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Stumped By My Sherpa.


netley
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All has been going well apart from paint from the tank clogging the carb.

I changed all the fluids and put an inline filter in but now it won't start. Plug was oily so I assumed flooding and kicked it over for a while put new plug in and it started second kick. It wouldn't rev and was stuttering a little regardless of choke position. Suddenly it stopped. Kicked it over again and it fired briefly and stopped again. Gave it a few more kicks to no avail and pulled the plug. Really oily again.

Any ideas?

Cheers.

Neil

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Yes Larry, new points and condenser, re-timed and gapped. It ran beautifully apart from the fuel tank problem. I had to clean the carb out 3 times while on the trial and once done it started 1st or 2nd kick.

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Had similar effects with Standard plugs NGK BP 5ES on Bultaco and SWM, it was bad, they even spoild the plugs total until no spark occured, which too happend in these moments you never wan't it would happen.

 

Try a hotter plug, my bikes are running much better on a BP 4ES!

 

 

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Wow that's a platnium plug!

I personal doubt it's so much better as in electric conduction copper is only outperformed by silver even gold is less good!

Physics measured in: σ in S/m

Silver 61 · 10^6

Copper 58 · 10^6

Gold 45 · 10^6

Aluminium 37 · 10^6

Wolfram 19 · 10^6

Probably the tip of the standard copper plug is a little bit a backdraw but the connection between the cooper core and the tip is made so that as much as possible electrons can be transferred...

Platnium 10,2· 10^6

(nearly forgot but not very good as seen here!)

Edited by pschrauber
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Wow that's a platnium plug!

I personal doubt it's so much better as in electric conduction copper is only outperformed by silver even gold is less good!

Physics measured in: σ in S/m

Silver 61 · 10^6

Copper 58 · 10^6

Gold 45 · 10^6

Aluminium 37 · 10^6

Wolfram 19 · 10^6

Probably the tip of the standard copper plug is a little bit a backdraw but the connection between the cooper core and the tip is made so that as much as possible electrons can be transferred...

Platnium 10,2· 10^6

(nearly forgot but not very good as seen here!)

Thanks pschrauber, I appreciate that the BP5EV has a Gold Palladium central electrode.

My own experience has shown me that the EV plug will out perform and out last any other plug I've tried down through the years.

For one season many years ago, I did use the EG plug in motocross, however I found the longevity to be much shorter than than the EV and EGV.

I first used the EV plug back in 1982 in my 199 Sherpa T and it transformed the bike immediately and since then I have used them as my default spark plug in every trials, enduro and motocross bike I've owned since then. I did use their EGV plug a few times but never found any appreciable difference apart from been much more expensive.

Edited by model80
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