MOPED ARMY

wow. good point. i'm gonna try loosening the intake a bit

thanks for sharing. any other ideas?

i was going to check the needle next. i think i'm at the stock position of second from top. i was going to move one more in to second from bottom.

i think everything is running fine, "pre seizing" = running really fucking fast cuz its a bit lean and then bam u seize. too lean with a phbg, sounds like its gasping for air and will generally happen when you give it throttle at certain positions.

polinis sound super dodgy when they are 1st installed u will get used to it.

why would you want to loosen the intake...? that sounds like a horrible plan,and quick way into air-leak town...

I doubt that's your problem...

play with your needle. make it a bit richer, and see what happens... don't loosen your parts for performance lol they'll do that enough on their own...

Don't just willy nilly loosen the intake, but pull it off, inspect your gaskets, and torque it evenly and snug using a criss cross pattern.

ok...good point about blindly loosening the screws...will try richer needle setting first.

michael, i think i understand what you're saying about the oil mixture ratio. yes, technically you're leaner with more oil in the mix, but i wouldn't think too much oil in the mix would cause a cylinder to seize, as the gas you take away is replaced with lubricating oil so i was thinking that that shouldn't be a reason why the piston felt resistance and closer to seizing.

i guess more fuel and oil makes sense which is why some guys run such big jets. i think i'm going to 107 now. ha.

just a note about the intake... you should check when you take it off to see if it is perfectly flat... if it was already overtorqued and has been sitting like that it is probably slightly concave and therfore fucked no matter what the tightness is.

You can take a piece of glass or if you have a perfectly flat metal shop table and put some 320-400 or so wetordry sandpaper on there and mill it down evenly until it's flat.. then go to 600 grit for a second, then 1000, that should be good. It will be really really shiny and you should barely be able to see any scratching.

Might help?

Nils has pointed out that those polini reed cages are not flat out of the factory. I would add some Permatex aviation grade sealant also

not a bad point fubaman.

i have a 64cc malossi for my vespa grande and i run that thing very hard. wot on 95 degree days, no problems for 2500 miles.

i have to spend more time tuning the polini and understanding how to tune the dellorto phbg, but still, the kits shouldn't be breaking this much/so easily.

yes, i think we all know that the polini is a very fast, sensitive kit. it has been said many times that it needs to be tuned correctly. however, i don't really believe that designing a cylinder to be both fast AND reliable should be mutually exclusive.

I also acknowledge that they were not designed to work with such big carbs (19, 21 mm phbg). but i hear that they seize occasionally with the smaller bings too.

i like the puch polini, hard seized mine once, just from moving the needle one notch tho. it is very unforgiving. I have also soft seized 2 others on other ppls bikes as well but no real damage occured.

I have run it really hard at wot for miles on end, and its been the most reliable moped i have ever owned.

Its a 4 pedal 19 carb setup, and heavily ported, it revs out higher then most other ppls polinis.

Polini makes a great kit, and i have seen many ppl seize them, its like popping ur cherry in SF, u can't say shit till u seized a polini or 2 lol.

also about the 80 kits ppl seize those all the time as well (just as often as polini), but u just don't hear about it as much since they have only recently become very popular, and alot of ppl don't like to "brag" about how they seized there $350 kits to everyone on MA.

The most forgiving kits are the tccd kits, malossi kits, and metra 65's, and also the less powerful kits

athena reed kit is good, pretty forgiving to tuning mistakes and quite fast, but still not up to par with the power of polini.

Ok, I was a bit baked and I may have come off harder on the Polini than I should have. I understand a lot of people have them and that alone will make it seem like there's more problems with them than there is. They look like a sweet kit, and I'm sure they are tunable, and I have heard the 64 can be tuned to rival many 80 kits.

I guess what I'm saying is that I'm not feeling like a kit that sensitive is for me yet, even if I sacrifice some potential speed getting a different one. Who knows, I may find, when I finally am ready to get a kit, that though sensitive, it _actually is_ the one I want, due to it's output capabilities.

It sounds like one should care for a Polini like a racing professional would, and get one only when they are ready to provide a professional level of care.

I kinda want a mk 65 I think, they sound harder to noob-destruct :-)

There is a parma for the Puch...

Yup, I am aware Puch is gone, I was just dreaming of Austrian engineering and metallurgy in a big shiny (probably kind of heavy) indestructible kit.

the bike should slow down when you let go of the throttle. if it doesn't then you are running too lean.

i'm assuming you replaced the piston each time. did the acid eat away anything critical. dd it work well, you have seized 4 times some i'm kind of curious