Vavle guide seals

[floridaredneck]

Anyone know the part # for these.

2004 Raptor 350


thanks

 

[twelveoclockpimp]

Call up your yammy dealer...

 

[floridaredneck]

There dicks and i try to avoid them as much as i can.

 

[jasonp]

yamahasportplaza.com look it up, best prices I've found.

 

[floridaredneck]

How hard is it going to be to install these? Do you need a valve spring compressor.

 

[jasonp]

yes.. most of the time though you'll need new guides as well, if this is what is causing your problem.

 

[floridaredneck]

3Y1-11133-11-00 GUIDE, VALVE 1


Is that it?

 

[jasonp]

yes.. you'll for sure have to pull the head and have a machine shop put new guides in. I'd make sure this is your problem first. The intake valve will be wet with oil and valve. The exhaust will look wet as well.
Also vito's racing sells kibblewhite guides that are top notch that I believe are cheaper.
Does your bike have alot of hours on it?
I'd have to look it up for the part number...

 

[griff]

What problem are you having exactly?

Valve guide seals usually last a long long time, unless they are exposed to a contaminant in the oil.

As for the valve guides themselves, how many hours on this engine?

 

[floridaredneck]

Theres alot of miles on the engine. Its already been bored .20 over. The bike will smoke when it is cold.

 

[griff]

Theres alot of miles on the engine. Its already been bored .20 over. The bike will smoke when it is cold.

Would you more than 20,000 miles?

How much time on the rings right now?

I would just replace the seals if you are gonna pull it. I seriously doubt the guides are that worn though. Of course you can always check the throw-out (if there is any) on the valve guides with a valve-stem in there.

 

[floridaredneck]

Not 20 000 miles probably 3000 or so. Yeh thats what i was going to do is just replace the seals. And maybe the and the guides if i have too.

 

[jasonp]

sounds to me like someone didn't do a good hone job on the cylinder.
I would do a leak down test and check to see where the problem is coming from.

 

[griff]

sounds to me like someone didn't do a good hone job on the cylinder.
I would do a leak down test and check to see where the problem is coming from.

I was kinda think'n the same thing.

Those valve seals are pretty young if its a 2004. The valve guides are gonna be fine, that engine doesnt have enough run time on it. IIRC, theres no valve-stem deflection either because of the rocker-arm design they use.

 

[floridaredneck]

why does it only do it when its cold?

 

[griff]

why does it only do it when its cold?

Rings and cylinder walls expand slightly with heat. So when its hot, its sealing a little better.

This can make a difference depending on the hone that was done.

 

[floridaredneck]

So get it bored over again? Or just try new rings?

 

[jasonp]

Do a leak down test. This will tell you what step you need to go to next. Then tear it down and confirm the problem. Measure how much piston to cylinder wall clearance you have and make sure it is with in spec. If not rebore. I would say its going to need a rebuild and get new valve seals as well.
The reason why you see smoke at start up is because the engine is cold and less likely to burn the oil that is passing by the oil ring. As the engine warms the rings like griff said will start to expand slightly and seal better but also the combustion chamber is hotter so you won't see the blue so much as the exhaust smoke will start to look black.

 

[floridaredneck]

How or what is a leak down test? Is it a compression test or what? Never heard of it before.


Thanks guys

 

[griff]

A leak down measure leakage for the whole cylinder. The test is similar to a compression test in that it tells you how well your engine’s cylinders are sealing - But instead of measuring pressure, it measures pressure loss.

A leak down test can help tell you if its the rings or valves, I use a stethoscope myself to see where the leak is coming from (rings or valves).

5-10% loss is not unusal for typical loss in a good cylinder. Anything over 15% is too much IMHO.