Vintage and Classic Hondas

Some smoke from the tail

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rij1

Some smoke from the tail

Motor was rebuilt about 100 miles ago. Starts/Runs/Rides/Idles good.
A buddy was riding behind me and noticed some smoke at parts of deceleration.
It didn't smoke at all while giving gas and acceleration that he noticed.
I didn't notice any difference in the bike at all. It still Starts/Runs/Rides/Idles good.
This seems weird to me

I did a compression test about 20 minutes after we got home and with the bike hot both dry and wet
Dry test
#1=80
#2=80
#3=80
#4=90

Wet Test
#1=90
#2=110
#3=110
#4=110

My Bike Information
1982 Honda DOHC CB750F Supersport
4-1 Exhaust with baffle
Stock intake air box
Slow-speed jet #35
Primary main jet #68
Secondary main jet #105
Ventura, California

rij1

Re: Some smoke from the tail

Ooops, I forgot to open the throttle while cranking.
I just tested it again with the oil I had put in the cylinders from the wet test I already did and I got -

Second wet test with open throttle
#1=180
#2=180
#3=190
#4=190

I'm going to have to test dry and hot tomorrow for the normal readings with wide open throttle..

My Bike Information
1982 Honda DOHC CB750F Supersport
4-1 Exhaust with baffle
Stock intake air box
Slow-speed jet #35
Primary main jet #68
Secondary main jet #105
Ventura, California

TOOLS1

Re: Some smoke from the tail

Administrator

In reply to this post by rij1

100 miles? Your rings are probably not seated yet. To really seat your rings, warm the bike up. Then get it into high gear, and let off the throttle. Let the bike idle down to where it wants to stall, and then give it full throttle, letting it lug back up to speed. Repeat this 5 times, and your rings will be seated.
TOOLS

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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

rij1

Re: Some smoke from the tail

There may actually be around 150-200 miles if I really think about it. But I will do that.

Thanks for the advice

My Bike Information
1982 Honda DOHC CB750F Supersport
4-1 Exhaust with baffle
Stock intake air box
Slow-speed jet #35
Primary main jet #68
Secondary main jet #105
Ventura, California