Cross Threaded Spark Plug Hole - Page 2

gaillarry · 08-14-2010, 08:07 AM

Going to pull the cylinder head and take it to a machine shop and have it done right. I have the manual, any tricks getting the head off?

GTGZ · 08-14-2010, 09:13 AM

Just follow the manual, stuff a clean rag under the cam shaft gear so you dont drop any bolts into the crankcase. Also be sure to replace the cylinder base gasket.

gaillarry · 08-22-2010, 09:05 AM

Got the head off and here's a pic of the piston top, lots of metal shavings and carbon buildup. New gaskets came in yesterday (base and headgasket) now to put it all back together. Local machine shop re-tapped the spark plug hole and the plug fits nicely.

Water Warrior 2 · 08-22-2010, 04:44 PM

Quote:

Originally Posted by gaillarry

Got the head off and here's a pic of the piston top, lots of metal shavings and carbon buildup. New gaskets came in yesterday (base and headgasket) now to put it all back together. Local machine shop re-tapped the spark plug hole and the plug fits nicely.

Looks like you are half way there.
Don't worry too much about carbon build up, it will increase the compression a tiny bit. :lol:

GTGZ · 08-22-2010, 05:41 PM

Quote:

Don't worry too much about carbon build up, it will increase the compression a tiny bit. :lol:

Maybe .001%

gaillarry · 08-22-2010, 05:51 PM

Since I had the carb off to remove the head I decided to clean it. The bike has been fouling spark plugs for years.

The cap was on the mixture screw from the factory. I drilled out the cap and to my shock the mixture screw was completely closed !!!! The tip of the screw is about 1/4" into the carb throat. Someone was asleep at the factory when the carb was assembled.

No wonder plugs were fouling and the piston was full of carbon. Whats the proper setting for the mixture screw!!

blaine · 08-22-2010, 06:31 PM

About 2 1/2 turns out to start .Once you have engine started,adjust for smoothest idle,about half way between lean & rich.
:2tup: :rawk:

Easy Rider · 08-22-2010, 08:39 PM

Quote:

Originally Posted by gaillarry

No wonder plugs were fouling and the piston was full of carbon.

I think you may still have that problem.....because the screw being all the way IN would have made it more LEAN, not rich. If you have another problem actually making it rich, you may find that the idle mix screw has no effect.

P.S. Be **REALLY** careful not to overtighten the plug. You may be missing 1/3 of the original threads.......or more.

gaillarry · 08-22-2010, 09:29 PM

I'll find out tomorrow when I start the bike. Have to let the gasket sealant on the valve cover set for the night. The machine shop did a good job of rethreading the spark plug hole, but advised me next time it'll need a helicoil.

I've read posts here - IN - Rich , OUT - lean...... or is it the other way around??

blaine · 08-22-2010, 09:39 PM

Quote:

Originally Posted by gaillarry

I've read posts here - IN - Rich , OUT - lean...... or is it the other way around??

The other way around "In-lean,Out-rich". As EASY said with the mixture screw all the way in it would not be causing your rich mixture.But would definitely affect your idle.

:cool: :roll:

08-14-2010, 08:07 AM	#11
gaillarry Junior Member Join Date: May 2008 Location: Ontario, Canada Posts: 24	Re: Cross Threaded Spark Plug Hole Going to pull the cylinder head and take it to a machine shop and have it done right. I have the manual, any tricks getting the head off? Login or Register to Remove Ads
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08-14-2010, 09:13 AM	#12
GTGZ Junior Member Join Date: Jan 2009 Location: roland, ar Posts: 23	Re: Cross Threaded Spark Plug Hole Just follow the manual, stuff a clean rag under the cam shaft gear so you dont drop any bolts into the crankcase. Also be sure to replace the cylinder base gasket. __________________ If it takes more then 2 strokes you're just playing with it!
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08-22-2010, 09:05 AM	#13
gaillarry Junior Member Join Date: May 2008 Location: Ontario, Canada Posts: 24	Re: Cross Threaded Spark Plug Hole Got the head off and here's a pic of the piston top, lots of metal shavings and carbon buildup. New gaskets came in yesterday (base and headgasket) now to put it all back together. Local machine shop re-tapped the spark plug hole and the plug fits nicely. Login or Register to Remove Ads
	0

08-22-2010, 05:51 PM	#16
gaillarry Junior Member Join Date: May 2008 Location: Ontario, Canada Posts: 24	Re: Cross Threaded Spark Plug Hole Since I had the carb off to remove the head I decided to clean it. The bike has been fouling spark plugs for years. The cap was on the mixture screw from the factory. I drilled out the cap and to my shock the mixture screw was completely closed !!!! The tip of the screw is about 1/4" into the carb throat. Someone was asleep at the factory when the carb was assembled. No wonder plugs were fouling and the piston was full of carbon. Whats the proper setting for the mixture screw!!
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08-22-2010, 06:31 PM	#17
blaine Senior Member Join Date: Feb 2010 Location: P.E.I. Canada Posts: 3,784	Re: Cross Threaded Spark Plug Hole About 2 1/2 turns out to start .Once you have engine started,adjust for smoothest idle,about half way between lean & rich. :2tup: :rawk: __________________ If at first you do succeed, try not to look surprised.
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08-22-2010, 09:29 PM	#19
gaillarry Junior Member Join Date: May 2008 Location: Ontario, Canada Posts: 24	Re: Cross Threaded Spark Plug Hole I'll find out tomorrow when I start the bike. Have to let the gasket sealant on the valve cover set for the night. The machine shop did a good job of rethreading the spark plug hole, but advised me next time it'll need a helicoil. I've read posts here - IN - Rich , OUT - lean...... or is it the other way around??
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