Puch tuning newbie questions

I have a Puch maxi with a 60cc eurocylinder kit. I put on a techno boss pipe and a 15mm Bing. I did the case matching also. Moped starts easy and runs great at 3/4 to WO throttle. Can't seem to get the low speed and idle to work with this setup. I've tried all the needle positions on the carb. I have not put any air filter on it yet.

Should I get a better carb for tuning? A delorto perhaps? Any reccomendations for carb and intake for this project? Any other suggestions?

Thanks in advance, Mike

Re: Puch tuning newbie questions

Probably Fred /

You got to jet your carb. Rarely does a carb work with the jet it comes with. You need a jet range mid 70s to low 80s if you got a real bing carb with a. 217 atomizer.

You can't just slap a kit on and expect it to run good and not seize.

What is your setup.

Timing before jetting . What is your timing set at?

Crank stock bushed or aftermarket needle bearing crank?

Clutch stock or tuned?

Stock gearing 16x45 or what?

What is your head temp ?

Re: Puch tuning newbie questions

Mike Singer /

Ken,

I figured the jetting was good. The jet is just hi speed right and the metering pin controls the rest? I played with some differend jets and settled on a 72 for the 15mm bing I have installed. It is a real bing, not sure what size atomizer. Timing was set to stock. Crank, clutch and gearing all stock. No idea what the head temp is. I have ridden it to work a couple times, maybe have 50 miles on the kit. I have been babying, riding half throttle about 25-30mph. I ran it up to 40 once, but it sounds like it is really red lining at that speed.

-Thnsk,

Mike

Re: Puch tuning newbie questions

Probably Fred /

Ya it's a time bomb like I thought.

If you held floored for several minutes it would seize, lock up or grenade the crank out of the case.

So here is what you need to do

Time correctly ( gap points to 16-18 thousands, find top dead center and time with a light 16-17 degrees before top dead center. If you run cool then you can add timing.

Either rebuild your engine with a needle bearing crank (best thing to do) or up gear to 17x40 and loose your hi rpm pipe and get a lower rpm pipe like a circuit or Estroil.

Tune your clutch with thick springs or get a aftermarket one with thick springs.

Make sure your running a 15mm intake and 217 atomizer that way a 76-82 jet

will work with a metal metal mesh filter.

Absolute must nowadays get a trail tech head temp gauge and keep it under 400 degrees

Break in at normal moped speeds for 300 mi

Re: Puch tuning newbie questions

Mike Singer /

Ken,

sounds like you done this once or twice. I have done dozens of rebuilds of stock puchs, but this is my first attempt at performance upgrades. I am going to work on the gearing you suggested to get my revs under control and I don't want to take the motor apart again. I'll get another pipe for it also. Would the atomizer tube be marked? I only have a 14mm intake, I'll try boring it out or get a 15mm. I looked up the temp gauge, is that the $40 digital guage with a sensor you place between the spark plug and head?

Tx, Mike

Re: Puch tuning newbie questions

Probably Fred /

Ya and ya both you can get on treats

Order a clutch puller and kickstart springs

Re: Puch tuning newbie questions

Mike Singer /

I have a puller, springs I assume are for my clutch and from Treats? My other parts are on the way.

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