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A question of jetting
#144701
03/26/19 02:56 AM
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Joined: Sep 2015
Posts: 326
Qwazert
OP
Member L3
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OP
Member L3
Joined: Sep 2015
Posts: 326 |
My XT250 has an issue. When the weather was "colder" outside (0° to 10°C) she runs normally. Requires choke to cold-start and once warmed, performs admirably with little to none of that awful exhaust braaap that I detest.
With the weather warming up lately (up to 22°C) I find that she can cold-start without choke and once warmed up, that annoying braaap returns! I get a lot more backfiring when the weather is warmer, too.
To me....this sounds like a jetting issue. All of my other bikes need or needed choke to cold-start, regardless of the temp. I'm guessing that she's running too rich right now, but the question is can I correct this by tweaking the mixture screw or do I need to replace the pilot jet? I'm thinking the main jet is probably right...according to the manual, the stock Main is a #135 and the Pilot jet is #34. I guess I'll have to rotate my carb and have a look-see...
Last edited by Qwazert; 03/26/19 02:57 AM.
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Re: A question of jetting
[Re: Qwazert]
#144707
03/26/19 08:25 PM
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Joined: Oct 2016
Posts: 672
#brer15
Silver Member
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Silver Member
Joined: Oct 2016
Posts: 672 |
Sounds rich to me also. Whats your spark plug looking like?
2004 XT225 purchased new in October 2004 0 miles. Current miles over 27,000.
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Re: A question of jetting
[Re: Qwazert]
#144708
03/26/19 10:29 PM
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Joined: Jun 2013
Posts: 4,153
peejman
Platinum Member
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Platinum Member
Joined: Jun 2013
Posts: 4,153 |
Yep, sounds rich. You could remove the air filter for a bit and see how it runs with the extra air.
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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Re: A question of jetting
[Re: #brer15]
#144710
03/27/19 01:27 AM
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Joined: Sep 2015
Posts: 326
Qwazert
OP
Member L3
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OP
Member L3
Joined: Sep 2015
Posts: 326 |
Sounds rich to me also. Whats your spark plug looking like? Haven't looked at it lately but will soon...
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Re: A question of jetting
[Re: Qwazert]
#144725
03/27/19 06:35 PM
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Joined: Sep 2015
Posts: 326
Qwazert
OP
Member L3
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OP
Member L3
Joined: Sep 2015
Posts: 326 |
Is the pilot jet accessible without removing the carb?
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Re: A question of jetting
[Re: Qwazert]
#144758
03/28/19 07:48 PM
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Joined: Jun 2013
Posts: 4,153
peejman
Platinum Member
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Platinum Member
Joined: Jun 2013
Posts: 4,153 |
Is the pilot jet accessible without removing the carb?
Yes, you can remove the float bowl and access the jets with the carb on the bike. If needed, you can loosen the clamps and rotate the carb in place for a little better access. It's recommended to replace the bowl screws with M4 socket head cap screws for easier removal/installation with a ball-end allen wrench. err... you've got a 250, right? Don't know how easy it is there. I'd guess it's similar but I'm not sure.
Last edited by peejman; 03/28/19 07:49 PM.
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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Re: A question of jetting
[Re: Qwazert]
#144819
04/02/19 11:48 PM
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Joined: Sep 2015
Posts: 326
Qwazert
OP
Member L3
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OP
Member L3
Joined: Sep 2015
Posts: 326 |
OK...after spending the last 2 hours on this one, I've given up. I don't know how I'm supposed to "rotate the carb" when there is no room to rotate it! As you can see, there is frame and other stuff all round this one...it's very well protected...on BOTH sides. There is NO side that I can get at this one...period! At this point, I simply put it all back together. Looks like I'm going to have to live with that awful BRAAAAAP...or sell it. I miss my TW so much.........................
Last edited by Qwazert; 04/02/19 11:49 PM.
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