves, I would just use a thickness gauge to be sure they are within specified range. If so, no adjustment required. Would it be the same procedure with the Spyder then?

I found the hardest part about checking my XT250's valves was getting panels off and getting to the exhaust/intake ports to do the check.

Is it difficult to get at the valves on the Spyder?

thank you.

[docdoru]

I'm wondering what you are saying here as well.

Usually Valve seat and valve face wear make clearance go tighter after a while.
New Shim Size=Measured Clearance - Desired Clearance + Existing Shim Size :thumbup:

[BLACK WIDOW]

New Shim Size=Measured Clearance - Desired Clearance + Existing Shim Size :thumbup:

What was the measured clearance?

Michael:doorag:

[jgwoods]

I used to be an engine rebuilder- probably done 1000 in my 23 year mechanics career. Some of them even had shim under bucket systems so I am well familiar with the system.
Are you saying you had to use shims that ranged from 2.225mm to 4.625mm to get proper valve clearance?
That's a big variation. Were the factory shims that far apart in thickness?