Gen3 motor failure 300 miles on 1/4 mile

[mark3evo]

engine threw a valve keeper/collet max revs 140 mph  - no compression on 1 cylinder

dealer would not warrant as exhaust change and they know he rides bikes to race

not catastrophic 

 

[JOHN-DYNOSTAR]

sorry after 2 minutes of listening.

If he or any of his family "hit" the rev limiter . the engine would definitely be "toast" 

by the time they shut the throttle 

fast reactions NOT 

probably has really good 60' times at the drag race 

edit 

watched the vid and had to laugh at "factory defect" 

[mark3evo]

2 hours ago, JOHN-DYNOSTAR said:

sorry after 2 minutes of listening.

If he or any of his family "hit" the rev limiter . the engine would definitely be "toast" 

by the time they shut the throttle 

fast reactions NOT 

probably has really good 60' times at the drag race 

edit 

watched the vid and had to laugh at "factory defect" 

Lucky I set mine lower then

[JOHN-DYNOSTAR]

that motor has been on valve bounce for a long time  for the collets to come out .

love to see the tops of all the other valve retainers

[Kzin]

1 hour ago, JOHN-DYNOSTAR said:

that motor has been on valve bounce for a long time  for the collets to come out .

love to see the tops of all the other valve retainers

[MikaS]

3 hours ago, JOHN-DYNOSTAR said:

that motor has been on valve bounce for a long time  for the collets to come out .

love to see the tops of all the other valve retainers

What do you think, why it was only the 1st cylinder ?

It was quite hard listening to him explain, but i wanted to see the Gen3 valves and head.

Valve cover was so tight, was there one screw still in place (?)

 

[MikaS]

 

It was shimmed wrong

 

[mark3evo]

41 minutes ago, MikaS said:

 

It was shimmed wrong

 

i must admit i have taken my old engine to the rev limiter loads of times

[MikaS]

It is very usual there are shims around 2.80 thickness, as stock.

If there was 2.58 and it should be 2.78 , there is 0.45mm clearance on cyl1 exhaust valves, too much loose on top of valve.

I just wonder if there was ticking sound and he missed it.

 

 

edit: numbers corrected

[Kzin]

3 hours ago, mark3evo said:

i must admit i have taken my old engine to the rev limiter loads of times

Not at 300 miles you haven't....