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strikz_05
50cc nipper
Joined: 12 Nov 2008
Posts: 39
Location: Perth, WA
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 Posted: Mon Mar 09, 2009 10:32 am Post subject: Jetting my 2007 honda trx250ex quad |
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I was just wondering if any1 can help me with putting a jet in my bike. i have a 105 main to put in and i just need to no where it goes and how to do it. i have 2007 honda trx250ex cheers guys
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4stroker
Joined: 15 Jan 2007
Posts: 1420
Location: North Queensland
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| Posted: Mon Mar 09, 2009 4:23 pm Post subject: |
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why are you changing the main jet? what is in it at the moment? will 105 be richer or leaner?
have you changed the exhaust system or removed the air box lid or simlar?
i dont know much about trx250s, but a 105 sounds like a keihin main jet. you should be able to loosen the intake boot and airbox boot, and spin the carb around so you can access the float bowl bung. remove that (17mm spanner), and with a 6mm socket you will be able to remove the main jet. screw in the new one and away you go.
BUT why are you changing it in the first place?
also this and your other thread in here should be in the technical section.
mark.
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strikz_05
50cc nipper
Joined: 12 Nov 2008
Posts: 39
Location: Perth, WA
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| Posted: Mon Mar 09, 2009 4:26 pm Post subject: |
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iv pt a full system on and a K&N air filter and it is backfiring so honda sed that this 1 woulb be best and so did my mate whos a motorbike mechanic
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4stroker
Joined: 15 Jan 2007
Posts: 1420
Location: North Queensland
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| Posted: Mon Mar 09, 2009 4:29 pm Post subject: |
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whoever made the exhaust system should be able to give you jetting specs to suit.
get your mate over and play with the jetting. may need to adjust the needle position and pilot jet too.
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strikz_05
50cc nipper
Joined: 12 Nov 2008
Posts: 39
Location: Perth, WA
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| Posted: Mon Mar 09, 2009 4:35 pm Post subject: |
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ok i was gona do it 2nite so how do i tune it rite
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The Day Starts With OZATV !
Joined: 09 Sep 2006
Posts: 1518
Location: Middleton SA
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| Posted: Mon Mar 09, 2009 11:45 pm Post subject: |
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Throw the 105 main jet in and try it.
I can't remember the standard size, but hopefully the 105 is couple of sizes bigger.
Simple test is if it revs up quick when cold without the choke when cold, and pulls ok without choke when relatively cold.
If it flatspots like buggery... you are still too lean, so don't hammer it around until you have someone with a fair knowledge have a look at it.
Out of curiosity, what was the std main jet size?
Like many enviromentlly friendly little Hondas, the std jets are often quite lean and it takes a while to get them off the choke anyway.
So even stock, they respond well to going up one jet size.
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strikz_05
50cc nipper
Joined: 12 Nov 2008
Posts: 39
Location: Perth, WA
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| Posted: Mon Mar 09, 2009 11:53 pm Post subject: |
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itas orignaly a 98 main jet bt because im running a K&N air filter and a full pro ciruit T-4 system it needs to b bigger coz it backfires like a bitch
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The Day Starts With OZATV !
Joined: 09 Sep 2006
Posts: 1518
Location: Middleton SA
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| Posted: Tue Mar 10, 2009 12:09 am Post subject: |
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Ok
The 105 should be a minimum but good start point.
I would not be suprised if a 110 is the go.
98 to 105 is only 1 1/2 sizes up and I'm sure a stocky would not run 'too' rich on a 105.
good luck.
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