Vespa pinking
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jono
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- Joined: Mon Apr 23, 2012 12:09 pm
- Main scooter: 1977 P200 Mk1 non indicator
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Hi help please, I have a newly re built P2 (1000 miles or so) all standard except JL and jetted to suit. Rode to southend at the weekend, heat siezed on the way there all ok after 5 mins, and above 50mph (1/2 to 2/3 throttle)it would pink badly so had to ride 100 odd miles at 45!! Thought it was a jetting problem as plug very lean, stopped at Kegra's (expensive) and up jetted it to a 122 then a 123 I think it has helped but not much. Any ideas please. cheers jono
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bazman
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What type of jl pipe ?
I built a engine for mate of mine , with JL R/H thing heat siezed all the time , everything checked out ok but exhaust caused the problems!
I built a engine for mate of mine , with JL R/H thing heat siezed all the time , everything checked out ok but exhaust caused the problems!
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bazman
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Funnily enough that happened as well !!jono wrote:Yes right hand JL the reedspeed supplied version. barrell has got so hot it has melted the cowl !!
Although i ran one on my 210 malossi no problem, that's why i recomended it to him.
Have you another exhaust to try just to rule that out?
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gaz_powell
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i had the same when i built a p2 with a rebored barrel at 66.9mm with a rh jl put a 125 in it and was nipping , honed the barrel to 4 thou clearance ended up on 128 with the timing retarded to 17 deg but mate sold it shortly after so not sure what happened
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drunkmunkey6969
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23 is toooo much, move it back.jono wrote:Sausage built it for me as a standard rally hack engine so 23 degrees I am guessing.
Also seen a few problems with JL right handers.....got to confess I used the old 'rz' version with great success, but not sure now about the differences between the newer versions/copies. Some stiffle at top revs, almost like fuel starvation, some run hot....mixed results!
See our YouTube scooter channel for Tech-help: https://www.youtube.com/c/TheScooterFactory/videos
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gaz_powell
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had the same with a revolver !