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Tank Art
Last Post: joe s
Posted On: 3 Hours Ago
Replies: 43
Views: 2,560
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Members Birthdays
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19th November 2022
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Senior Master Custom Bike Builder
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Join Date: Dec 2007
Location: Australia
Posts: 9,386 Sportster/Buell Model: XLCH 1000 Sportster/Buell Year: 1977 Sportster/Buell Model #2: 75 motor in Norton frame. Other Motorcycle Model: 42WLA 45, Harton, Narley Other Motorcycle Year: 1942
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Quote:
Originally Posted by XLXLXL
hmmm how do we measure this for sure? what is the specification we are talking about?
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It's in the factory service manual. Somewhere about 2 to 4 thou clearance. Measured with a ball gauge and micrometer usually, or by rocking the stem in the guide and measuring movement with a dial indicator.
Carefull inspection of the valve stems should show any evidence they have been hanging up. Will be all scuffed up or galled. |
20th November 2022
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XL FORUM TEAM MEMBER
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Join Date: Jan 2020
Location: Loxahatchee, FL (S. FL)
Posts: 2,110 Sportster/Buell Model: XLCH Sportster/Buell Year: 2003 Sportster/Buell Model #2: XL Sportster/Buell Year #2: 1981 Other Motorcycle Model: FXDC Other Motorcycle Year: 2013
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I would use a gage pin. Tells you the largest diameter that will pass through the guide, concentricity etc.
The other methods are valid also
__________________
Steve
'81 Andrews "Y" cams, K. Black 9-1 pistons
'03 1250 NRHS stage two Lightning heads, SE536 cams, mik flat slide 42
'01 Cyclone stock
'13 FXDC 96" stock
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30th November 2022
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Biker
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Join Date: Jan 2019
Posts: 43 Sportster/Buell Model: XLCH 1000 Sportster/Buell Year: 1973
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I found the problem. we didn't think about it before, and I thought it would never happen, but it did. Sh*t happens!
The cam gear #2 woodruff key was broken, and the gear rotated in different directions. I have re-open the cam gear cover hundreds of times (hyperbolic) and finally realized this is what happened.
here is the pic
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