Zoran I screwed up.Rusty Yoshi cam...

[TOLAROS]

Really pissed off...I had the Yoshi cams in the box.In the same box I put the used R1 rear caliper.Every item was wrapped around good but still some brake fluid mist was around the caliper bag.Result: one of the cams got rust.I sprayed him with rust remover and rubbed the rust with sandpaper(600).Here is result,i really had no patience to try again

[TOLAROS]

Some more

[TOLAROS]

Few more

[TOLAROS]

Questions:
1)Can those black stains be removed?If yes how?
2)Will there be any problem if I install the cam?

Really acted like jerk...forgot the rule that says keep stuff off brake fluid,it sucks...

[macop1104]

those cams are junk. I'll trade you a pound of Feta cheese and a bottle of cheap Ouzo for them...

as long as the bearing surfaces or the cam lobes aren't pitted you shouldn't have a problem.

[TOLAROS]

Mike what is pitted?
As for feta cheese,I just ate a really big piece with lunch...

[yorkie_chris]

pitted, tiny rust holes in surface

[TOLAROS]

Here are some close ups of the bearing surfaces.Anyone with eagle eye that can see something i don't is welcome...

[#1 tuner]

Run them, or just send them to me! I don't have much to trade right now but would give them a good home inside my motor.

[zoran]

Clean and wash them good and run it. Keep eye on sprockets. Sprockets can be changed.

[TOLAROS]

Just got back from my machinist friend.I got lucky after all:the bearing surfaces weren't touched.
Zoran:
1)should I use an iron brush or sand paper+rust remover?You say wash them but with what?
2)How can sprocket be changed?Yoshi doesn't make any.Or I need sprocket specialist?
2)I will install them around Christmas.Until then is it a good idea to keep cams submarined in a box with engine oil?
Thanks

[zoran]

You can use fine wet sand paper and wd40.
Sprockets are pressed on, they are stock, nothing special. Hard part is pressing them in right spot.

[TOLAROS]

So I can use the sprocket of the stock cam which is on the bike right now when I put the Yoshi's on.That's reassuring!
About pressing in the right spot(should it be necessary) I will ask you when time comes.
Really thanks.

[zoran]

Yes, it has to be pressed in the right spot, it is your cam timing. Or you can time them different.

[TOLAROS]

All cams have the same sprocket.The only thing that differs is sprocket's position in relation with the toothed shaft.Also I can see letters A,B,C,D printed on the shaft's ass.
So we can make one mark using a hard knife on the shaft's ass that would be aligned with the arrow which is carved on the sprocket.
Then we press out the sprocket and install a new one(or the old stock shaft sprocket).As long as the mark is aligned with the arrow we have the same timing.

(I have a feeling though that the whole "press-out,press-in Daniel san" thing is more difficult than I make it seem...)

Originally Posted by zoran

You can use fine wet sand paper and wd40.

How about soda blasting?

[zoran]

That is correct, all sprockets are same. Press in and out is easy on hydraulic press.
Right way would be to press them in, check timing, move if needed and than tack weld.
Or buy adapters and have sprockets bolted to them and adjustable.
You want bearing surface polished, rest is not important.

[TOLAROS]

Originally Posted by zoran

That is correct, all sprockets are same. Press in and out is easy on hydraulic press.
Right way would be to press them in, check timing, move if needed and than tack weld.
Or buy adapters and have sprockets bolted to them and adjustable.
You want bearing surface polished, rest is not important.

1)You check timing directly(with the instrument that looks like clock) or indirectly(making marks before pressing out)?
2)Sprocket has 36 teeth.So each teeth is 360/36=10 degrees timing.In order to be safe AND keep the way power delivers close to stock how many degrees one can vary?1-2?
3)What is tack weld?
4)I have an aluminum deoxidizer liquid lying around.Can I polish bearing surfaces with that?

Thank you

[zoran]

1. with instruments, degree wheel and gauges
2. each teeth is 20 degree
3. spot weld, welding on couple small spots
4. anything that polishes metal

[TOLAROS]

Then I'm screwed...you have pm

[yorkie_chris]

If you are storing cams or parts give them a thick coating of engine oil, wrap them in rags with some oil soaked in and then put in plastic bag. Parts will last for years like this even in damp shed or whatever.