Cylinder vs crankcase (reed) induction
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Jet Eye Master
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 2132
Location: London UK
Mon Jun 29, 2020 3:41 am quote
There used to be 0.3 head gaskets but they seem to have disappeared from supply.

1.15 squish is not so big. Not ideal but ok.

Option 2 might be worth a go as it's easy. 129 is quite a bit but could work. Now the exhaust is changed would make an interesting test. Will go better at WOT but pulling 4th is the concern. Was it ok on the bad exhaust?
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1443
Location: UK (South East)
Mon Jun 29, 2020 6:38 am quote
I never really got to wind it out in 4th with the old exhaust, as I was getting constant splutter, but it could definitely pull 4th at 129 TD. The spluttery condition was clogged exhaust, not the main jet being too big, so now that's sorted, the higher TD is worth a shot.

Gearbox reminder:
PX125 but with 22T clutch
120/70-11 rear tyre

Calculator below assumes that it can make 9000 RPM in all 4 gears. Possibly not the case in 4th. To be determined if I can find the right road and some spare undies

gearing.jpg

Jet Eye Master
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 2132
Location: London UK
Mon Jun 29, 2020 7:25 am quote
Sounds like a plan, back to 129. No reason not to now. Now the piston is done as well, so will need a slight upjet at WOT.
I think your gearing works out similar to a 200. On mine I have seen 8700rpm in 4th, so far. Still more in it. No reason yours won't do similar with an expansion pipe.
Although I expect yours will make 8000rpm in 4th even with the box. Well into the scary zone.
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1443
Location: UK (South East)
Tue Jun 30, 2020 12:14 pm quote
Jack, did you take anything off the piston skirt to account for the 60 stroke, or is that something that people only needed to do on the older 210 kits/pistons?
Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 7646
Location: Victoria, Australia
Tue Jun 30, 2020 6:33 pm quote
swa45 wrote:
Jack, did you take anything off the piston skirt to account for the 60 stroke, or is that something that people only needed to do on the older 210 kits/pistons?
Pretty sure the initial 2016 release pistons needed it, but the newer ones (with the black coating) don't.
Jet Eye Master
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 2132
Location: London UK
Tue Jun 30, 2020 9:06 pm quote
Ginch wrote:
swa45 wrote:
Jack, did you take anything off the piston skirt to account for the 60 stroke, or is that something that people only needed to do on the older 210 kits/pistons?
Pretty sure the initial 2016 release pistons needed it, but the newer ones (with the black coating) don't.
New pistons are shorter. And it was running already
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1443
Location: UK (South East)
Tue Jun 30, 2020 10:13 pm quote
Cheers chaps. Yes, it has been running without any contact. Was just thinking of anything else I needed to do while I was in there.
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