loose guides in J Head

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07 May 2012 14:39 #520501 by LarryC
loose guides in J Head was created by LarryC
Here's an example of loose fitting J Model Valve Guides.

This is out of an E.L.R. Head. You can see how black the guide is where the oil was getting by between the guide and the guide bore. This is not uncommon in J model heads and in fact, about the 4th ELR head in particular I've run into this situation.

The bike only has 12000 miles on it but oil consumption was high. The seals were all shot from age and #3 exhaust guide was dropping into the bore.


Attachment JGuide.jpg not found

Larry C.
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  • wireman
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07 May 2012 16:35 #520519 by wireman
Replied by wireman on topic loose guides in J Head
Could you ream the holes and use oversized guides to fix it? B)
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  • mark1122
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07 May 2012 18:42 #520534 by mark1122
Replied by mark1122 on topic loose guides in J Head
i hadnt heard of that before. good to know. what r the options for a remedy?
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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07 May 2012 18:58 #520541 by Kraz1
Replied by Kraz1 on topic loose guides in J Head
"One Option" Click----> Valve Guides
[size=9pt]CLICK---> WWW.CYCLEMADNESS.COM [/size]

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08 May 2012 07:08 - 08 May 2012 07:09 #520654 by zed1015
Replied by zed1015 on topic loose guides in J Head
APE do o's guides too.
Also a common issue when the guides have been changed a few times.
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Last edit: 08 May 2012 07:09 by zed1015.

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08 May 2012 07:43 #520660 by LarryC
Replied by LarryC on topic loose guides in J Head

wireman wrote: Could you ream the holes and use oversized guides to fix it? B)


I keep some +.004's around for this situation. Last one was so bad it needed 2 +.025".
Larry C.

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