Weekend of fun and then pop! Holed piston
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Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3886
Location: Oceanside, CA
Sun Feb 21, 2021 3:20 pm quote
Just got back from a Thursday to Sunday camping trip in the desert with my friends. One of which is the owner of a 63 VBB that I recently added a Vape kit to. Spent all weekend riding around Borrego Springs/ Salton Sea area. This morning, we went out on a breakfast ride and hit some gnarly headwinds. Im not sure if its the headwinds that did it, or some shit gas, but I holed the piston on my trusty 74 Rally.

Motor is a stock cylinder, Pinasco Flytech ignition and a Sip Road 2.0. Jetting is in the mid 120's IIRC. Its been two years since I touched that motor and its been dead reliable. I was full throttle high revs, high load but low speed. Anyone ever heard of that combination causing a holing scenario? Or do you think its shit gas from the desert gas stations?

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Beautiful 70* days everyday. Little chilly in the evenings

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Indiana. My sisters dog

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63 VBB. 2 port 177 kit, 24/24, Vape, Sip Road 2.0 and the rest is stock 8"

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Settled on a 160, be3, 135. Wide open for two miles and temps never got above 360*

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Nowheresville

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Waiting for the Mrs. to come grab me

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My two

Jet Eye Master
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 2602
Location: London UK
Sun Feb 21, 2021 3:32 pm quote
At least you were on the way home!

This is exactly what happens when the timing is way too strong. If variable timing, it's at least 4 degrees over at the rpm where it holed the piston.

GS 66.5mm piston. Adjust timing, full rejet. If splitting the engine to clean it out, add a 60mm crank to that list. Will go cross country touring with that lot and WOT all the way.
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3886
Location: Oceanside, CA
Sun Feb 21, 2021 3:40 pm quote
Jack- yes itís variable timing. Do you mean itís 4* too advanced for that rpm or 4* retarded. I think Pinasco idles around 24/25 and then retards to 17??? Itís been a while.
Hooked
1952 Allstate 1955 Allstate 1958 lambretta 1965 Allstate 1968 sprint
Joined: 20 Jul 2017
Posts: 478
Location: Central california
Sun Feb 21, 2021 4:02 pm quote
Holed piston
Hey MJ....that scooter has been running strong like you said for two years, it would have ran for 5 years, but when was the last time you ran the scooter like you said. That scooter was not used to that kind of punishment especially with the timing being to advanced. If there is a time that the timing needs to be right
on you found it. I canít think of anything else that would cause that situation other than timing and the engine running lean, or both.

Have not heard from you in a while. Hopefully we can catch up in slo (rom)
Hope all is well scott
Jet Eye Master
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 2602
Location: London UK
Sun Feb 21, 2021 4:09 pm quote
MJRally wrote:
Jack- yes itís variable timing. Do you mean itís 4* too advanced for that rpm or 4* retarded. I think Pinasco idles around 24/25 and then retards to 17??? Itís been a while.
Too far advanced. Setting up by the book is where all the trouble starts. Where ever your stator is set move it 4 (approx) mm clockwise.
Going to split it to clean, or hope for the best?
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3886
Location: Oceanside, CA
Sun Feb 21, 2021 4:18 pm quote
Jack221 wrote:
MJRally wrote:
Jack- yes itís variable timing. Do you mean itís 4* too advanced for that rpm or 4* retarded. I think Pinasco idles around 24/25 and then retards to 17??? Itís been a while.
Too far advanced. Setting up by the book is where all the trouble starts. Where ever your stator is set move it 4 (approx) mm clockwise.
Going to split it to clean, or hope for the best?
Aye advanced. Iíll do it right and split it. Pics soon
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3886
Location: Oceanside, CA
Sun Feb 21, 2021 4:21 pm quote
Re: Holed piston
Sjanuary wrote:
Hey MJ....that scooter has been running strong like you said for two years, it would have ran for 5 years, but when was the last time you ran the scooter like you said. That scooter was not used to that kind of punishment especially with the timing being to advanced. If there is a time that the timing needs to be right
on you found it. I canít think of anything else that would cause that situation other than timing and the engine running lean, or both.

Have not heard from you in a while. Hopefully we can catch up in slo (rom)
Hope all is well scott
Havenít forgotten you Scott. Just havent been in your neck of the woods lately. Last time I flogged this one that hard was probably a year ago. Rest of it has been stuff around town/ down to San Diego. Iíll pull the head soon and get back with pics.
Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3886
Location: Oceanside, CA
Sun Feb 21, 2021 5:24 pm quote
Cleaner than I would have wanted it to be. 160, BE3, 128 SIP (125 equivalent

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Ossessionato
1980 P200E , 2005 Stella 177
Joined: 20 Jul 2018
Posts: 2660
Location: Staten Island, NY
Mon Feb 22, 2021 2:12 pm quote
damn! but that is a beautiful scoot nonetheless! Also looks like some great rides out there.
Molto Verboso
79 P200E, 62 Allstate, 2008 Stella
Joined: 11 Jan 2006
Posts: 1989
Location: Florence, OR
Mon Feb 22, 2021 2:36 pm quote
NOOOOOOOO! That's bites. But hey, at least you're in the 60/8 club
Jet Eye Master
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 2602
Location: London UK
Mon Feb 22, 2021 3:52 pm quote
MJRally wrote:
Cleaner than I would have wanted it to be. 160, BE3, 128 SIP (125 equivalent
Jetting over stock so, hole like that can only be timing.

Going to change the crank? It should be ok, aluminum should clean itself out of the big end bearing but if you change crank, a 60mm is really good in a stock cylinder. GS piston is better in every way over the meteor. If you're going to do the work it might as well be 10mph faster.
Molto Verboso
79 P200E, 62 Allstate, 2008 Stella
Joined: 11 Jan 2006
Posts: 1989
Location: Florence, OR
Mon Feb 22, 2021 5:47 pm quote
[quote="Jack221"]
MJRally wrote:
Going to change the crank? It should be ok, aluminum should clean itself out of the big end bearing but if you change crank, a 60mm is really good in a stock cylinder. GS piston is better in every way over the meteor. If you're going to do the work it might as well be 10mph faster.
I'm going to remember and do this when I open up my P200
Ossessionato
Joined: 26 Oct 2015
Posts: 2923

Thu Feb 25, 2021 8:14 am quote
Didn't SIP post something up a year or so ago that they didn't recommend installing their variable Vape kit on a stock cylinder? Whether it was user install with the kit or if the kit doesn't play well with a stock cylinder, one thing is for sure, there has been a fair amount of scooters with stock cylinders with variable Vape and holed pistons. So there is a correlation there for sure.
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