The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Red_Hen on April 07, 2011, 11:06:03 AM

Title: Is this the right head for my R65LS?
Post by: Red_Hen on April 07, 2011, 11:06:03 AM

Hi Gang,

I discussed this with Rob before purchasing but before I run the new head to the machine shop to get cleaned up, can I please get another confirmation that this is the correct head for my R65LS?  I believe some of the older ones had smaller valves?

The numbers say R65 BMW 335-234   R6 Si Cu

Here's pictures from the posting on Ebay:

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=270715119582&viewitem=&sspagename=STRK%3AMEWNX%3AIT

Title: Re: Is this the right head for my R65LS?
Post by: nhmaf on April 07, 2011, 12:36:29 PM

The later series (1981-on) R65 bikes did have larger valves.  Earlier models had 38mm intake, 34mm exhaust, later modesl has 40mm intake, 36mm exhaust.

There is a way to tell from some numbers stamped into the head casting, but I cannot recall at the moment.  I suppose you can always measure the valve diameters!

Title: Re: Is this the right head for my R65LS?
Post by: Red_Hen on April 07, 2011, 12:45:08 PM

Definitely! I can ask my guy at the machine shop to measure them - I'm pretty sure this is the correct head and so did Rob Valdez.