Biker.ie Forums Irish Motorbike Enthusiasts
Home Events Bikes for Sale Mobile Style Motorbike Chat Racing Rideouts » Register free!

Go Back   Biker.ie Forums > General > The Workshop

Reply
 
  #1  
Old 10th October 2017, 02:44 PM
triumph's Avatar
triumph triumph is online now
MotoGP Legend
 
Biker.ie Member No. 5461 from Dublin
1,054 posts since May 2007
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
Attached Images
File Type: jpg yl1 bore 2.JPG (65.1 KB)

Last edited by triumph; 10th October 2017 at 03:18 PM.
Reply With Quote
  #2  
Old 10th October 2017, 03:26 PM
chopper's Avatar
chopper chopper is offline
spanner spinner
 
Biker.ie Member No. 1841 from meath
53,321 posts since May 2005
My Motorcycle Pics Motorbike: jap brit and euro
Modifications: mud
Default Re: 2-Stroke ring gaps

id go .004 and run it in gently.
Reply With Quote
  #3  
Old 10th October 2017, 06:13 PM
bushman's Avatar
bushman bushman is offline
two strokes are enough
 
Biker.ie Member No. 7837
2,252 posts since Jan 2008
Default Re: 2-Stroke ring gaps

Originally Posted by chopper View Post
id go .004 and run it in gently.
I'd second that.
Reply With Quote
  #4  
Old 10th October 2017, 06:25 PM
ENGLISH's Avatar
ENGLISH ENGLISH is online now
WSB Contender
 
Biker.ie Member No. 8707 from Kill. Co.Kildare
629 posts since Mar 2008
Motorbike: Constantly changing
Modifications: Always standard
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 06:41 PM.
Reply With Quote
  #5  
Old 10th October 2017, 11:16 PM
triumph's Avatar
triumph triumph is online now
MotoGP Legend
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 5461 from Dublin
1,054 posts since May 2007
Default Re: 2-Stroke ring gaps

Originally Posted by ENGLISH View Post
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
Reply With Quote
  #6  
Old 11th October 2017, 12:14 PM
ENGLISH's Avatar
ENGLISH ENGLISH is online now
WSB Contender
 
Biker.ie Member No. 8707 from Kill. Co.Kildare
629 posts since Mar 2008
Motorbike: Constantly changing
Modifications: Always standard
Default Re: 2-Stroke ring gaps

Originally Posted by triumph View Post
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 ?
Reply With Quote
  #7  
Old 11th October 2017, 12:57 PM
triumph's Avatar
triumph triumph is online now
MotoGP Legend
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 5461 from Dublin
1,054 posts since May 2007
Default Re: 2-Stroke ring gaps

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

  Return to Main Topic Biker.ie Forums > General > The Workshop

Tags
2stroke, gaps, ring


Similar Threads
Thread Thread Starter Forum Replies Last Post
O ring Vs. Non O ring Gixxer21 General Bike Chat 6 22nd February 2015 02:39 PM
Manx GP Festival renamed to ''Isle of Man Festival of Motorcycling' Admin Racing and Trackdays 7 23rd October 2012 10:00 PM
wanted 250 2 stroke kx cr yz rm kdx 125 Buying and Selling 0 1st June 2008 12:07 PM
Special ring SUGS Jokes, Pics & Flics 5 26th July 2007 10:01 AM
Whats the best ever Johnny Cash song ? Brendan Off Topic 20 3rd December 2006 10:05 PM


Support Biker.ie


Forum RSS news feed Main Biker.ie RSS news feed