Topic: NEED 450 ENGINE HELP PLEASE

[digiacomo racing]

 Today i was removing all the covers from my 450 engine. When i took off the cam cover i noticed marks on the exhaust  cam lobe. how big of a problem is this? do i have to take the head off to get the cam out? if so should i then bore the cylinders and replace the positions? i did notice a set of cams with the same marks on the exhaust cam on ebay. link posted under my pic. what should i do. please help.









http://cgi.ebay.com/ebaymotors/Honda-CB450-CB-450-1971-Cams-Cam-Shafts-Intake-Exhaus_W0QQitemZ360138791096QQcmdZViewItemQQptZMotorcycles_Parts_Accessories?hash=item53d9f1d8b8&_trksid=p4506.m20.l1116#ht_1330wt_1199

[RRRToolSolutions]

I have rebuilt and restored dozens of engines. The CB450 Honda was easily the most interesting and complicated of all of them.

Get a shop manual. The cams are marked and are made to align with the marks inside the head. You'll need a cam chain tool to both seperate and replace the press links of the chain. That chain routes through 13 seperate sprockets and is 128 links long. Those ends holding the cam come out and allow you to remove the cams without taking the head off. I loved the challenge and is the whole reason I picked the CB450 Honda to restore - that crazy and most unique of valvetrains! Without the manual and a thourough study of the design, you will pull your hair and it's not likely you'll get the torsion bars back together without some manual guidance.

An absolutely wonderful machine and worth every hour of the 350 hours or so I spent - but doing it without the book, bad idea.

Regards,
Gordon

[Bird76Mojo]

You can always visit www.hondatwins.net and ask nicely for assistance. A kind gentleman there named Bill even sells manuals on CD that are way better than any other book you'll find. All in all there's lots of members there with several of years of experience at that site.

GB