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  #1  
Old 10th October 2017, 03:44 PM
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triumph triumph is offline
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Default 2-Stroke ring gaps

Picked up my Yamaha yl1 barrels from their rebore today and not happy with the ring gap and ports on them.

Most two strokes I've built have .010" - .015" ring gap clearance, I haven't been able to find a manual for my bike yet but safe to say the .003" clearance they were handed back to me with will seize the engine if run.

Its a 39mm air cooled bore, what should I open the gap up to?

Cheers guys
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File Type: jpg yl1 bore 2.JPG (65.1 KB)

Last edited by triumph; 10th October 2017 at 04:18 PM.
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  #2  
Old 10th October 2017, 04:26 PM
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My Motorcycle Pics Motorbike: jap brit and euro
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Default Re: 2-Stroke ring gaps

id go .004 and run it in gently.
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  #3  
Old 10th October 2017, 07:13 PM
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Default Re: 2-Stroke ring gaps

Originally Posted by chopper
id go .004 and run it in gently.
I'd second that.
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  #4  
Old 10th October 2017, 07:25 PM
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Biker.ie Member No. 8707 from Kill. Co.Kildare
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Default Re: 2-Stroke ring gaps

measure at bottom of cylinder.

ring gap should be between .006 and .013 inches i.e 0.15 + 0.35 mm


- google yamaha YL-1 Twin jet vaerksteds manual

it is in English and has everything you need.

Last edited by ENGLISH; 10th October 2017 at 07:41 PM.
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  #5  
Old 11th October 2017, 12:16 AM
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triumph triumph is offline
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Default Re: 2-Stroke ring gaps

Originally Posted by ENGLISH
measure at bottom of cylinder.

ring gap should be between .006 and .013 inches i.e 0.15 + 0.35 mm


- google yamaha YL-1 Twin jet vaerksteds manual

it is in English and has everything you need.
thats brilliant, thanks. Had tried to find a pdf manual with no joy so now have it, theyre crazy money to buy. Thanks
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  #6  
Old 11th October 2017, 01:14 PM
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Motorbike: Constantly changing
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Default Re: 2-Stroke ring gaps

Originally Posted by triumph
thats brilliant, thanks. Had tried to find a pdf manual with no joy so now have it, theyre crazy money to buy. Thanks
No problem. I have a fondness for the 'Twin'' . is it 6v or 12 v ?
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  #7  
Old 11th October 2017, 01:57 PM
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Default Re: 2-Stroke ring gaps

6v system, have yet to see if the headlight is a candle or not
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