MOPED ARMY

Unlikely unless you increase airflow.

Yes, very minor..can go for power takeoff at the cost of top speed, or top speed at the cost of takeoff power.

Very much gain, and it does tend to lean out the mix so jetting richer is reccommended.

Combined with the sprocket, it should get you that 40Mph you're hoping for.

Best ask someone else on that, imma Tomos expert, mostly...tho I like Puch too.

Never did an airbox mod on one, however.

Not reccommended, especially for beginners...ask around, you'll see.

Now, I don't recall offhand how it is done, but I know some of the forum members do - but there's a "Conversion" procedure for changing the 1.5HP Puch models into 2.0HP models, which isn't all that hard, far as I understand it.

My suggestion would be to go with the BiTurbo pipe and a richer carb jet, and the sprocket, along with the 2.0HP conversion, realistically you'd get anywhere from 40-45mph out of it, and that's all you really dare to grab for on a ped, especially as a novice owner.

-R

order the pipe from <www.mopedwarehouse.com>

i got my biturbo pipe for $70 and they knew exactly what jet i needed. An hour of install time and it's a total difference.

as far as the sprocket goes. I would say try the exhaust first. And then if you still aren't happy, go with the new gear.

I have a 1980 yamaha qt50. I can get it up to 28 ish. I have the same question Phil had. Is there any specific things i can do to speed up my moped. or would i do the basic same things. Where would i take this stuff to be done because i am not an experienced mechanic. Is it easy to do?

I've decided to get the proma pipe for $85 from www.themopedwarehouse.com

I took a look at the jet # in the carb last night #56, damn that thing is tiny...could that be right? everywhere I see people mentioning jets in the sixties

Phil,seems I remember Puch always using a higher than average jet number. I remember something like average numbers being 62 or more. Maybe Ike or some Puch expert will answer you.

Sounds like maybe the #56 is for 1,5 hp and the #64 is for a 2 HP? I am pulling over 3hp,I'm sure now with a #64 jet. But that's on an Italian engine kitted to 60cc., X-Brand.(The specs say it's a 4.2 hp kit.

Brandon,

Fuel, to a ped, is a mixture of gas and oil. The main jet regulates the flow of gas into the air stream passing through the carburetor at full throttle, but it is only one factor. Some others are the level of fuel in the float bowl, the pressure differential between the float bowl and the carb venturi and the design of the emulsifier (how much air is mixed with the fuel in the emultion tube).

I don't know about Puchs specifically, but all of the above and I'm sure, some other factors can change the required main jet size.

Hope this helps,

Ron

Hey guys thanks for all the great help!

Do you think that I will have to monkey with the air box (drill extra holes or replace) in addition to the rejetting after I put on the proma circuit pipe? The existing air box only has 540 miles wear on it.

What would be the symptom of the engine needing more air?

How many holes do you make if any?

I checked the archives and found the info to do the plug chop to check the jets. Might be hard in my neighborhood, I get to a stop sign before I get to top speed, in any direction I head.

35-40 MPH to and from work and tooling around...I am in the city...not much room to roam

Hey about about this for the plug chops: since I'll never get to top speed before hitting a stop sign, do them in my garage with the door open. I'll have someone I really trust hold the back of the bike off the ground (legs spread wide), as I stand to the side of the bike to work the throttle, kill switch and brakes? This way I can get to top speed for each jet and do it faster as well. Is this risky and dumb? Does the moped have to be under a load (my fat ass, friction etc..) to test the jet accurately? Sounds like a ridiculous question, but with such a small engine, I dunno.

thanks, yeah that makes perfect sense.