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June 8th, 2004, 03:47 AM   #1
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Valve Tuliping

Hello,

I came round to adjusting the clearances on my 2002 650SM, one of the valves was tight. Only one of the exhaust valves. I can't remember whether this has happened before. The engine has only done about 70 hours.

Is it normal for valves to go, as a percentage how many Berg's have this problem ?

I am worried its Tuliping. I've read the info.

I ran the 53 cam up to 60 hours then changed to a GW G3 cam.

Should I just keep an eye on it ?

Please recommend.

Lloyd
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June 8th, 2004, 05:10 AM   #2
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i had the 'tuliping' and the first thing to say is that the exhausts were perfect whilst it was the inlets that were knackered.

my tappets needed loosening every time and i checked them every second ride. so i wouldn't panic after one check. not yet. i've never counted hours so....

i only know of scoot ('02 470) and me that have had this. i'm told it'ss from prolonged over revving buit i disagree, i have had tall gearing and make my bike lug.

Taffy
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June 8th, 2004, 07:27 AM   #3
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Gentlemen, at the risk of being redundant:

Due to high valvetrain velocities (High rpm coupled with rapid camshaft flanks), increased weight and less suitable material of the inlet valves said inlet valves are indeed subject to recession.

What to do:
Accept this fact and simply replace valves as required or reduce maximum rpm, install more suitable inlet valves and / or change camshaft profiles.

Note:
In addition the inlet follower axles wear quicker than that of the exhaust as a result of the higher valve weight.

Kind Regards,
Dale
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June 8th, 2004, 12:22 PM   #4
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dale

i don't see a discrepancy in my comment with anything you've said. i agree with you. some folk think that you have to overrev them for this condition to occur. i don't think i did and you say more or less the same thing. i certainly used the revs when i needed too.

high revs - overrevving

Taffy
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June 8th, 2004, 01:43 PM   #5
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Hi Taffy,
No offense taken. I was merely apologizing in advance as I have beat the valve velocity drum so often that I am quite certain their are those who are tired of hearing it.

Best Regards,
Dale
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June 8th, 2004, 03:25 PM   #6
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Taffy,
Not sure how you came to the conclusion that only Scoot and yourself have had the problem.

I have started a couple of threads on the problem, sorry for making you repeat yourself Dale.
I suggested you remove your head and check the valves while you were doing the cam chain as my valves have been replaced twice. I know I have seen a few other guys write about the same problem.

From what I have read most guys find that the valves have recessed while they have the head off for some other reason. I would expect that the valves should be checked every 5-7,000 km and you could be fairly confident they will need replacing.

I also agree that the valves will recess even without over reving.

Some guys suggest using products such as Motorex Valve Guard in the fuel to reduce the problem. These products are designed to reduce valve seat wear and don't claim to reduce recession.

I guess the other option would be stainless steel valves.
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June 8th, 2004, 04:06 PM   #7
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twist

didn't attack the husey vaults of info to get you, sorry about that. i remember simply that scoot made me decide to have a looksee. on the other hand i often think i'm paying attention when infact i'm not!!!!!

should have seen my grades

for me as a racer i would say the inlets are only good for one season of hard racing (three races and practice per month and 9 months) or two seasons of more leisurely chasing. as said, i don't measure the miles and neither probably does anyone else who is on their third speedo!

Taffy
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June 9th, 2004, 03:35 AM   #8
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Has anyone considered the fueling in the event of the valve tuliping ?

Sorry if this has been discussed before, I have not checked..

I was thinking that an excessively lean mixture could cause high combustion temperatures and like in the case of blowing a hole in the piston, weakening the valves. Very hot valves would have lower yielding stresses than cooler valves. This combine with the already close to yeilding working stresses would push the valves over the point of deforming.

I am just theorising

Lloyd
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June 11th, 2004, 12:43 AM   #9
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Hi all!

Who makes similar valves for husaberg?







Makke
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June 11th, 2004, 01:19 AM   #10
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in the uk my dealer has Ti valves and another supplier of one-piece racing valves would be 'racing valve components' from birmingham.

Taffy
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