Re: Derbi Variant PHBG 17,5 AD #2585

Mike Mayer /
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Hi guys,

after two days of trying anything nothing went better. All jets, idle and main I have tried, the engine still was impossible to jet properly.

Still bogging and missfireing.

Today morning, it was cold outside by 18° y decide to try a new NGK B8HS plug after I suspected it could probably be an ignition issue.

Wow!! Now it works...! But this would mean trying to jet the engine I have “killed” 2 news NGK B8HS and this was the cause engine was missfired and imposs to jet.

Ok, the third, new, NGK B8HS out and a new B9HS in. No missfireing!

Still good with 80 main jet! Needle W7 (2 notch) and 42 idle jet.

So I think the problem was all the time 2 plugs I had ruined by not being the proper ones.....

Now I can start to carburate properly ..... I hope so!

Thanks for all and still interested in any advices for the Gilardoni 65cc (edited)

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