I think she's going to blow!!!
 

Well, after all this money spent, I afraid I might have internal issues...

I came back from vacation, went over to where my quads had been being babysit, changed my oil and filter to Mobil 1 20w50 V-twin and a Wix filter.

I heard a tap when I started it back up after the oil change. At first I thought the oil hadn't gotten to the top end yet. But then it persisted right on.

So then I figured it was the valve clearance. So I took it apart for adjustment and it needed nothing there. The tap is still there... I can get it to go away, and it seems to come and go on it's on some.

It's worst on a cold start... so for a bit there I thought it might be how piston slap sounds in the 400. But today I heard it go away while hot and then come back slightly.

Counting me, 3 people suspect the wrist pin is the noise.



Now, beyond that, today I held it at a steady RPM in neutral for just a bit. It started studdering a little and smoking. I can't tell by the color or smell if it's oil smoke though.... maybe because it's synthetic oil burning?...

I went to look for other evidence, but then I couldn't find my plug wrench to get the spark plug out. The best I could do is look in my exhaust tonight. It sure is black, but heavy sutty... not oily.

I think she's going to blow!!!
 

Nobody?



On only have two leads at this point...
Wrist Pin or 'stuck' Decompressor.

I think she's going to blow!!!
 

timing chain?

I think she's going to blow!!!
 

<div class="FTQUOTE"><begin quote>Originally posted by: 270quadsportguy

timing chain?</end quote></div>

Could be possible.

I think she's going to blow!!!
 

those chains are known for strechin easy way to tell is take of top cover from head and check for slop. I just changed a buddy of mines and it sounded like a timebomb. Chain was wasted. Aint too bad changing the chain couple hours and a few gaskets

I think she's going to blow!!!
 

Did you try taking the screw out of the center of the tensioner and using a small screwdriver turn the tensioner to see if the noise goes away... Turning counter-clockwise will turn out the tensioner , if it turns out and the noise goes away then you need a tensioner , if it won't turn out anymore (already at it's limit) then you need a new cam chain ..

I think she's going to blow!!!
 

How do you check valve clearance?

I think she's going to blow!!!
 

<div class="FTQUOTE"><begin quote>Originally posted by: HondaMechanic

Did you try taking the screw out of the center of the tensioner and using a small screwdriver turn the tensioner to see if the noise goes away... Turning counter-clockwise will turn out the tensioner , if it turns out and the noise goes away then you need a tensioner , if it won't turn out anymore (already at it's limit) then you need a new cam chain ..</end quote></div>

No... haven't tried that...

At the "tensioner lifter" on the outside of the engine?

I think she's going to blow!!!
 

<div class="FTQUOTE"><begin quote>Originally posted by: mudlicker

How do you check valve clearance?</end quote></div>

Are you asking as in what are the steps?

If so I can give you detailed instructions.
It's not hard... but would be a pain without step instructions.