SOHC.co.uk Forums > The Black Bomber Board
Later Alloy Body Oil Pump in K0 Bomber
AshimotoK0:
How many miles has your K1 done Dave? From the looks of your strip-down, the cams & rockers looked pretty damn good to me (apart from the PO careless damage to the damper ring flanges) .. So IMHO it may be better to put the old pump back and let the bike warm up on idle and it will be good for many more miles. If you can wait till the end of the week I am visiting the guy with the NOS oil pump and he may well have a Service Bulletin on the early oil pumps. He got most of the stuff from the long gone Honda Service dept. that was in Nottingham when the bikes were new. I can also compare the NOS oil pump to an early bomber one ..it may well be that they modified the design slightly.
jensen:
This is the earliest one, fitted in my bomber, look to it closely and you'll understand why all the early bikes having camshafts and rockers damaged....
The modification was simple, but took a lot of work, the whole pump had to be disassembled. Some dealers however didn't, and just rotated the screen 90 degrees. A handy person can do that without disassemble the pomp.
AshimotoK0:
If anyone wants a NOS filter screen sealed in bag I have a couple at £12 ea plus £1.50 UK post. DS charges £45 special order.
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MrDavo:
I’d like to have the 30% extra flow from the later pump if I can, just for peace of mind.
Last night I read all the posts on the twins forum that Google could find about oil pump upgrades, the consensus from those that had done it with no problems was to use the conrod from the original pump, as there were small differences at the ‘big end’, but fitted with the steel piston from the new pump. That way the dimensions at the clutch end are perfect, but the action is exactly the same.
I’m going to pull it apart and have a good look and a measure, as I have been turning the engine over on the starter to get oil pressure I’ll look for any damage from misalignment.
The upside is that my kickstart return spring is pathetic, I’ll take the opportunity to fit a new one from CMS.
K2-K6:
I wondered what this one is? As it seems to have a different alignment to others.
https://www.ebay.com/itm/71-Honda-CL450-Oil-Pump/270370216947?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D1%26asc%3D20150313114020%26meid%3Dbc7d28487f4b40b3922a637ec8e6e992%26pid%3D100338%26rk%3D17%26rkt%3D30%26sd%3D142564278298%26itm%3D270370216947&_trksid=p2141725.c100338.m3726
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Appears to make an attempt to alter the sideways loading on the oil plunger.
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