stumped on jetting

[dirtycj5]

okay i went from haveing an air box to running an open filter
heres the spec. on the quad
fmf fatty and power core
rad valve
stock 34 pj

esr told me to try this to start off
165 main
65 slow
and needle in the middle
and it ran like crap

so this is what im at now
155 main
55 slow
neddle all the way lean
and at least it runs but not good

what you guys think can you point me in the right direction ohh yeah im pretty much alittle over sea level maybe 20ft thanks

[peeping TOM]

ran like crap where. i.e half throttle , , ful,, u need to be more specific...........

[DPR250R]

Your pilot seems rich...

Also... sometimes the needles get worn and it will run really bad... nothing you can do but replace it...

[330BigBoreR]

how do you find out the size of your carb because I am having the same problem and don't know where to start the numbers on mine are S65A2

[86 Quad R]

pilot seems a bit fat to me. may want to drop to a 45 or 48 and set the pilot screw.

set the plug gap to .018-.020. reset the needle to middle position and then do a WOT plug chop on it.

btw what needle are you running?


330BigBoreR,

if ya dont have the proper tool to measure the bore of the carb(mid throat). you can measure the ID of the small end and convert to mm and get an approximation.

[dirtycj5]

it run ****y on the low and mid and kinda clears up on the top
the needle is the stock one that came with the carb
ill pick up some pilot jets today and some fresh plugs and try it out
thanks!!!!

[2StrokeGod]

Try 160 main needle in the middle and a 48 pilot anyway that was my jetting with stock carb and similar mods at about 1800 to 2000 above sea level.

[EXtreme-]

Originally posted by 330BigBoreR
how do you find out the size of your carb because I am having the same problem and don't know where to start the numbers on mine are S65A2 an S65 is a 35mm airstriker

[dirtycj5]

went to the local dealer and he doesnt have the pilot i want so i gotta order so i will up date next week
thanks guys for all your help!!!

[dirtycj5]

okay i bought a jd jetting kit
this is what i got now this is what the box said to do
170 main
blue needle "i for got to get the number from it"
50 pliot
it started up and ran fine but i didnt get to ride it
what is the best way to check jetting besides a plug chop
can you use a air fuel meter to check?
and what is concidered low compression?
thanks!!!!

[wilkin250r]

Where in Hawaii are you?

[dirtycj5]

Puna side of the Big island

[wilkin250r]

Originally posted by dirtycj5
Puna side of the Big island

Hmm, not sure I can help you then. I'm headed to Kauai in a few weeks, but I'm not planning on visiting the big island.