Page 13 of 17
Project Poor Man’s Pro Race: Installation in the Morning
Posted: Sun May 05, 2019 10:39 pm
by toratora
Project Poor Man’s Pro Race: Freno Disc
Posted: Mon May 06, 2019 7:39 am
by toratora
Looks like it spent Derbi de Mayo hanging out in Memphis. Might even show up today considering that it has already made it to South San Francisco. I do wonder about the time stamps though as those do not appear to be the local zone.
Project Poor Man’s Pro Race: Freno Disc III
Posted: Tue May 07, 2019 3:39 pm
by toratora
Project Poor Man’s Pro Race: Cannot Rev Out to Wont Run at All
Posted: Tue May 07, 2019 6:39 pm
by toratora
Re: PPMPR: Project Poor Man’s Pro Race
Posted: Wed May 08, 2019 6:24 am
by jkv357
Anything unusual with the airbox, intake snorkel, or carb in general? Any way something could have blocked the intake?
Seems like a air or fueling (carb) issue to me.
Project Poor Man’s Pro Race: Burning Bright
Posted: Thu May 09, 2019 12:39 am
by toratora
When the cylinder failed Greg came out to rescue me.
Last night I did some reading on checking the compression so I went out to check it again today. Now it will only go a bit over 75psi—very much like what happened with the Silver bike. I really becoming convinced these cylinders fail very quickly.
To answer to J’s question. When this first happened I disconnected the air box to ensure it wasn’t the issue.
PPMPR: Project Poor Man’s Pro Race
Posted: Thu May 09, 2019 4:14 am
by kaldis12
Maybe a broken ring could cause this. Will you pull down the cylinder? Its just a 5min job
Re: Project Poor Man’s Pro Race: Burning Bright
Posted: Thu May 09, 2019 6:27 am
by jkv357
toratora wrote: ↑Thu May 09, 2019 12:39 am
Last night I did some reading on checking the compression so I went out to check it again today. Now it will only go a bit over 75psi—very much like what happened with the Silver bike.
I really becoming convinced these cylinders fail very quickly.
To answer to J’s question. When this first happened I disconnected the air box to ensure it wasn’t the issue.
Bummer.
What cylinders are those again?
Project Poor Man’s Pro Race: Burning Bright
Posted: Fri May 10, 2019 12:39 am
by toratora
kaldis12 wrote: ↑Thu May 09, 2019 4:14 am
Maybe a broken ring could cause this. Will you pull down the cylinder? Its just a 5min job
It would be way more than five minutes—it takes longer than that just to remove the plastics. Both engines are going to be opened up eventually. I’ll probably pull the engine out of the Silver bike, and put a stock engine in it for now.
jkv357 wrote: ↑Thu May 09, 2019 6:27 am
Bummer.
What cylinders are those again?
Yeah it sucks. Especially since both kits are suffering the same symptoms. I checked in with some folks that have these kits, and they stated that the most they get before needing to do the rings is 1000km, which is about 600 miles. That’s racing engine level servicing, but even then they would still run. These kits wont even run. It could be possible that the just came with bad rings
These are the Stage6 Big Racing 77cc kits with the new style heads. I’ve ordered a Metrakit ProRace 3 70cc kit to install on this bike—it was the only decent kit I could get in time for the 19/19 ride. It wont have as much power, but it will be way more reliable than the Stage6 kits have proven to be with my bikes. I am really surprised that these kits would wear out so quickly.
Re: PPMPR: Project Poor Man’s Pro Race
Posted: Fri May 10, 2019 10:32 am
by kaldis12
Oh yeah sorry. I forgot that you have to remove the plastics and remove the engine. I can just remove the cylinder in 5mins, with almost no fairings
It sound me a ring issue, my buddies had about the same simptoms as your bike. Never give up, I would be really interested in how does the 77 and 88 compare to each other on a video. You will have to do one decent video for us
keep it up