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Message started by Chopped on 03/23/09 at 15:37:22

Title: Valves a tappin
Post by Chopped on 03/23/09 at 15:37:22

Had some strange noise been coming from the top end so I decided to adjust the ol' valves! Pretty sure I did it right... couldn't get the timing inspection pulg out so I just took off the side cover. Figured out the TDC for the Intake... and went to it! on I couldn't get a .002 in and one of my exhaust was .006. I got them all .004. Now to see how it sounds... Oh, I adjust the cam chain too! came out 1 click on the tensioner... tightened her right up. now I need to reassemble and take her for a ride. Will repost when I have news, either good or bad!

Title: Re: Valves a tappin
Post by Wolf on 03/23/09 at 18:09:55

:-X

I see you, but you must be busy.... I guess the adjustment worked?

Wolf

Title: Re: Valves a tappin
Post by Chopped on 03/23/09 at 18:31:06

nah... just spending tiem with the little one... will test ride later tonight!

Title: Re: Valves a tappin
Post by Chopped on 03/23/09 at 20:32:38

so put her back together and I still have a bit of noise coming from the engine... kinda like a real low soft knock... perhaps its just the timing... any ideas... and if it is.... how in the hell to I set or fix the timing?

Title: Re: Valves a tappin
Post by verslagen1 on 03/23/09 at 21:32:02

My '88 had a knock or would have a knock if I just put it back together.
Turned out to be a burnt piston.
We tried lot's of things to figure it out. Compression test, feeling the piston go up and down, feeling the crank round and round, back and forth, using a screwdriver to push the cam forward and back.
After taking it all apart, the only evidence we found that you've might of seen if I had a borescope would have been a small indentation on the outside edge of the piston and the melted aluminum at the top of the cylinder.

Title: Re: Valves a tappin
Post by Chopped on 03/24/09 at 14:54:55

awesome... I need to tear her apart again anyway... got on the road today and the cheap, left side, crank case gasket I got from the stealership busted on me and OIL went everwhere... didn't notice it until I got to a stop and the bike was smoking more than usual.... looked down and oil was shooting out everywher... all over the frame (rear tire and rotor... covered... ie no brakes)! I barely made home! Any sugestions on how to fix it, ie home made gasket.... anything?

Title: Re: Valves a tappin
Post by Chopped on 03/24/09 at 20:25:02

Ok.... well tore it down to the frame.... Im gettin good at that... have the engine on the table (not the kitchen)! Only took me an hour!

Tear down engine tomorrow.... check piston, timing, cam chain (again)

Order new gaskets.... Crank Case both sides.... head.... head cover....

Wait on parts....

PAINT.... got a marbled bronze for the tank and tins... should look pretty good! Thanks for all help on here guys!

Title: Re: Valves a tappin
Post by diamond jim on 03/24/09 at 20:51:23

You guys that can just yank the motor, pull it open and replace a piston truly have my respect.

Title: Re: Valves a tappin
Post by Chopped on 03/24/09 at 20:58:56

still a learning process... but I am pretty good with anything mechanical... I just got to figure out how to do it and keep the timing... thats a new one for me on these things... cars are easy!

Title: Re: Valves a tappin
Post by diamond jim on 03/24/09 at 21:01:58

72455C5C64454240595E300 wrote:

Oh, I adjust the cam chain too! came out 1 click on the tensioner... tightened her right up...

I didn't know it could be clicked. I thought it just automatically pushed out. Is this the slavy or stock?

Title: Re: Valves a tappin
Post by Chopped on 03/24/09 at 21:07:09

I asume its stock... but there is grooves on the side....???? wierd then?

Title: Re: Valves a tappin
Post by diamond jim on 03/24/09 at 21:13:32

Maybe it was sticking, you moved stuff around, the spring pushed and "click"? That sound plausible?

Title: Re: Valves a tappin
Post by justin_o_guy2 on 03/24/09 at 21:14:11

There is some thjought that one of the reasons for the variables in how long a cam chain lasts, aside from oil, is that the heating & cooling of the engine causing the cylinder to get taller & shorter, the cam chain adjuster "clicking", locking in place, then the cylinder "grows" stretching the chain hard. I am leaning toward removing alternate teeth on the adjuster & see how that im[pacts the chain wear.

Title: Re: Valves a tappin
Post by verslagen1 on 03/24/09 at 21:58:47

grooves should be on the bottom.

How about a pic?

Hey is there a plastic piece sticking out the bottom?

http://i7.photobucket.com/albums/y269/virago125/verslavy4.jpg

Title: Re: Valves a tappin
Post by T Mack 1 on 03/25/09 at 06:04:21

2B262E2220212B2526224F0 wrote:

You guys that can just yank the motor, pull it open and replace a piston truly have my respect.

So I wonder what you think of a person that buys the bike with the engine in pieces, in boxes and the bolts in a plastic tub.... ((except the head bolts which were stuck in a pieces of cardboard...)) ::)

Title: Re: Valves a tappin
Post by diamond jim on 03/25/09 at 06:11:21

4D3454787A7228190 wrote:

I'd say the only tools YOU needed for assembly was a paper clip and chewing gum wrapper, T Mackgyver!

Title: Re: Valves a tappin
Post by Chopped on 03/25/09 at 07:45:45

Don't forget a little duct tape and an avacado seed!

Title: Re: Valves a tappin
Post by SuziQ on 03/25/09 at 20:02:33

0A3D24241C3D3A382126480 wrote:

I removed the timing inspection plug by fabricating a key from a flat round washer. Started out with close fit slightly oversize and filed and chamfered for a perfect fit into the keyway. Even then it was so tight I had to grasp the washer with a large "C" clamp and shock it loose with a hammer. It sits on a rubber "O" ring at the bottom of the threads. Now I just torque it up finger tight with a fibre electrical washer. Never a scratch but take care the aluminum is so soft.

Title: Re: Valves a tappin
Post by Chopped on 03/25/09 at 20:37:28

Ok... Ok... took the head off earlier... No metal shaving...warped areas... but a huge amount of carbon build up... So good news is no new piston needed... but I think I will have to do some more fabricatin.... one of my bolts that holds the head cover on.... stripped! darnit!

Title: Re: Valves a tappin
Post by verslagen1 on 03/25/09 at 21:44:00

Check all the bearings, main, rod, and wrist pin.
Spin the crank and check how they feel.

Title: Re: Valves a tappin
Post by Chopped on 03/26/09 at 08:14:59

Everything felt smooth, but when I looked at the cam chain tensioner... it had an oval groove on one side and obvious marks on the tensioner housing were the tensioner had came out to far and started eating away at the edges.... if that makes sense... Will post a pic later when I get off work!