Engine won't start when hot

[LSLTopic starterBerichten: 15]

Help…
My setup:
Malossi 43mm w. Malossi head
13/13 Dellorto w. Polini filter
Main jet 68
Proma Circuit exhaust
Malossi Vario
Pull start
Complete new original contact point ignition(new condensator, inner coil, outer coil wires, contact point…)
2% two stroke oil.

– starts og and rund very well.

…but will not start at all when engine/sparkplug is hot.

Normally I run with NGK B8HS. When the engine is cold it starts right away and runs perfectly. But if I stop the engine and try to start again, it won’t start at all, not untill the engine has cooled down.

Changing the spark plug or waiting until the old one has cooled down, will make it start again – as easy as before.

Changing to a B7HS doesn’t change a thing, the problem remains.

Furthermore the spark plugs only last approximately 100 -200 km…

It seems like the problem started when changing from a no name 43mm cylinder to the Malossi 43 mm cylinder.

Any suggestions???

[niek1992BijdragerBerichten: 1882]

Although it’s colour is “koffiebruin” there are some white spots on the central electrode indicating too hot sparkplug.. Did you change the jet to a larger one? And have you checked if the head was absolutely 100% flat? is there a headgasket in between or not? What’s the current squish? a sparkplug should last longer than 100km.

A B7HS is a hotter sparkplug, since you can’t start your engine when it’s hot maybe try a colder one. But only do this if you’ve checked the things i’ve mentioned earlier.

 

[Gebruiker]

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