dune porting jetting

[rocketboy]

i just got a new 18.6cc head and a dune portwith klotz technaplate at 40-1. my bike seems to flood out on top and im currently running a 155 main/55 pilots in my 30mmm kehins ,basically the plugs look right on ,but it power fades out on topend only not sure if its because im running staright 94 octane or what ,its not detonating at my elevation(1300ft) and portwork ,but it just is nt hitting the high notes ,ive tried going up n the mains and it gets worse im thinking my fuel isnt burning right and flooding out on top.my timing is +3-4 degrees . im going up and down on main jetting and nothing helps. the bike used to run great now on top it acts very odd and fades out in 5th -6th,my compression isnt really that high; only 150 :confused:with new topend wisecos. i cant seem to jet the topend right ,no airleaks apparent and im assuming timing is right will running pump gasvs 100+_octane affect this problem ? has anyone experianced this problem like me?thanks :cry:shoulda put this in jetting im thinking,,but it is after mods and repairs too

Edited May 15, 2005 by rocketboy

[wesw]

with 18 cc you should have way more compression

 

i have 20 in 900 ft with 180 psi

 

you might have a ignition thats going weak on the top end. might try a dyna system

 

i run 100LL

Edited May 15, 2005 by wesw

[wayfst]

cdi box failure??

[ssanddemon]

How's the plug chop look?

[FadedDreams]

I would say your rich on the main.I went through the same thing when i started jetting mine.Plus i would say you would be needing higher octane considering the cut head,plus your timing increase.

[FIRST BANSHEE]

what condition are your reeds in...if there hanging open you won't be able to rev as high. it also could be a week ingition, but that would cause the plugs to look fouled.

[rocketboy]

155 plugs looked atad rich when i cut the threads off and the base was dark still,went to 150 mains 55 pilots ,looks better on the plug, except plug stinks bad so i took tank off and looked down the holes at the piston and such and it looked all black wet and loaded up from my jetting experiments i presume some of which had me in the 185 range for a while till i realized i needed to go down in size exhaust and jugs arte really loaded up with oily mung and im going to throw some b7es is there and see whats going on wit hmy stinky oil y problem im going to run race fuel even though i can see it will run without it ,my compression tester is a wally world special so i use it mostly to check equility of comp.delta2 reeds look good,carbs have been cleaned nothing to wild going on i guess its just loaded with shit and needs a good long run at high rpm with freshh clean race fue lthen ill do some more plug tests....thanks for replys guys

[FadedDreams]

I'm not sure how close you are to Heilwood,Pa.But in July theres gonna be a dyno at Quadfest.Its the 15,16,17 of July.He has the equipment to check your jetting.I plan on going on Saturday,so i can watch the drag races too.Heres the site if you want to check it out.Heres a price list if your interested:

Prices:

Set-up Fee:$25

A/F testing:$20( consists of 3 runs)

If you want to do A/F testing

Dyno Run:$10/run

Tires:$10

If you want to use slicks

You have to register if you plan on going,through the Quadfest site.And if you want to make sure you get a place for the dyno,pm MobileDyno on paatving.com and he'll get you set-up.

 

 

 

 

Quadfest