hi folks

ive got a strange problem with my bike in the 3/4 to full throttle range. Its strong at low openings and mid openings but splutters and surges under full or near full throttle. It also blued my dyna pipe really badly. ive always had this problem but it never bothered me because i rarely used to use more then 1/2 throttle, and since i cleaned my k&n filter the problem has worsened.

Before i would get this at about 1/2 throttle, but i raised my float height (because it was too low), went from a 165 main to a 177.5 main and moved the circlip up to the middle ring because the midrange went to rich,  and cleaned out my carb with carb cleaner and compressed air.

ive also ran some carb cleaner in the fuel, current jets in sig

any suggestions before i move to yet another bigger main jet??

Are those mikuni  or dynojet  main jets your using?

thanks   i am using genuine mikuni jets  the large round type.

the reason i say think i am lean is because the inside of the pipe has no carbon on it at all and the greased brake arm which is near the opening of the muffler also is not blackened

when i had a rich midrange and a still lean WOT, after a ride i would see that my brake arm was blackened with soot but the exhaust was not, so the only explanation was that the rich midrange made the soot and the lean WOT burned off all the carbon in the pipe. raising the circlip fixed this but im still left with a lean full throttle.  

when i cleaned my filter I poked my little finger in and it it the slide smoothly went all the way up and down     will post a pic of the jets im using

man that's why I was asking about dyno's vs. mikuni's - the dyno's run roughly 10 numbers higher for the same size jet - what you are using seems far too big - 152.5 here at sea level with a freer flow exhaust on a '95 and 155 on '02 w/a cam and near open supertrap pipe

good one   ill pull my choke a little when its surging   i guess ill just have to hold on tight with my right hand.  

yep the washer is under the main jet

just to make sure, the white spacer goes on top of the circlip, and the spring goes under. right?

jabman wrote on 04/19/10 at 10:39:10:


yes on the spacer placement - see here:

http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1098869...

- of course we only a single place for the c-clip

are you sure it's stock needle?

and do you have single diaphram/slide spring or a two piece with a plastic plug between the two?

i will check to see what numbers are on the needle   my bike has had 11 owners and the carb screws were already chewed, so that may be the case.

i haven't separated my diaphragm from the slide i don't think, looking down on it it looks like there's a big round white ring on top of the slide