Adjusted valves....STILL ticks

**Kerick** · 11-16-2009, 11:18 PM

Well Mike just pointed out that I have an auto cam chain adjuster..........SO looks like itll NEED to be torn down just to do the cam chain so Im probobly gonna do a top end rebuild...Is there a kit to do this with all gaskets, seals, parts?

**code200k** · 11-16-2009, 11:24 PM

dennis kirk has the gaskets for the top end ,piston/ring idk bout seals though..also im sure egay has everything

**Erics350x** · 11-17-2009, 12:34 AM

You say it smokes? Maybe its piston slap?

**Kerick** · 11-17-2009, 01:08 AM

What causes a piston slap? How do tell how big my current bore is?

**Erics350x** · 11-17-2009, 09:28 AM

A topend thats worn enough will make piston slap. Its exactly what it sounds like, the piston slaping around in the cylinder.
I would also do the cam chain as everyone else said. It would suck to install a new piston kit and have to tear it back apart for the chain.
You can in most cases pull the head and find marking or numbers on top of the piston to tell the current bore size. You will need a over sized bore piston kit. I'd pull the cylinder and take it to a local machine shop and have them look at it to find the current size and what size kit you need.

**85Tecate** · 11-18-2009, 05:51 PM

Originally Posted by Erics350x

A topend thats worn enough will make piston slap. Its exactly what it sounds like, the piston slaping around in the cylinder.
I would also do the cam chain as everyone else said. It would suck to install a new piston kit and have to tear it back apart for the chain.
You can in most cases pull the head and find marking or numbers on top of the piston to tell the current bore size. You will need a over sized bore piston kit. I'd pull the cylinder and take it to a local machine shop and have them look at it to find the current size and what size kit you need.

I agree 100%. If it IS piston slap that cylinder is going to need bored.

**Kerick** · 11-18-2009, 05:56 PM

How can you tell if the piston slapped? Is the cylinder all scrattched up. Im definately gonna do a ring/valve/chain job over the winter just need to get some cash amd need more garage space lol

**Bill** · 11-18-2009, 07:19 PM

I would say it is the timing chain I had the same problem on a 400 ex.

**Dirtcrasher** · 11-18-2009, 07:53 PM

Milkman took the words out of my mouth.

These old machines need timing chains AND sometimes tensioners.

I'm not educated on a Yamaha auto or manual tensioners, but they just hold something in place. They DON'T do much work, but the timing chain and gears sure do.....

I must admit, I almost never find worn TC gears, just a worn and stretched chain from doing it's job for 25 years.....

**Kerick** · 11-26-2009, 01:34 AM

Originally Posted by 85Tecate

Those are philips head screws if i remember correctly arent they? The way i try to get those out when theyre siezed is to hit the handle of the screw driver as im trying to loosen the screw. Sometimes works, sometimes doesnt. They make a nice tool specially for stubborn screws like that. You actually put it on the screw and smack the end of the tool with a

and it turns it when you hit it.

Here is what im talking about. They work incredibly good... http://www.harborfreight.com/cpi/cta...emnumber=37530

Ok time for an update...I went and got the impact screwdriver 85Tecate was talking about and got the cam cover off. One snapped halfway off so ill have to drill and tap that one not a big deal. So I was wondering how to tell the cam chain is too loose it feels pretty snug with some pay but it doent fell terrible. is it supposed to be tight

**oscarmayer** · 11-26-2009, 10:13 AM

order an impact screwdriver set from sears not harbor freight. thise HF ones snap the tip soff easly. the craftsman will last you for years!! I've used mine a ton on trike rebuilding and brake jobs. so that's really your best bet.

**oscarmayer** · 11-26-2009, 10:14 AM

Originally Posted by Kerick

Ok time for an update...I went and got the impact screwdriver 85Tecate was talking about and got the cam cover off. One snapped halfway off so ill have to drill and tap that one not a big deal. So I was wondering how to tell the cam chain is too loose it feels pretty snug with some pay but it doent fell terrible. is it supposed to be tight

there should not be any play in it. it't not a timing belt that has a tiny bit of play. it's a chain and should have no play.
se if you can adjust it to quiet it down, if not, time for a top end rebuild.

**Kerick** · 11-26-2009, 08:07 PM

Originally Posted by oscarmayer

there should not be any play in it. it't not a timing belt that has a tiny bit of play. it's a chain and should have no play.
se if you can adjust it to quiet it down, if not, time for a top end rebuild.

So it should be totally tight?

**85Tecate** · 11-26-2009, 08:10 PM

Originally Posted by Kerick

So it should be totally tight?

Yes, no play at all. The problem with just adjusting it to take the noise out is, even though it may very well adjust to take the noise out, the timing will be off because the chain is stretched.

**Kerick** · 11-26-2009, 08:15 PM

Yea I know I wasnt gonna adjust it i just wanted to see if that could be a problem im definately gonna rebuild it and replace the chain and sprockets aand top end so Im gonna start tearing it down hopefully tomorrwo

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