Need help with jetting. - Yamaha Raptor Forum
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post #1 of 11 (permalink) Old 02-11-2018, 09:16 AM Thread Starter
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Unhappy Need help with jetting.

Ok. Stock bore. I have the fmf power pipe and silencer. 160 main jet in the left carb and 165 in the right carb. DJ needles set on the 3rd position from the top. 25 polit jet. DJ lighter springs. Air fuel screws set at 2.5 out.

Starts up great. Runs idle to quarter throttle just fine. 1/4 to 3/4 throttle the engine wants to bog out or stall. 3/4 to full runs like a raped ape if i can get the rpms past 1/4 to 3/4 throttle. Ive done the 3mm test. My elevation is 700 to 1000 feet. How do i tell if i have a good accelerator pump that is located on left carburetor? Im just trying to rule out any extra problems..

What do i need to do..
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post #2 of 11 (permalink) Old 02-11-2018, 11:10 AM
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Originally Posted by FinksburgRaptor View Post
Ok. Stock bore. I have the fmf power pipe and silencer. 160 main jet in the left carb and 165 in the right carb. DJ needles set on the 3rd position from the top. 25 polit jet. DJ lighter springs. Air fuel screws set at 2.5 out.

Starts up great. Runs idle to quarter throttle just fine. 1/4 to 3/4 throttle the engine wants to bog out or stall. 3/4 to full runs like a raped ape if i can get the rpms past 1/4 to 3/4 throttle. Ive done the 3mm test. My elevation is 700 to 1000 feet. How do i tell if i have a good accelerator pump that is located on left carburetor? Im just trying to rule out any extra problems..

What do i need to do..
What is your intake setup?
Try needles 4th position. IIRC dj needles have 7 slots, with full exhaust and an open intake you need center or 1 position richer.

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post #3 of 11 (permalink) Old 02-11-2018, 11:22 AM Thread Starter
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What is your intake setup?
Try needles 4th position. IIRC dj needles have 7 slots, with full exhaust and an open intake you need center or 1 position richer.
Basically stock for intake set up
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post #4 of 11 (permalink) Old 02-11-2018, 01:08 PM
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If you can you'll need to open up the air box. If you don't ride in deep water, cut off some of the lid. If you have water, add a bunch of those 1in breathers available from ebay.

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post #5 of 11 (permalink) Old 02-12-2018, 08:10 AM
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Yep, 4th clip for needles and no air box lid
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post #6 of 11 (permalink) Old 02-18-2018, 04:33 PM Thread Starter
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Yep, 4th clip for needles and no air box lid
Still no luck
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post #7 of 11 (permalink) Old 02-18-2018, 06:24 PM
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Try turning pilot screws 3 turns out.

Did it get better or worse when you moved the needle position? If better, move it one more clip in the same direction. If worse, move it in the opposite direction. Its easy to get confused on which way is richer/leaner

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post #8 of 11 (permalink) Old 02-18-2018, 06:29 PM
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If the jets are DJ brand that sounds too rich. If you have stock porting, open air box, and full system exhaust then your correct DJ sizes would be in the 146 left and 148 right range. If you have Mikuni jets then you are close with the 160/165 set up. You have to get wide open throttle set up first. If it is bogging, it is most likely rich, you need smaller jets. If it is popping and backfiring when you try to go wide open then it is lean and you need bigger jets.

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post #9 of 11 (permalink) Old 02-19-2018, 03:26 AM Thread Starter
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If the jets are DJ brand that sounds too rich. If you have stock porting, open air box, and full system exhaust then your correct DJ sizes would be in the 146 left and 148 right range. If you have Mikuni jets then you are close with the 160/165 set up. You have to get wide open throttle set up first. If it is bogging, it is most likely rich, you need smaller jets. If it is popping and backfiring when you try to go wide open then it is lean and you need bigger jets.

I will try jetting down.. i have have both DJ and Mikuni jets. Right now I'm using the Mikuni jets.
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post #10 of 11 (permalink) Old 02-19-2018, 01:46 PM
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I will try jetting down.. i have have both DJ and Mikuni jets. Right now I'm using the Mikuni jets.
Id use the Dynojet mains with the Dynojet needles. DJ146-148 is in the neighborhood of a mikuni 160-165

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