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12ps Barrel

Posted: Sat May 23, 2020 3:46 pm
by Hotdog
Hi, looking at these PX200 barrels advertised as 12ps (mostly from German shops), are they really 2.5-3hp over a standard barrel ! Has anyone used one and had it dynoed ?

Re: 12ps Barrel

Posted: Sat May 23, 2020 6:59 pm
by gaz_powell
All the 12ps ones I've seen are genuine piaggio or BGM, theyve got thick rings, I think the difference is over the Indian shite that you see for 60 quid with badly cast ports etc.

Foir me they are just decent barrels/pistons in the sea of crap now available.

Be interesting to put one on a stock bike and see what you get

Take one and tweek it !!

Re: 12ps Barrel

Posted: Sat May 23, 2020 8:31 pm
by Shaunbond
Maybe a good base for a HB Stage 4 tune.

Re: 12ps Barrel

Posted: Sun May 24, 2020 8:30 am
by brynt
There is an artical in an old issue of Scootering that use a BGM cylinder as a starting point for a Pro Porting tune.

https://s265.photobucket.com/user/1gadg ... 1.jpg.html

Re: 12ps Barrel

Posted: Sun May 24, 2020 11:56 am
by coaster
gaz_powell wrote: Sat May 23, 2020 6:59 pm.......I think the difference is over the Indian shite that you see for 60 quid with badly cast ports etc
Possibly a sweeping statement Gaz, I bought a pattern LML 150 5 port reedvalve cylinder a few years ago from an Indian dealer, it cost £24.99 for the barrel and piston (no head) and £24.99 shipping. It arrived in under a week and the quality was amazing, ports all nicely finished and far better than either of the GT barrels I hgave had. Slight concerns about the quality of the unknoiwn brand piston have so far proved unfounded although not many miles logged up yet. Some of the other stuff I had to buy for it was shite though :(

Re: 12ps Barrel

Posted: Sun May 24, 2020 12:46 pm
by gaz_powell
coaster wrote: Sun May 24, 2020 11:56 am
gaz_powell wrote: Sat May 23, 2020 6:59 pm.......I think the difference is over the Indian shite that you see for 60 quid with badly cast ports etc
Possibly a sweeping statement Gaz, I bought a pattern LML 150 5 port reedvalve cylinder a few years ago from an Indian dealer, it cost £24.99 for the barrel and piston (no head) and £24.99 shipping. It arrived in under a week and the quality was amazing, ports all nicely finished and far better than either of the GT barrels I hgave had. Slight concerns about the quality of the unknoiwn brand piston have so far proved unfounded although not many miles logged up yet. Some of the other stuff I had to buy for it was shite though :(
Was only referring to the Indian/far easy produced P2 kits I have had through my hands, to get them working properly they needed loads of works on the ports, the alloy ones that appeared had the liners off true, the bore clearance was terrible, piston ports were undersized.
The barrels compared to Piaggio (and probably BGM) are worlds apart.

Ive bought plenty LML stuff and found it to be generally half decent, just doing a reed conversion on some P2 casing using the LML reedblock and a home made convertor/spacer - to utilise an SI carb