MOPED ARMY

time for gearing and clutch adjustment, 16 front?

Im no guru either.

I just widen/port/etc try it, if its needing more, widen more, etc.

Try and get your compression ratio to 15:1

Get another pipe, bullets are not that " performance "

I had and others have 6p's on 50cc

Gear up to 16t or 17t as well, but if you think your low end sucks now, just wait till you get it up to a 17t

Lowering the intake was the same as cutting the piston skirt but you could go 2 more mm on that but it may slow your low end more. With 50cc you are always dealing with a low/high end balance and that you weigh exacerbates that dilemna. I checked the performance of a bullet and a Homoet 6p back to back on a hot 50 and the 6p was only good for about 2 mph more. If you were to do a compression test what would it come to? You could shorten the Bullet at the header and or the dwell section of the pipe for higher pipe RPM action. The header on these pipes extend 2 and a quarter inches into the expansion chamber. The 6p is about 2 1/2 inches shorter than the Bullet. An auxilliary center bleed welded onto the Bullet will help. Use maybe 45 psi or more if you have good tires to compensate for your weight.

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Ok, in all seriousness, you need your kit to rev higher. A great way to do that is by increasing the transfer window duration. The ideal way to do that is by raising the entire cylinder up by placing a metal gasket like shim between the case and the cylinder of the height you need the transfer to be increased by and shaving off the same amount from the top of the cylinder, thus keeping the same displacement but having much more aggressive timings.

Your problem is that you already have the exhaust duration maxed out and there is nothing to reverse that, save a new cylinder. It is not the best idea to hack away at the transfer windows, they _should_ be angled in such a way as to best promote cylinder scavenging and modifying them would not be beneficial to overall performance.

So:

Cut weight and re-gear!

My stator is all the way left. Full advance. Points are clean. A few days ago I put an 18t on the front and tested it. I noticed that it wouldn't wind up as high as with the 15t front, so it reached about the same speed. 41.37mph actually. And it was even more of a dog off the line. I know that a cdi would advance my timing more, and help with allowing proper ignition at high rpms, but I don't really have the money. Thanks for the great responses by the way, that is some helpful info. I think that my rpms are being restricted a lot by the pipe I have. Maybe if I got a better midrange pipe, that would let me regear and have enough power to pull to the higher rpms, but as is, it hits a wall. I have yet to check compression, but I will. What psi am I looking for?

CDI will not help you much.

It is logical that with higher gearing, you won't reach the same RPMs. With higher gearing, it's harder for the engine to spin up high. If you want super high RPMs, gear low. You won't go very fast, but you'll accelerate quickly, and really whine up there, because the engine has to turn more RPMs to get the same speed.

Blah, I'm drunk. Experiment with your timing more than simply running it at full advance. Timing is really a touchy beast, and the power is really in the points. Honestly, correct timing changes EVERYTHING. But yeah, you should be running at least 16x45, if not 17x45. The 50cc TCCD is notorious for shitty low end. You need to tune your clutch to at least TRY to compensate.

Bullet pipe is not ideal.

I have this kit with 16X45 gears and it gets about 45 with a 14 bing and a boss. I would definitely try the 16 tooth front if I were you. It still revs up nice and I doubt the low end would be that much worse.

You will definitely have to do some major clutch work too. Right now I have a two shoe with PAZ springs tightened as far as they will go. Even with this it still doesn't seem like the motor has enough power to rev up before the clutch grabs. I would recommend getting a three shoe with paz springs or lightening the two shoe.

This kit really is solid once you figure out the low end. Tons of fun in the midrange and revs to the moon. Seems like with a 16 phgb and all that porting you should be going faster but what do I know.

Sealed wheel bearings, chain tension, tire pressure, proper timing, 18x40, clutch tune, brake drag, air leaks and girl pants.

girl pants.

ies

girl drag

Bryan, but you didn't hit 50mph, so don't be fooling yourself and go for a jog and lay off the fast food.

if you have your stator maxed out on advance you need to set your point gap wider, that will have the same effect. on my 47 mph pinto i was running as big of a gap as i could without the points not closing at all, and the stator plate was about in the middle.

also, tiny pipes. a shortened header proma GP would probably be about perfect for a 50cc blaster, or a shortened techno BOSS. but yea, on the top end, bullet is going to be about as good as anything. when you really start scrappin' thats where the extra 1-2 mph come from. I had my plug side-gapped, my 16mm bing was bored with a taper, just about everything possible to grab an extra .1 mph here or there.

fat tires dont help either, the smaller and balder the tires, the less resistance.

mags are going to hurt you quite a bit from the extra drag on the 'spokes'

Nick, learn to use the space bar.

My gap is .018 right now.. Maybe .020? I'll try it!