MOPED ARMY

Oh yeah when I said I think I might need to get a "slightly fatter needle" I meant fatter as in leaner-running, not fatter as in richer-running.

ok so to sum it up:

19mm phbg

118 main

w7 needle leanest setting i.e. the clip is in the highest position.

50 pilot? brass screw 1/2 turn out.

My 1st assessment would be to go with the 8 needle and try it in the one of the middle clip positions. In attempt to install a needle that isn't in one of the farthest clip positions.

I would not go with the fatter tips #10 just to be on the safe side for now (we all know how finicky polini is). One thing at a time, maybe if there is no difference between the 7 and 8 try the 10.

try to get the bike to run as it is now with the w8 with out needing to put it into the leanest clip position (ideally the richer mid slot)

now the bike hopefully feels good up to 7/8th throttle then it 4strokes. lower the main jet one or 2 numbers at a time till the 4 stoke goes away and the motor revs up to max rpms at WOT.

Be careful here tho there is a point where the motor will not respond any differently from 7/8 to wot (or still a bit faster at 7/8). This means your tuned up well but on the rich side, if you try to tune out this you might find yourself seized. I always leave my bikes a bit on the rich side, when u run hard the motor will heat up and be able to burn this extra fuel more efficiently after riding for a while.

as for the idle jet I like it a bit rich too, you don't want to drop the throttle too fast downhill and sieze cuz ur carb can't supply enough mix to lube up the kit at high RPMS when the slip is closed.

Overall take it slow and keep it lubed, only down jet more when you feel confident in the motor, you can still hit 60 at 7/8th throttle. Also watch out leaning the needle positions with a leaner needle, I have experienced a hard seize from a single needle clip movement.

Yeah, thats what I figured, too. Get the main right first. The problem was that I was running pretty lean with the 103 and I couldn't get up past 1/2 throttle at all without the engine wanting to die. So I started going up in jet sizes and my plug started looking a little better each time but I still couldn't get past 1/2 throttle. So when I reached 118, I thought I'd lean the needle one notch and then I was finally able to get to abot 3/4 throttle. Then I leaned it all the way and I was able to get to 7/8ths before the bike started getting rough and wanting to die. Thats what is leading me to believe that the problem is with the needle selection.

oh yeah and you were right, 50 pilot...

it is possible to run the mix screw a bit more out with a smaller idle I suppose but unless its really a big issue I'd just turn the mix screw out another 1/2 turn keep it a bit poppy and call it a day.

I'm gonna stick with keep it rich at least till after a couple hundred miles or so.

Also the mix screw and pilot jet do in fact effect wot and all positions to there given it might only be by a jet number or 1/2 of one it has an effect. keep that in mind if you decide to change the jet etc.

most ppl who jump into the PHBG game don't understand that the needle jet is very important and effects alot more than the main. its important to make sure its not running too lean.

I cleaned and set my points to the high end of the service manual specifications which is 0.018in (0.45mm). I started out with a 103 main jet. I'm kind of afraid to go any leaner than that. I mean, I could set my needle back to the 2nd richest clip setting and try to keep going down jet sizes until I can get past half throttle, but don't you think that 103 is already kind of lean for this setup?

I didn't say that you need to go down 103. Where the hell did you find a 103 anyway? Here Dell'orto jets only come in even numbers.

What I did say is that you need to find the correct jet. Go by feeling, throttle response and plug color.

If the plug is brown with jet 103, you can easily go down 3 sizes to a 100 and see what it does then :P

Experiment. Don't let it get too hot tho when trying out new jets.

your tuning issues are in the needle, not the main.

smaller jets is all i think is necessary