I bought Mikuni jets and the head of them doesn't fit in the tube the old ones went into, do they need that tube or can I just screw them in and put my carb back on.....thanks
That's good to know, was beginning to think my bike was a one of a kind fluke or something.Raptorstock - you're running the huge mains because you still have stock needles. With aftermarket needles (DJ, GYTR, etc.) you'll be down at 160 left, 165 right Mikuni mains, and transition across the full throttle range will be much smoother.
Typical suggestion for an open airbox is 160L/165R, aftermarket needles 1 notch rich of center, 25 pilots with screws at around 2 turns out.
I have the same problem with a similar setup and would also appreciate an answer. Any information about how to choose the right needles, if i need aftermarket needles would be great too.what should i jet my quad i have a dg full system with uni filter..and cuts out should i got one size bigger on the main jets in each carb?
So it's running lean. If only at full throttle up the main sizes. If also at part throttle raise the needles.Its bone stock except for a White Bros R4 exhaust system. Stock intake with lid and snorkel. I think the jets are stock but i dont know for sure. The quad runs perfect up until 4th and 5th gear and then it loses all power and backfires sometimes. Then i have to shut it down and let it sit for awhile.
We got your old pipe on and just about got the jetting right ...pipe sounds great and the power feels good so far I'm going to change the jets again and mod the air box..2004 Yamaha Raptor YFM660R
Location : Indianapolis Indiana
Elevation: 799 ft.
Intake Mods: No lid w/ Uni filter and pro flow adapter
Exhaust: White Brothers MX4 Slip on that I packed the same time I jetted
Porting/Engine mods: Stock
Jetting: #25 for both pilots, 160/165 combo Dynojet mains,
Air Fuel screws: were left in exact position I found them in which I would assume is stock
Needle: Dynojet needles @ 3rd clip (middle)
Update: Bought a DMC Alien dual exhaust and headers are glowing red after a 20 minute hard ride. Will create a new setup for that to show differences when I figure out the difference.
I may have to try this.. only thing I didn't do was matched the intake boots...would aftermarket boots match the ports?
Elevation-close to sea level
Jet type-Mikuni mains/Dynojet needles
Intake-Gytr,Gytr foam filter,No lid,port matched intake boots
Exhaust-Trinity stage 4
Fuel screw-3 turns
Needle- 5th slot closest to the taper
Clear tube method float level adjustment with freeze float mod.
It finally runs good,still not perfect.I do not know why I have to use such huge jets and such a rich needle setting but thats what it takes to get this thing to run. The plug is a light to medium tan.
all aftermarket needles are prolly pretty close to each other...i think some had 6 notches instead of 5.... i highly doubt switching needles from say vitos to alba would make a noticalbe diff in HP........ i think alba used dynojet needles or vise versa anyway....I may have to try this.. only thing I didn't do was matched the intake boots...would aftermarket boots match the ports?
Anyone know the difference from dj and alba needles?
Even with aftermarket needles you ran 180-185?mess around with the jetting.......i ran no air box, stock head, stage one cam and barkers.... with stock carbs, i ran like 180-185 mains.......it seemed to run the best with big mains.....