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right side cylinder smoking

mike1969
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Location: w.pa.

right side cylinder smoking

Post by mike1969 » Mon Oct 06, 2014 6:41 am

I'll try this again.
I picked up a 305 Dream 2 years ago that hadn't run for about 20 years.
Before I started cosmetic work I stared the engine, it sounded great and plugs looked good.

Now after the bike is painted and engine is in bike the right cylinder has started smoking.
I never got the bike on the road due to carb and petcock issues but ran it for about 15 to 20 min. running a few minutes at a time before it started smoking. Checked compression and it's 135 lbs. plus in both cyls.
Any ideas on where to go from here?

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G-Man
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Post by G-Man » Mon Oct 06, 2014 7:04 am

Oil control rings may be stuck after the long sleep.

G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

mike1969
honda305.com Member
Posts: 720
Joined: Sat Feb 06, 2010 6:53 pm
Location: w.pa.

right side smoking

Post by mike1969 » Mon Oct 06, 2014 7:10 am

Thanks Gman. What's the best way to unstick them?

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G-Man
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Post by G-Man » Mon Oct 06, 2014 9:28 am

Mike

Whatever the reasons you'll have to pull the head and barrel off to investigate.

That's all I can think of for now unless you or a previous owner poured oil into the exhausts to preserve them...

How badly is it smoking? If not too bad I would be tempted to just ride it a little to see what happens.

G
Last edited by G-Man on Mon Oct 06, 2014 2:28 pm, edited 1 time in total.
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

mike1969
honda305.com Member
Posts: 720
Joined: Sat Feb 06, 2010 6:53 pm
Location: w.pa.

right cylinder smoking

Post by mike1969 » Mon Oct 06, 2014 2:19 pm

Gman, Not was I was hoping to hear. I did put oil in cylinders before starting it for the first time but was thinking it would smoke right away. It didn't start smoking until after it ran for about 15 mins.
It's smoking pretty good but I guess it wouldn't hurt to run it a while to see what happens.
Thanks,Mike

mike1969
honda305.com Member
Posts: 720
Joined: Sat Feb 06, 2010 6:53 pm
Location: w.pa.

right side smoking

Post by mike1969 » Tue Oct 14, 2014 5:06 pm

Got the petcock and carb situation somewhat figured out. Ran the bike for another 15 mins. and the pipe quit smoking! Guess it was the oil I used to lube the cylinders before starting gathering in the muffler burning off. Phew!

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G-Man
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Post by G-Man » Wed Oct 15, 2014 2:13 pm

It always pays to do nothing for a while....

G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

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