bad compession Xl 600 r
 

hi engine giants
after having probs with the dcrompession valve
we opened the engine of the bike mentioned above..;
valves were treated with that tightn paste. decoke-paste
pistonrings have nt been verified but are very likley to be allright... gasket of the head okay
but loss of compression
tightener of timingchain inserted with problems in the cliche arab way without having special tool
we didnt take care of the decomression mechanisim that well wehn we mounted the head... could that be the solution
because of our stay in tamanrasset algeria at the moment ur help is desired.. requested and even bagged for (-:
thanx for thinking and writing

I'm not clear about what happened here - when did you start noticing the loss of compression? Did you adjust the timing chain and then have the problem or did you adjust the timing chain because of the problem?

If you didn't "take care of the decompresion mechanism well" that seems like the obvious first place to check.

Check your valve clearances again to make sure they're okay. Do you have a feeler gauge?

When did you last adjust your valves?
You might have adjusted them improperly, but that doesn't seem likely since you would probably notice the loss of compression right away. Make sure you DO NOT turn the crankshaft backwards when you're setting it to top dead center - if you pass it, keep turning again until you reach TDC.

Wright

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Wright Bagwell
http://www.geocities.com/wwbagwell/

Hi
I am truying to think;
Bad compression:
1 Burned valves
2 Piston rings
3 blown gasket

Most likely nr.1 if nr 2 your engine would smoke a lot when firing up.Nr 3 oil leak.

Cure:
Engine in TDC. Take of the head. Take out the valves. Regrind the valve "head" (not shoure this is the right word) with valve grinding paste. Make sure you have an nice even surface on the whole valve.
Put on the head make sure you set the timing chain correct, if not valve damage and los of compression.(count chain links several times)
Adjust the valve clearance. Ad some oil ond the cam and rocker arm.

Engine back in frame
Check valve clearance again (just to be sure)
You do not need to bother with the decompression system when you put things together. Do not atach the decompression cables(manuel and kick opperated)
Start the engine with the electric start.

I can not remmember if you need a special tool to put the timing chain on???

Take a cup of tea and check all operation several times.
Hopefylly this would cure the problem, if you whant put the kickstarter opperated decompression cable back on place make sure you have enough free play.

Good luck

Frode 86`XLM