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Re: Bogging problem [Re: Andy74] #145250 05/12/19 02:53 PM
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Andy74 Offline OP
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Also starts and idles really good

Re: Bogging problem [Re: Andy74] #145252 05/12/19 05:56 PM
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skypupbob Offline
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Try raising the needle a notch [ lower the e-clip ] if that helps then go another notch. It can't hurt, and if it's worse then you can go back.

Re: Bogging problem [Re: Andy74] #145255 05/13/19 03:18 PM
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peejman Offline
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Ok... if 130 is stock I'd also suggest raising the needle a notch. Another trick is to remove air filter cover for a quick ride. If the extra air makes it better, you're too rich. If it's worse, too lean.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: Bogging problem [Re: Andy74] #145258 05/13/19 06:53 PM
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Andy74 Offline OP
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Tonight Iíve tried 127.5 jet with needle 2 notch and 3 notch from top in neutral revs but bogs at full revs tried filter in and out still same should I try same with 130 jet or go more notch down
Canít believe how hard this is to get right lol
Help please
Also mixture screw is 3 turns out

Re: Bogging problem [Re: Andy74] #145270 05/14/19 04:11 PM
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peejman Offline
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If the 130 jet is stock and the bike has mods to increase airflow, then you need more fuel to go with the additional air. The typical experience with these bikes is they're not real sensitive to needle adjustments, the main jet size tends to have a much larger influence.

Float height also has bulk effect on mixture. Higher fuel level in the bowl will cause the bike to run a little richer.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: Bogging problem [Re: Andy74] #145323 05/16/19 09:43 PM
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#brer15 Offline
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OK, I thought I remembered something strange about the 130 main jet. So I went back and checked my carb rebuild thread.
( A great aspect of the forum, you can reference little personal tidbits of info cool )
Although the manual states that stock main is 130, mine had a 125 in it. And I'm the original owner. The kit I got also came with a 125, although I opted to not use it, as my original was fine.

Little confusing to say the least. Is it possible that 130 is a misprint?


2004 XT225 purchased new in October 2004 0 miles. Current miles over 27,000.
Re: Bogging problem [Re: #brer15] #145332 05/17/19 07:03 PM
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peejman Offline
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Originally Posted By: #brer15
OK, I thought I remembered something strange about the 130 main jet. So I went back and checked my carb rebuild thread.
( A great aspect of the forum, you can reference little personal tidbits of info cool )
Although the manual states that stock main is 130, mine had a 125 in it. And I'm the original owner. The kit I got also came with a 125, although I opted to not use it, as my original was fine.

Little confusing to say the least. Is it possible that 130 is a misprint?


Or Yamaha changed it from a 130 to a 125 somewhere along the way and the service manual wasn't updated...

When did the emission and/or fuel economy reg's change? That would prompt the jet size reduction.


This shall pass, be still and know.
2006 XT225, UNI filter, ProTaper bars, MSR handguards, SS front brake line, Shinko 241's.
Re: Bogging problem [Re: Andy74] #145336 05/18/19 01:10 AM
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Selden Offline
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Carburetors can be frustrating, and what works for one bike may not work for another, seemingly identical model. I have a 2006 U.S. spec. XT225, with the Z1 muffler mod and about a 1" x 0.5" hole cut into the top of the air box just outside the frame rail.



Idle screw is backed out 1.5 turns. 127.5 main jet. I have measured the float level, and it's where it should be.

Most of my riding at ~1500-2500 foot elevation; the engine pulls strongly at all revs, and given enough of a straight, it will will hit 80 mph (at which speed the chassis seems definitely wiggly). The previous owner took it out for a spin last month, and was surprised by the power difference from stock, especially above 5000 rpm.

Of all the suggestions to date in this topic, I like checking the float level best. Idle screw shouldn't have much effect on WOT, but it's worth checking. My second favorite guess is that the needle and/or the tube in which it slides may be worn, especially since it's a 1993 model. How many miles are on the bike?

The classic way to test main jet size is a "plug chop," something that is easy to do with a single cylinder engine : Put a fresh plug in a warm engine, go as fast as you can with a wide open throttle run, pull in the clutch, and hit the kill switch. Coast to a stop, pull the plug and look at it.



Source: https://www.motorcycleforum.com/59-motorcycle-repair/116976-spark-plug-chop-comparisons.html


Don't fix it if it ain't broke, don't break it if you can't fix it.
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