Author Topic: 73 CB350F, runs! but does not run well  (Read 1187 times)

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Offline rboe

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73 CB350F, runs! but does not run well
« on: June 10, 2012, 08:45:56 PM »
Bike has not run since 85 or so, got her running today but it dies when the choke is turned off (I can get to about 90% off and she dies). While sitting on the bike, the far left exhaust exhaust is only warm, the next one is darn hot, the other too are very very warm.

Could be older gas (used the tiller gas which has been sitting a few months) and the sea foam, but I have not messed with points and carbs since about 84. Any skill set I used to have is pretty darn rusty.

I'm hoping the collective wisdom has some pointers for me.  ;D

(oh yah, that front brake sucks, I went down the block and back  ::)  )
1974 CB350F
2008 XR650L
2012 Griso SE

Past iron
1971 Suzuki TS125
1977 Honda CJ360T
1981 Kawasaki 550Ltd
2000 Moto Guzzi Quota

Offline rboe

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Re: 73 CB350F, runs! but does not run well
« Reply #1 on: June 10, 2012, 08:48:30 PM »
I gotta add, it is quite the thrill to pull bits off, mess with the bike with the impression you are doing good things but not really knowing and having the bike reward you with the happy noise is quite the positive feedback. I'm stoked. Still, a lot of work to go.

Sidebar, engine revs good but the tach does not seem to track with it. I have a new tach cable on hand but it may be in the instrument too.
1974 CB350F
2008 XR650L
2012 Griso SE

Past iron
1971 Suzuki TS125
1977 Honda CJ360T
1981 Kawasaki 550Ltd
2000 Moto Guzzi Quota

Offline flybox1

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Re: 73 CB350F, runs! but does not run well
« Reply #2 on: June 10, 2012, 09:08:22 PM »
Time to mess with the carve and timing  ::)

Start by pulling them off, cleaning them with simple green and carb cleaner.  Pull out your main jets and the emulsion tubes under them. Clean the holes. Do the same with the screw out pilot jets. Set your float height. While you are at it, drain and rinse out your tank. New air filter, timing, set your valves and adjust your cam chain.
You know, all the greasy hands busted knuckles stuff outlined in the shop manual for the 3000 mile tuneup. ;D
« Last Edit: June 11, 2012, 08:07:44 AM by flybox1 »
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mineā€¦"

Offline rboe

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Re: 73 CB350F, runs! but does not run well
« Reply #3 on: June 10, 2012, 09:30:04 PM »
New jets, but I did not mess with the emulsion tubes or needles. Tank was freshly coated back in 85 - and never put back in the bike. New air filter is ready to go, valves and cam chain not messed with yet.

Oddly enough the one tube I thought might be dirty I pulled the jet this afternoon and hit it with carb cleaner and that is the one that is running hot. Should have done the rest. Taking the damn throttle cables off is the biggest problem with removing the carbs. :)

Thanks for the tips, more work to do!
1974 CB350F
2008 XR650L
2012 Griso SE

Past iron
1971 Suzuki TS125
1977 Honda CJ360T
1981 Kawasaki 550Ltd
2000 Moto Guzzi Quota