CL350 Top end rebuild

fasterspider · Posted: Wed Feb 17, 2010 2:48 pm Post subject: CL350 Top end rebuild

My Scrambler developed a knock at idle after a spirited 15 mile run on the 101 freeway at WOT.
So I have the engine out of the bike and almost apart.

My cam shaft is scored and worn.

The right piston was the big culprit although there was other major problems too.

The cylinder wall is scored.

The cam chain destroyed the guide and then some.

The motor is toast as far as I am concerned, it is going to be cheaper to buy another engine and put the new parts I bought for this one in it instead of buying all the parts I need to make this engine right again.

Hoodellyhoo · Posted: Wed Feb 17, 2010 6:07 pm Post subject:

Bummer! How many miles are on the bike?

05c50 · Posted: Wed Feb 17, 2010 8:57 pm Post subject:

So, what do you think happen? Kinda looks like oil starvation. Oil pickup plugged up or maybe oil pump went south?

.........Paul

fasterspider · Posted: Wed Feb 17, 2010 9:38 pm Post subject:

FalldownPhil · Posted: Wed Feb 17, 2010 10:03 pm Post subject:

Ray,
Instead of calling this thread "350 Tear Down" you should have called it
"350 Torn Up" ROTFL

How about a picture of that beautiful cam chain roller?
It is amazing that your bike ran as well as it did for as long as it did.
It is great testimony for the durability of that little Honda. The pictures
don't really show all the damage. One tuff bike.
Good luck with it Ray.
Very Best,
Phil

fasterspider · Posted: Wed Feb 17, 2010 10:20 pm Post subject:

FalldownPhil · Posted: Wed Feb 17, 2010 10:37 pm Post subject:

Well that is good news.
I suppose that next you are going to tell me the
new cam chain roller is round instead of oval too.
Just imagine how well it will run with a rebuilt engine.
Best,
Phil

fasterspider · Posted: Wed Feb 17, 2010 10:57 pm Post subject:

Bikegeezer · Posted: Thu Feb 18, 2010 7:34 am Post subject:

Ray,
It looks like the mangled roller in that tensioner siezed on its shaft. Fear of something like this is the reason I tore mine down before even trying to start it, even though it had only 7K showing on the clock. One thing really odd about yours is that the small roller looks to be in perfect shape, while the one that's torn up is maybe 1/2 of it's original size. But it appears to still have the original bead around most of the OD. I'm thinking that somehow, someone fitted an incorrect roller in that tensioner assembly. I'm sure you adjusted the cam chain tension, but was it quiet?

Stu

fasterspider · Posted: Thu Feb 18, 2010 9:36 am Post subject:

Russell · Posted: Thu Feb 18, 2010 12:53 pm Post subject:

Good luck with the rebuild.Perhaps a year or so back you seemed a bit reserved about the Scrambler and unsure that it would be staying in the family.Have you become a bit attached?

fasterspider · Posted: Thu Feb 18, 2010 2:25 pm Post subject:

Russell · Posted: Thu Feb 18, 2010 3:26 pm Post subject:

It's odd the way these old bikes can work on the psyche. There are a couple of great all round current bikes in our shed with power to burn etc but the one that brings the biggest smile to my face is the beat up original old CB175 twin. It is FAR too small for me physically to sit on, is about as fast as the push bikes in the shed,has wooden feeling brakes,and suspension that keeps the bodywork from dragging on the tops of the tyres most of the time.Go figure!

fasterspider · Posted: Thu Feb 18, 2010 3:42 pm Post subject:

Bikegeezer · Posted: Thu Feb 18, 2010 7:10 pm Post subject:

[quote="fasterspider"]