What jet size? - Honda TRX Forums: Honda TRX 450R Forum
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post #1 of 11 (permalink) Old 06-15-2019, 12:42 PM Thread Starter
Tac
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What jet size?

Just got my 2014 trx450r back from the shop,it has 10hrs on the quad I installed a full monster exhaust, stage 2 hot cam,k&n filter & stage 2 jet kit the shop put the biggest main jet in a 140 & it runs like crap it sputters 1/2 the time around 1/4 to 1/2 throttle then clears up. Is the main jet way to small? Also when I put a k& n filter lid it runs worse what's up? Please help
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post #2 of 11 (permalink) Old 06-15-2019, 04:24 PM
CJM
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162, remove airbox lid

-2004 450R. Far From Stock.. Sold, crank was going
-2006 450R. New WHIP..
-Do it right the first time, and you wont have a problem later. Being cheap or taking the easy way out only makes matters worse later.
-Your Backyard Mechanic Extraordinaire: Responsible for bringing you redneck, ingenious and often interesting ways how to fix things.
-You can watch things happen, you can make things happen, or you can wonder what the H*ll happened. Captain Phil Harris
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post #3 of 11 (permalink) Old 06-15-2019, 07:41 PM
Making HP ainít free. . .
 
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If you paid this shop to do these upgrades and make sure it runs properly, take it back to them and hold them liable.
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post #4 of 11 (permalink) Old 06-19-2019, 07:28 AM
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First thing I would suggest as CJM said Remove the air box lid, they do not run for **** with the lid on with an aftermarket exhaust.

I think the reason Tac is on here asking is because he might be thinking the same thing as me.... If a shop didn't get test the bike to make sure to run right the first time working on it so it doesn't have to come back ... then clearly I wouldn't take it back to them because they probably wont have it right the 2nd time for all we know. Not to mention a lot of small business's buy kits like Dyno Jet and other off brand Jets that are measured different then OEM because they're way cheaper and you can get them in "kits". Sometimes you throw in jets and you get lucky and the bikes run fine.


What brand jets did they use? Do you know?
If it's a Dyno Jet brand or any other off brand jets that means their numbers are totally different then Keihin Jets or (oem Jets).
A lot of people get confused with this and causes a **** ton of tuning issues and head ache. Someone says "Use a 150 or a 160" for example but
what the person telling you that info doesn't know is that they're using DynoJet and the person doing the install is thinking "180" but really you
just installed a installed a bigger jet then you thought. That 180 is really equivalent to a 202 OEM jet.



There is absolutely nothing wrong if you used Dyno Jets, just make sure to use the converter chart when doing so. I'll leave a link for the
conversion



https://www.jetsrus.com/FAQs/FAQ_mik...ihin_sizes.htm

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Last edited by Ryan94Wright; 06-19-2019 at 07:31 AM.
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post #5 of 11 (permalink) Old 06-20-2019, 07:14 PM Thread Starter
Tac
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Quote:
Originally Posted by Ryan94Wright View Post
First thing I would suggest as CJM said Remove the air box lid, they do not run for **** with the lid on with an aftermarket exhaust.

I think the reason Tac is on here asking is because he might be thinking the same thing as me.... If a shop didn't get test the bike to make sure to run right the first time working on it so it doesn't have to come back ... then clearly I wouldn't take it back to them because they probably wont have it right the 2nd time for all we know. Not to mention a lot of small business's buy kits like Dyno Jet and other off brand Jets that are measured different then OEM because they're way cheaper and you can get them in "kits". Sometimes you throw in jets and you get lucky and the bikes run fine.


What brand jets did they use? Do you know?
If it's a Dyno Jet brand or any other off brand jets that means their numbers are totally different then Keihin Jets or (oem Jets).
A lot of people get confused with this and causes a **** ton of tuning issues and head ache. Someone says "Use a 150 or a 160" for example but
what the person telling you that info doesn't know is that they're using DynoJet and the person doing the install is thinking "180" but really you
just installed a installed a bigger jet then you thought. That 180 is really equivalent to a 202 OEM jet.



There is absolutely nothing wrong if you used Dyno Jets, just make sure to use the converter chart when doing so. I'll leave a link for the
conversion
Thank you it's a 140 dyna jet


https://www.jetsrus.com/FAQs/FAQ_mik...ihin_sizes.htm
thanks for the info it's a dyna jet
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post #6 of 11 (permalink) Old 06-20-2019, 07:59 PM
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Quote:
Originally Posted by Tac View Post
Just got my 2014 trx450r back from the shop,it has 10hrs on the quad I installed a full monster exhaust, stage 2 hot cam,k&n filter & stage 2 jet kit the shop put the biggest main jet in a 140 & it runs like crap it sputters 1/2 the time around 1/4 to 1/2 throttle then clears up. Is the main jet way to small? Also when I put a k& n filter lid it runs worse what's up? Please help



You need a 180 main jet or bigger..

This is same set up as yours pretty much.
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post #7 of 11 (permalink) Old 06-21-2019, 05:24 PM Thread Starter
Tac
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180 dyna jet or keihen
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post #8 of 11 (permalink) Old 06-21-2019, 05:25 PM Thread Starter
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Ps thanks so much for the help u r awesome
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post #9 of 11 (permalink) Old 06-21-2019, 10:23 PM
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Originally Posted by Tac View Post
180 dyna jet or keihen
keihen. Start at 180 and keep bumping up if you need to. I'm running a 200main, but I also have fci intake.
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post #10 of 11 (permalink) Old 06-28-2019, 01:58 PM Thread Starter
Tac
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Update got it back from my old shop only took 1 hr installed 150 dyna jet main jet & installed k&n filter lid runs great now! Thanks so much to everyone for the help you guys are great!
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post #11 of 11 (permalink) Old 06-28-2019, 06:58 PM
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Sign..dyno crap..


See they work but they are never as good a tolerance as hex keihin still jets. Im glad you got it sorted out at least.

-2004 450R. Far From Stock.. Sold, crank was going
-2006 450R. New WHIP..
-Do it right the first time, and you wont have a problem later. Being cheap or taking the easy way out only makes matters worse later.
-Your Backyard Mechanic Extraordinaire: Responsible for bringing you redneck, ingenious and often interesting ways how to fix things.
-You can watch things happen, you can make things happen, or you can wonder what the H*ll happened. Captain Phil Harris
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