At what sort of revs/power are you rolling off the throttle?  Roll-off is a useful test for main jet at ¾-full throttle with a few revs dialled in.
When you roll off (from smooth full throttle acceleration to, say, 7/8 throttle), the tendency is for the mixture to richen a little, so if she actually ‘gains’ when you roll off that means you were too lean and can go up a jet. If the motor is unhappy at roll-off (as your seems to be), you were probably too rich anyway and should drop in the smaller jet.

3 jets is a big jump for a muffler and de-snorkel – I suspect you’ll have a happier bike with the 150.

Half a spacer shouldn’t be far off.  As for the idle, have you uncovered the mixture screw and adjusted it?  Raising your needle shouldn’t affect idle speed too much, but it can affect idle stability on roll-off.  

To set idle mixture, best to have the bike ticking over slightly high (just turn the idle screw to give the motor a couple of hundred revs more than normal idle).
With the idle speed set a little high, turn the mixture screw by ¼ turn at a time until you get the highest variation engine speed (maybe just a perceptible change in tone for 20rpm or so) – turn left until it starts to drop and note where it is, turn right until it starts to drop and note that also, then set the screw midway between.  When you’ve done that, set your idle speedback to where you want it.

With that set right, she shouldn’t stall.

you doing the normal things 1/2 the spacer is general good - maybe a little less, 3 jets is a big jump if you weren't lean to start with from the factory - the 150/152.5 is a very good place to start - soft seat the mixture screw and come out 1 3/4 turns should have you in the ball park - small adjustments from there - if you a flooding out bad it's something else -

you did have washer under the main jet didn't you? - pretty easy to drop the thing - then it's flood city for sure  

the slide was as clean as clean right - no oil no nothing?

eanon wrote on 03/29/08 at 13:15:06:


ok place to start on the spacer - dang if we only had multiple groved needle stinkin EPA!

anyway .... you should be close - that slide can get real nasty if dirty or it was oiled, or the big spring wasn't straight, or the little tab wasn't in the slot and such

that washer holds the needle jet tube in place with out it the tube will jump up and you end up with an jet about 1/4" wide - not good!

Well, she runs like greased owl sh!t now.  The rpms still dropped pretty far when pulling the clutch to stop, though I don't know how far because now my tach isn't working!  Ah, the joys of the DIY mechanic.  Should be a quick fix, atleast.  (loose wire)  Thanks for the input!

So she stalled a couple of times on the ride.    When shifting through gears, she runs GREAT!, but when I come to a stop, the rmps drop by at least 500. (had the idle set around 1100, came to a stop, watched my tach drop to roughly 600, then dead)  This happened every time I came to a stop. Didn't always die, but came close!  If she didn't die, the rpms smoothed back out to 1100.  Thoughts?

yeah, a couple times when shifting. (ie -  rpms drop for a second)  none on shutdown, though I haven't had any on shut down for a while.  Will try to tweak the mixture up a little.  Thanks, Reel.   Best way's to adj. the mixture screw while watching my tach for the highest rpms, then set idle screw accordingly, right?  or is it just trial and error?  tweak then ride, so to speak.

tach will get you very close - then at least for me it's trail and error - I know I sound like a broken record - little adjustments 1/8 one way or the other and ride a bit - tweek it a bit a more and such - if you have the time, a place to do it, and half dozen on the cheap spark plugs you can do the ole plug chop to find high,mid,low range spot on