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Bit Stumped?

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Bit Stumped?

Postby foremanbob » Mon Jun 03, 2019 9:20 pm

Just built a new engine for a mate RT195... built about 4 of these this year... can I get the bastard to start?

Engine leak tested. 1.2mm squish. 0.5mm plug gap

Got plenty Fuel... Know I've got good compression... I'm getting a good strong spark....

I dont know the heritage of the Stator & Flywheel, never saw the engine running but told it was....

Compression, Fuel & Spark.... should equal bang... but nothing.

Tried easystart... nothing...

Can only be timing right?

Static Timing set at 17deg (positive stop TDC)
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Re: Bit Stumped?

Postby Jono » Mon Jun 03, 2019 9:35 pm

Hi mate
Is the engine in the scooter or on test rig.
If in bike is ignition down to Earth? Disconnect ignition kill wire to headset.
Maybe worth a try.
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Re: Bit Stumped?

Postby MickYork » Mon Jun 03, 2019 9:50 pm

Piston right way round ?
Would be trying another stator, plug, cdi and if desperate a flywheel.....
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Re: Bit Stumped?

Postby foremanbob » Mon Jun 03, 2019 10:02 pm

Not green wire from headset... good a good strong spark

Piston fitted correctly

Got a new stator and flywheel for the next build that I’ll try tomorrow night
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Re: Bit Stumped?

Postby HxPaul » Tue Jun 04, 2019 8:51 am

foremanbob wrote:Just built a new engine for a mate RT195... built about 4 of these this year... can I get the bastard to start?

Engine leak tested. 1.2mm squish. 0.5mm plug gap

Got plenty Fuel... Know I've got good compression... I'm getting a good strong spark....

I dont know the heritage of the Stator & Flywheel, never saw the engine running but told it was....

Compression, Fuel & Spark.... should equal bang... but nothing.

Tried easystart... nothing...

Can only be timing right?

Static Timing set at 17deg (positive stop TDC)


If your getting a good spark,all it can be is the timing.
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Re: Bit Stumped?

Postby Toddy » Tue Jun 04, 2019 12:13 pm

foremanbob wrote:Not green wire from headset... good a good strong spark

Piston fitted correctly

Got a new stator and flywheel for the next build that I’ll try tomorrow night


A good strong spark with the plug out does not mean its sparking in the scooter try the green wire out to check
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Re: Bit Stumped?

Postby foremanbob » Tue Jun 04, 2019 12:45 pm

Thanks Toddy... only green from stator connected...
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Re: Bit Stumped?

Postby coaster » Tue Jun 04, 2019 3:33 pm

Is the plug getting wet?
It might be sparking but is it sparking at the right point? Have you tried a different flywheel?
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Re: Bit Stumped?

Postby foremanbob » Tue Jun 04, 2019 7:48 pm

Changed to a new flywheel... no difference...

Changed over the stator... started second kick....

Thanks for your help...
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Re: Bit Stumped?

Postby Toddy » Tue Jun 04, 2019 8:15 pm

foremanbob wrote:Changed to a new flywheel... no difference...

Changed over the stator... started second kick....

Thanks for your help...


Always good to hear a happy ending mate
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Re: Bit Stumped?

Postby foremanbob » Tue Jun 04, 2019 8:25 pm

Yeah... you do start to doubt yourself.... everyday a school day with old 2 strokes
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Re: Bit Stumped?

Postby Andyf » Wed Jun 05, 2019 9:20 pm

I'm a fully paid-up member of the WKFA Scooter Club so forgive daft question. What wasn't happening?
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