MOPED ARMY

Looks like regular carbon buildup to me.

If it’s breaking up like it’s completely missing don’t rule out electrical.

If it’s more a rich 4 stroke noise where it goes Brbrbrbrbrbrbrbr like it’s missing every other stroke then try to move the needle clip up.

This will then position the needle further down into the atomizer, which means it takes more throttle pull till you get all of the gas from your main jet.

Needle controls not just how much, but also when you get your gas. If you want to lean out your mid range you have the get a needle with a thinner diameter. They are separate into class by tip diameter. Moving the needle down does not really make it any richer, you just get the gas sooner relative to throttle position.

This photo helped me a bunch. I wish it was complete and had every needle but these are common ones. Dellorto has a chart that lists the dimensions of all of em, but I like pictures

(edited)

I run 264 atomizer 100 main jet and neutral needle position with k&n filter and estroil pipe but I run true rubberized 4 pedal insert in polini cage not crappy 2 pedal

I have ran 262 atomizer, 100 main but then I had to go one rich on the needle

You didn’t say if you we’re case matched, What air filter You’re running, what oil, what your head temps are,

The more info the better, and really if you’re only going 48mph with a expensive kit, head, pipe and carb really you could do that with a 69$ kit and a 14 mm Bing

That is the worst dremeling/porting of the intake I’ve ever seen in my life and you shouldn’t do any of that until the kit Well is broken in

70to1 is for a Weedwhacker, saber sucks over 50 to 1on a real engine, you should go with a 8 range plug,

I can’t believe counting the HPI you probably spent near 700$ plus to get 48mph !

I almost wish all these people Like you that were spending way too much money to make their bikes go marginally faster lived close to me,

Polini kit, intake that compression with stock un rebuilt bottom end, polini kit, free maxi head, 14$ metal mesh filter 15mm bing mm carb, estroil pipe, Tomos reed plate, thick kickstart springs, 17×38 gearing,

Video was many years ago and I rode the bike yesterday and it even went faster after all these years, it stills hit Ps near 60 mph withgreattake off and still has the 40 year old original clutch!

Man so many people are wasting so much money! I don’t understand why people go with HPI, high rpm pipes, Big carburetors, polini cage, race cranks and all that crap to go 48mph, I don’t have none of that, Come over and you’ll see I’m telling the truth

lol

Aiming for a "70mph all day" bike is not the same as actually having one (unless it's a Tomos in NJ.) The gulf between a 50mph moped and a 70mph moped is vast. A reliable daily 70mph bike? Ok prove it.

Don't worry about Ken tho. He's set in his ways. He has a good point but it's pretty much the only point and he tends to make it on every thread so don't take it personally.

Also... fast parts don't always mean fast bikes, as decades of forum posts here can attest to. (edited)

Based on that carbon buildup I'd stop running such a rich premix and maybe go one hotter on the plug? After checking the needle adjustment mentioned above of course. Once change at a time :)

Double post, delete

The carbon on the piston like that is no bueno, it's not running right. It's good you stopped before blowing it up. Either your timing is too advanced, too rich, your case seal is sucking in oil, or your squish isn't setup right

I like to run my polinis hot hot so they'll will build up some black carbon on the piston face but it's thin and dry, when you are seeing that thick wet oily deposit it's either because you are running too much oil or the tune is off.

Do you have a head temp gauge? Probably a good idea.

Again, where’s that 15x42 bike that’s going to blast me?

If you want to see some dumbfounded looks , ask them to order some Ruthenium HX plugs from NGK . ;)

I was still braking it in, hadn’t really pushed it much into the big end. Tomorrow is supposed to be decent. Let’s see if I seize it.

All your screenshots prove is that you have gps on your phone.

It sure seems like you have something to prove, but you mainly look very butthurt.

It's entertaining , at least . ;)

That’s some weird goo looking stuff on the piston. The wash looks good but the substance we weird.

I run saber at 80:1 and swear by it despite what anyone says. I’ve seized countless kits on other oils but that saber is a magical snake oil.

If you’re gently rolling of the throttle I’d speculate you’re hearing a lean condition as you get in the pipe. Very common with a single speed kitted bike with a pipe. Try moving the needle so it’s richer. It’s trial and error. It’s progressive tuning. Once you get that better and the kit broke in and start going wide open to adjust your main you’ll have to come back and adjust your needle more.

Trial and error, just try stuff and watch the temp.