polini vs malossi

scooterwerx · Post by **scooterwerx** » Wed Oct 15, 2008 1:09 pm

anyone have any experience with the polini cylinder that daywot is selling on ebay for the se50/nb50? im thinking about replacing my malossi cylinder because it has some scoring in the bore, and i was wondering how the two stack up...

Kenny_McCormic · Post by **Kenny_McCormic** » Wed Oct 15, 2008 4:38 pm

Run it till it quits, run more oil, make sure your not running hot.

Dac · Post by **Dac** » Wed Oct 15, 2008 5:03 pm

polini...
malossi...
There both the same thing. polini vs malossi is a debait that has been going on since the company's started. There dead even on performance, its really just a preference thing.

scooterwerx · Post by **scooterwerx** » Thu Oct 16, 2008 3:56 am

yea i know, i was running snythetic oil at 50:1, now i know better. i read the jennings articles and now will run as much as it will fire through...so i should get the oversize piston and just keep my malossi cylinder? its way down on power, especially when it gets hot...

maddog · Post by **maddog** » Fri Oct 17, 2008 1:34 am

those engines run hot cuz gear ratios are not offered, been there done that!

MediumKahuna · Post by **MediumKahuna** » Fri Oct 17, 2008 10:19 am

I got a big bore kit(65cc) for my NB50 from VT that is made in Taiwan.
Its different than some of the other kits in that its the same height as the original cylinder while the rest are taller than original.
Also the cylinder is iron (like original).
Not sure about the performance 'cause not done with build yet.

Arnadanoob · Post by **Arnadanoob** » Fri Oct 17, 2008 7:48 pm

Is your bike still running? Believe it or not most bikes tend to run better after the first seize, I wouldn't go changing it unless you really notice that something's wrong. You could simply switch to a higher premix ratio (more oil) and upjet.

If you're set on buying a bore kit, I'd say that you can't go wrong with either since there's a lot of Taiwan-made crap that won't even stack up to either Polini or Malossi.

scooterwerx · Post by **scooterwerx** » Sat Oct 18, 2008 2:27 am

it does still run, but i mic'ed the bore and cylinder and the clearance is a little on the loose side, .003, and im sure the rings have had it. they've seen a few miles, not to mention the top of pikes peak! i got a 21mm carb and i just need to make a housing for a larger filter and ill see how it runs...thanks

also...i got gears from malossi and they went right in, no mods necessary...

and...the cylinder height is taller than the stock cylinder, but the distance from the wristpin to the piston crown is larger too. the squish is at .95 mm without a gasket, it was at 1.35mm with the gasket, so i just lapped the cylinder to the case and permatexed it...i am in the process of doing all the timing calculations but so far its dead on.