I'm working my way through an otherwise full restoration and have the motor out of the bike. When I got it, it had not been run in many years... however it turned over with ease and still had pretty clean looking oil at the right level. I cleaned it up and now I'm debating whether it is wise to break it down or give it a go without any tinkering/rebuilding.
I'd just like opinions on the nature of the 305 motor at 40 years, 9500 miles and what appears to be the original gaskets. I'm feeling the 'might as well' bug just looking at it on my benchtop... and a full gasket set is near beside it. Just exploring my options and weighing the pro's and con's. I am not experienced with motorcycles, only automobiles, but very capable and happy to learn.
Tom
9500k motor
Re: 9500k motorAre ya prepared to be able to know bad parts and what they look like?
Do ya have parts books/fiche and bike service manual? Do ya have the money/time when/if ya need parts? Do ya have the tools? How old are ya? Would ya add your location to your name location?. ..............lm
Check the valve adjustment, change the oil, clean the filter and check the compression.
If it's okay, why mess with it unless you want to risk breaking something that isn't broke. Mine had 13,000 miles and had been sitting since 1979, still has 150 psi and no smokee. 66 dream, 78 cb750k, 02fz1, 09 wing
Re: 9500k motorTom, welcome. As lm asks, please edit-in your location within your profile. Also, you've not mentioned which model or year of 305 that you have! I'd be inclined to nail the motor back in the frame, tune it to spec (static timing, carb setting), gas it up and run it before embarking on any major invasive surgery. Inspect & clean the oil spinner (filter) whilst taking care to reassemble the filter/shaft/washer/cover in the correct order, run it up to temp, dump the old oil, clean the filter again, replenish with fresh oil and ride it locally for a spell. See how it sounds and behaves before deciding how deep to delve. G'luck, whatever your decision. Giving it a test run sounds reasonable. I will go with that. It seems to have been maintained well while it was in use and stored just fine. The tires were still properly inflated whitewalls.
I bought all the manuals from a link I found on this site and enjoy going by the book. I'm 30 years old and renovate old houses ~(1890's-1920's) for a living. I've also restored vintage machinery. I love to learn. The bike is a 1966 CA78 Tom
Old bike - run it first!I echo e3steve's advice. Clean up what you can, especially oil filter, fresh oil, carb's might need cleaning, clean the points and set them correctly, probably a fresh battery - and give it a whirl. I've got 26,000 on my 1966 cb77 and uses very little oil and has never been rebuilt. There's lots of info on this forum for doing a complete tune-up.
Good luck! GG
I think I would be inclined to give it the benefit of the doubt. Do what has been suggested regarding changing oil and give it a chance. Give it enough running to give the rings a chance to flex and you may be pleasantly surprised. If not. Pull it to bits and rebuild. These engines are as tough as old boots and think of the bragging rights!
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