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General Category >> Rubber Side Down! >> Bad Rockers - Car Oil?
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Message started by Dave on 04/25/18 at 05:13:18

Title: Bad Rockers - Car Oil?
Post by Dave on 04/25/18 at 05:13:18

I don't really know if this is a low ZDDP issue, a low idle speed issue, or a combination of those. I have never seen a set of rockers in this bad of condition. I bought this engine from a fellow who was going to use it in another bike project that he abandoned.....I have no history on the engine. The inside of the engine is clean and it appears the oil was changed regularly, the piston/cylinder is in good shape and the cross hatch is still visible in the cylinder wall, the cam had a small amount of wear, and the bearing surfaces in the head have a small amount of scratches that is associated with low idle speed and the resulting low oil pressure to the cam. The burnt oil/carbon on the rockers shows the friction was getting the ends of the rockers hot enough to burn the oil.

http://i67.tinypic.com/fnwf8i.jpg

http://i66.tinypic.com/2uzos9l.jpg

http://i64.tinypic.com/2mmembo.jpg

Title: Re: Bad Rockers - Car Oil?
Post by justin_o_guy2 on 04/25/18 at 05:19:08

I'm surprised the cam isn't chewed up.

Title: Re: Bad Rockers - Car Oil?
Post by Dave on 04/25/18 at 05:54:37

The cam had a small amount of wear on the exhaust rocker - but it wasn't horrible and a photo wouldn't have shown anything. I sent it to Lancer for use as a core for welding/grinding a performance cam.

Title: Re: Bad Rockers - Car Oil?
Post by justin_o_guy2 on 04/25/18 at 11:49:14

cam had a small amount of wear on the exhaust rocker -

Interesting.
And the followers? Is exhaust more damaged?

Title: Re: Bad Rockers - Car Oil?
Post by batman on 04/25/18 at 12:39:42

Dave ,I don't know if we seem to mention this often , but what if the brass oil jet were missing(lost) from the oil galley or it's O-ring was damaged ,wouldn't that send more oil to the trans but less to the top end? It might be something to check on when dealing with a used motor.

Title: Re: Bad Rockers - Car Oil?
Post by Papa Bear on 04/25/18 at 13:15:16

Looks like it was running on Dollar Store "SA" grade oil. :-[

Title: Re: Bad Rockers - Car Oil?
Post by justin_o_guy2 on 04/25/18 at 14:54:12

6F6C79606C6339350D0 wrote:

Sounds logical.

Title: Re: Bad Rockers - Car Oil?
Post by DragBikeMike on 05/05/18 at 20:13:39

Is there a chance that the cam in this engine was a DR 650 cam? Did it have oil holes drilled in the cam lobes?

Title: Re: Bad Rockers - Car Oil?
Post by batman on 05/05/18 at 21:38:33

DBM good question!

Title: Re: Bad Rockers - Car Oil?
Post by justin_o_guy2 on 05/05/18 at 21:51:11

Does your cam have pierced lobia?

Title: Re: Bad Rockers - Car Oil?
Post by Dave on 05/14/18 at 04:05:50

26202F53515652620 wrote:

Is there a chance that the cam in this engine was a DR 650 cam? Did it have oil holes drilled in the cam lobes?

I found a picture of the cam that came with those rockers. It was a Savage cam - the intake rocker didn't look bad.....the exhaust side does.

http://i63.tinypic.com/j6o3e0.jpg

Title: Re: Bad Rockers - Car Oil?
Post by batman on 05/14/18 at 07:50:00

excessive idling with the bike sitting on the kickstand , and to low an idle speed?