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Re: Air/Fuel mix screw pic? [Re: Wanabecruisen] #100903 08/15/12 10:01 PM
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Wanabecruisen Offline OP
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Confused??? I found my old hand held compression tester and ran a check with that. Only gets to about 75psi! Compression is very low but why?

It starts well, idles well(once warm), and runs fine through the lower gears. No smoke at all, no fouling on the plug, etc. Could the valves be so out of adjustment to give these kind of readings?


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Re: Air/Fuel mix screw pic? [Re: Wanabecruisen] #100904 08/15/12 10:09 PM
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alexd Offline
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Originally Posted By: Wanabecruisen

It starts well, idles well(once warm), and runs fine through the lower gears. No smoke at all, no fouling on the plug, etc. Could the valves be so out of adjustment to give these kind of readings?


Not likely, without problems starting too.

While you're at it, change your oil as more than usual contamination might be occurring. I recommend Mobil One 10W-40 or 0W-40, automotive types.

Alexd

Alexd

Last edited by alexd; 08/15/12 10:12 PM.

(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
Re: Air/Fuel mix screw pic? [Re: alexd] #100905 08/15/12 10:24 PM
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Wanabecruisen Offline OP
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Nevermind. I doubted the accuracy of the old compression tester so I devised a test. I used the known pressure from my air compressor and checked it against the gauge. WAY off. I'm going to toss this tester and build an adapter for my good tester. I'll report back again tomorrow.


Old Berzerker
Re: Air/Fuel mix screw pic? [Re: Wanabecruisen] #100922 08/16/12 06:45 AM
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alexd Offline
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There are compression tests, and leak-down tests. I believe compression tests are preferential to warmed up engines (and oil).

Alexd


(one) 2006 XT225, (two) 2005 XT225, 2006 FZ1
Re: Air/Fuel mix screw pic? [Re: alexd] #148306 06/24/20 12:56 AM
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Kenny4 Offline
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Originally Posted by alexd
Here's another; the plug was pre-drilled, as the owner will be inserting a screw to "grab" the brass and allow pulling the thing straight out.

When you do this, be sure to not drill in too far, which would gouge up the adjustment needle within.

Alexd

[Linked Image from i1085.photobucket.com]


This is right in the middle of the 3 aluminum openings and facing down to the ground right? Is it part #34-35 on this chart and if so how would you get a drill bit in there without removing the carb? Any vids showing how to do this without removing the carb? Thank

OEM Carb Parts

Here's a vid I found, ( but with the carb removed )

Cap Removal

Kenny4

Last edited by Kenny4; 06/24/20 01:05 AM.
Re: Air/Fuel mix screw pic? [Re: Wanabecruisen] #148308 06/24/20 11:34 AM
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peejman Offline
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Yes, its the brass plug in the boss that faces down. There may be a very small hole in it already. You can loosen the clamps and rotate the carb in place without removing the throttle cables. Rotate it about 45 deg and you can get at the plug to remove it.

[Linked Image from photos.smugmug.com]

Last edited by peejman; 06/24/20 11:41 AM.

This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
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