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Thread: F3 675 / 800 Head Failure - There is hope! Reply to Thread
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  Topic Review (Newest First)
09-01-2019 04:01 PM
Black_Gold_Saw
Quote:
Originally Posted by PTsalas View Post

I could also just do nothing and keep riding it. Right now I'm not planning on upgrading anytime in the next 2-3 years so decisions decisions... I do 1000-2000 km per year and it's sitting on 12000km.
I woudnt look to much into changing it if I were you.
Costs top dollar and its not your priority now.
09-01-2019 03:46 PM
PTsalas So I plan to do the intake valve and cam update later this year.

So here's the crunch, MV are selling the intake kit (intake valves and cam shaft) at a really good price, but the exhaust valves and valve springs cost big $$$. The new valve springs cost more than the intake kit and same with the exhaust valves and they don't even include the cam.

My concern is that I've read of several people dropping exhaust valves. I'm worried I'll have it half baked only changing the intake thereby still exposing me to engine failure. My understanding was that the valve springs and or valve guides were causing the exhaust valves to fail?

The other worry is spending 2000 euro for the entire top end instead of the rather reasonable 450 for the intake kit only...

I could also just do nothing and keep riding it. Right now I'm not planning on upgrading anytime in the next 2-3 years so decisions decisions... I do 1000-2000 km per year and it's sitting on 12000km.
07-07-2019 02:23 PM
dudman
Quote:
Originally Posted by PTsalas View Post
Quote:
Originally Posted by dudman View Post
Correct, the original valve narrows for the last 15-20mm before the head, and the latest one does get fatter.

Also there is a stronger Ti alloy used, it's the same alloy that the exhaust valves are made of.
Have you managed to fit this kit yet John ? Keen to hear how it compares performance wise.
Unfortunately not, it was ment to happen couple of weeks ago but my recent crash destroyed the bike so all time and money has gone into repairs.
Looking like it won't happen until the end of the year at the moment 😢
07-07-2019 01:16 PM
PTsalas
Quote:
Originally Posted by dudman View Post
Correct, the original valve narrows for the last 15-20mm before the head, and the latest one does get fatter.

Also there is a stronger Ti alloy used, it's the same alloy that the exhaust valves are made of.
Have you managed to fit this kit yet John ? Keen to hear how it compares performance wise.
06-27-2019 03:57 AM
Dutch MV Looks like the newer style valve is heavier than the previous style.
Do the newer engines have a lower maximum rpm ?
05-26-2019 05:28 AM
dudman Correct, the original valve narrows for the last 15-20mm before the head, and the latest one does get fatter.

Also there is a stronger Ti alloy used, it's the same alloy that the exhaust valves are made of.
05-25-2019 01:39 PM
PTsalas Thanks. Is it just my eyes or is the stem fatter near the base where it cups out (referring to the 2019 valve)?
05-24-2019 04:37 PM
dudman
Quote:
Originally Posted by PTsalas View Post
Thanks for posting. Let us know how it runs and if you could also post pictures of the old intake valves next to the new ones. Curious to see what they changed (if there is anything visually different)
Old style on left, new on right
05-24-2019 02:44 PM
PTsalas Thanks for posting. Let us know how it runs and if you could also post pictures of the old intake valves next to the new ones. Curious to see what they changed (if there is anything visually different)
05-21-2019 01:09 PM
dudman
Quote:
Originally Posted by PTsalas View Post
Quote:
Originally Posted by dudman View Post
You beat me to it, was waiting for the parts and part number to arrive.

Will post pics of the kits next week when they arrive
Hi John, has your kit arrived yet?
Yes, apologies forgot to post the pics.
Right hand cam is the latest profile I can confirm a 0.3mm decrease in lift over the original and the part number has changed from F3R RA5 to F3R RA6 .
what you see in the last pic is the complete kit
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