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Smoke... Valve guide or ring???

Started by rule62, April 30, 2009, 11:59:05 PM

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Howie

#15
May 03, 2009, 12:59:09 PM
Heavier oil might help, but I wouldn't go heavier than 20W-50.

ducpainter

#16
May 03, 2009, 04:27:18 PM
Quote from: howie on May 03, 2009, 12:59:09 PM
Heavier oil might help, but I wouldn't go heavier than 20W-50.
+1
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


rule62

#17
May 20, 2009, 12:39:52 AM
So, the bore on a 620 is listed as 80 mm.  FBF has a hi comp kit for the 600, but it lists the size as 80 mm.  Can I assume that the pistons will fit since the bore is the same?

ducpainter

#18
May 20, 2009, 05:18:36 AM
The pistons should fit the bore and the wrist pins...

the valve pockets may be different, and the dome might create clearance issues in the head.

One bike is carbed and the other injected so it's possible the combustion chamber is shaped very differently.

If you can deal with any issues that pop up I'd probably be inclined to try it.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."


rule62

#19
May 21, 2009, 03:36:11 PM
Asked BB if the 600 pistons would work...

Ryan

The 600 piston is longer due to the shorter stroke, the crown will be much smaller due to the 600 having the very small chambers from the 400 motor and the valve reliefs will be much too small.  I don't know of any 620 hi comps, and the std pistons are domed anyway to work in the 750 sized chambers.  Best to go the 750 big bore kit.

Brad


Also asked a local Duc Guru here in Phoenix, and he said he'd be surprised if it were a bad ring with only 15000 miles.  He said i shouldn't have to worry about rings till closer to 80K.  Wish me luck.  Maybe it'll only be a valve seal.

rule62

#20
May 22, 2009, 11:39:20 AM
Sure enough... the valve seal on the vertical cylinder exhaust valve has a nick in it.  Hopefully that's all that's causing the little bit of smoke I've been seeing.  Local Duc dealer has the parts.  I'll be picking them up at the Street-Fighter premiere tonight.  Tech day at the Mad Scientist's (Dietrich) on Sunday!

rule62

#21
May 24, 2009, 03:46:05 PM
Vertical cylinder exhaust valve giude seal replaced.  Tore the first one trying to get it situated.  Glad I bought a spare.  How do you say "That was a real pregnant dog" in Italian?   :P  Thanks again Dietrich, for your help, and HAPPY BIRTHDAY!!!   [beer]

rule62

#22
May 27, 2009, 12:59:58 PM
Dietrich is NOT a shade-tree hack.   :-*

Dietrich

#23
May 27, 2009, 01:08:53 PM
Quote from: rule62 on May 27, 2009, 12:59:58 PM
Dietrich is NOT a shade-tree hack.   :-*

HAHAHA...Thanks Ryan for setting the record straight!  I don't mind the title "shade tree hack" though, has a certain ring to it.... ;)
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