jemberlin
Well-known member
I have a 74 CB750 that I'm having some mechanical problems with. Wondering if there are any good and reliable mechanics in Toronto that specialize in older motorcycles?
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Looking for reliable mechanic for older Honda CB750
- Thread starter jemberlin
- Start date
Doesn't Ted (Rosey Toes motorcycles) like old bikes? Hit or miss on whether you consider him good or reliable though. People are all over the map on their opinions of him.
Getting a mechanic to touch an old vehicle gets cost prohibitive very quickly. I like Robbo's plan on trying internet diagnosis first to see if people can help you for free instead of many hours at shop rate.
Getting a mechanic to touch an old vehicle gets cost prohibitive very quickly. I like Robbo's plan on trying internet diagnosis first to see if people can help you for free instead of many hours at shop rate.
Trials
Well-known member
Does it need parts because that is what the bigger problem will be for almost anyone, great mechanic or otherwise.
jemberlin
Well-known member
Two issues. First issue is that it recently started making some rattle like sounds from the bottom right of the engine. I've tried adjusting the cam chain tensioner a number of times but this has not helped. Second issue is carbon fouling of plugs and needing to pull them often to either a)clean em or b)change em.
I'm not super mechanically inclined and this is my running bike I'd like to keep running. If I start working on it myself I know it'll take me all summer and then the riding season is over.
For carbon fouling you could try a strong dose of fuel-injector cleaner in the gas. This is not the best approach but has very few downsides and may help fuel atomize better if there is some buildup in the carbs. I shudder to think what a rebuild of a four carb rack would cost at a shop.
Trials
Well-known member
How much backlash is there in the primary drive chain? Sadly they have those.
to test it, when the bike is shut off, put it in gear, how far forward and backwards does it roll?
That distance represents the play in all your gears and chains.
Would pay to have a compression test done anywhere or by yourself.
& have the valve clearances been checked in this century?
oh and what is your oil consumption like?
to test it, when the bike is shut off, put it in gear, how far forward and backwards does it roll?
That distance represents the play in all your gears and chains.
Would pay to have a compression test done anywhere or by yourself.
& have the valve clearances been checked in this century?
oh and what is your oil consumption like?
Trials
Well-known member
1974 CB750 motor that is running black soot :/ if you don't start with oil consumption and compression test there is no sense in servicing anything else, if it has poor compression it also has poor intake vacuum and that will make the carbs act up as well as impossible to balance.
Robbo
Well-known member
1. Which plugs are fouling?
When sitting on the bike, plug #1 is on outside left and #4 is on outside right.
2. Are they dry, black carbon fouled...or wet fouled?
3. When you have replaced the plugs, will it start and run on all four cylinders? Do the exhaust pipes feel equally hot? If not, state your specific symptoms by cylinder (1 to 4).
4. Do you know when the last time a tuneup was performed on the bike? Mileage then and now?
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jemberlin
Well-known member
Yeah, I've tried this already. I'm also shuddering at the cost of potentially servicing this old bike.
jemberlin
Well-known member
1. All plugs are fouling, but 2 and 3 are the worst
2. 1,2,3 are carbon fouled and 4 is sometimes a bit wet
3. All four cylinders work and fire. The pipes at the back don't get super hot but they are blazing hot up near the engine
4. Guy I bought it from did a quick tuneup on the bike a month or so back but the noise from the engine has shown up after this.
jemberlin
Well-known member
Where are they located?
Max527
Well-known member
So true.
Robbo
Well-known member
4. What exactly did the guy do as part of the tuneup?
5. Are you running a points ignition or aftermarket electronic ignition? If aftermarket, which one?
6. Stock airbox and stock air filter or ???
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Please dont say pods. Please dont say pods. Please dont say pods.
TK4
Well-known member
How many miles/kms ?
This doesn't sound like a tune up issue.
Check compression, no squeeze = major teardown.
Major motor work is a wallet drainer.
This doesn't sound like a tune up issue.
Check compression, no squeeze = major teardown.
Major motor work is a wallet drainer.
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