Reversing the Carnage

[FORMA MOTO]

After riding my 2008 WR450F with no water for 25 miles, there was a little bit of damage: cam, cam journals were toast......so a new head is being ported and polished as we speak, along with oversize radiators, 13:1 Piston, and all the necessary bits to restore it all...

 

 

 

....but to my surprise, AS Racing was able to polish out the cam, and it even plasti-guaged well within specs!

 

 

 

...so that's very good news.

 

[grayracer513]

The last Yamaha 450 I did that temporarily ended its career by running out of coolant did no damage at all to the cams or any other part of the oil system except the cylinder and piston.  It did, however, almost loose the exhaust valve seats, or even worse.  It got so hot that you could see where the metal between the exhaust seats had "just" started to melt.   Both seats were warped into ovals, but not so far they couldn't be cut.  Close call.

 

The factory fits the cams so tight that they can usually be polished quite a bit before they get loose enough to be out of spec.  Yours didn't look so bad compared to others.

[mebgardner]

Would someone please give a few sentences to describe what I'm looking at in the plasti-gauge pictures above?

 

I see the marks from the ink left behind, but I dont know how to "read" it...

 

Thanks.

[bg10459]

The two white ovals in the 2nd to last pic have been squished to a certain width. Compare that width to the chart to determine the clearance. If they weren't squished as wide it would be greater clearance. If they were squished wider it would be less clearance.

[67imp]

man I knew Cali was in a drought condition but to take it out on the WR .... that is just sick!

[FORMA MOTO]

Freshly ported and polished head 

 

[FORMA MOTO]

You can see in the first pic, on the far left, the overheated exahust valve springs/keepers.....totally roached from heat....

Edited May 21, 2014 by TheKoolAidMadeMeSick

[FORMA MOTO]

Done!

 

New Head

Stage 3 Port and polish

JE 13:1 piston

OS radiators

..waiting for Mohard rad cages....

 

New graphics are on the way......

[KennyMc]

Done!

 

New Head

Stage 3 Port and polish

JE 13:1 piston

OS radiators

..waiting for Mohard rad cages....

 

New graphics are on the way......

The right graphics

?

Edited May 23, 2014 by KennyMc

[FORMA MOTO]

You will like mine, Ken. 

Almost exactly like yours, but not.

Too bad I ordered the wrong ones......DOH..

[KennyMc]

You will like mine, Ken. 

Almost exactly like yours, but not.

Too bad I ordered the wrong ones......DOH..

So you did order the WR ones?  Did you get that straightened out?

[FORMA MOTO]

I got the YZ shrouds with graphics on the way.

 

How this for UGLY?

 

My intermediate graphics.... using what ever I had...

 

[FORMA MOTO]

Well crap.

 

It didn't  'take'

 

The motor is clattering all over the place

 

Back to the shop

[KennyMc]

No testy testy at AS before bringing it home or did you put it back together?

[FORMA MOTO]

It ran fine, accept for the jetting being way off again...but I know why that is...

Started to get noisy at about mile 30

Sounds like a really loose valve train

[KennyMc]

accept for the jetting being way off again...but I know why that is...

 

Tried and true....tried and true ?

[peaceofwork]

crappy krannie but once in a while shit happens to the best of us , I'm thinking I'm going to get that old girl who answers the phone their to do my next one she sounds really smart.

[FORMA MOTO]

Well, it appears to be only a cam chain tensioner failure at this point.

 

Whew

[peaceofwork]

that's got to be a relief to find out, its no big deal at all

[FORMA MOTO]

...don't jinx it....