I read somewhere that Honda uprated the oil pump on the later RFVC engines. Does anyone know if this is correct and if so which pump do I need?
Cheers
James
Aye James,
Does this thread and URL from the XL600R - The XL Board help?
" (Date Posted:05/16/2007 00:16:56)
Here is URL to comments posted by a 1984 XRL owner regarding cam oiling problem and solution
http://www.advrider.com/forums/showthread.php?t=51126&highlight=flow+head The content is cut and pasted below. I just noticed the post below had noted the different diameters of the banjo bolt holes.
from Tim McKittrick:
I had a lot of problems with cams and rockers on my XL600R motor (which has the same oiling system) - to the tune of five sets before I figured it out. You may have had a high speed oiling problem but my trouble was all start-up related. At lower temperatures (below 50 F) there is insufficent oil flow to the head through the itty-bitty oil pip, leading to gallling. Once the engine produces a little heat and thins the oil everything is just dandy. The result is your engine runs for a few minutes with little or no oil to the head every time you start it up. Much has been written about worn oil pumps and high flow aftermarket replacement pumps, but there is a better way. I replaced the line to the head with a piece of Aeroquip braided hose and a few 1/8" NPT fitttings into the case and head and ran the bike another 35,000 miles with nary a problem- and it only required valve adjustment once. And this was using a high lift cam without hardened rockers
I only deduced the cause of the failures after a local aircraft mechanic told me about a similar problem with Lycoming airplane engines- unless properly pre-heated in the winter these engines would gall their cams in exactly the same way as my Honda, only it cost a LOT more to fix. After modifying my motor I began ice racing it (in temps down to -20F) both to prove my alteration was valid and to have a way to play with bikes in the winter.
I think the oiling to the head is insufficent on all of the Honda RFVC engines and I would not run one without making the change. I've modified three engines and none of them have had a subsquent cam or rocker problem. It's relatively cheap and easy to do, and you will never have to worry about the top end ever again. "
My regards, Bill.
