Author Topic: forks topping out  (Read 442 times)

Offline maurice turner

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forks topping out
« on: September 27, 2020, 10:32 »
One of my marzocchi suspension Laverdas has started front fork topping I am wondering if I caused the problem by making a longer pre load spacer on top of the spring????
What actually stops the topping oil flow back through that primative valve, that short spring in the damper assembly?????
Can someone give me some guidance here?
81 Jota*7604*

Offline CLEMTOG

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Re: forks topping out
« Reply #1 on: September 27, 2020, 10:58 »
take the spacers out and see what happens, you are probably already on it, the extra pre load on the spring is probably causing too quick an extension.
CLEM

Offline AndyW

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Re: forks topping out
« Reply #2 on: September 27, 2020, 12:20 »
I had that problem with my mirage a few years back: cut the preload spacers in half to achieve about 35-40mm of Static sag and All was well once more..
'71 TR6 Tiger, '73 X-75, '73 3C, '74 3C, '75 SF2, '75 850T3 Cal, '75 T160V, '78 Mirage, 78 SSD Darmah '80 SD Darmah, '82 TR7/T, '83 Tenere, '85 R80g/s, 2017 MV F3 800 (Ago edition)

Offline Dave "SPIDER" Holder

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Re: forks topping out
« Reply #3 on: September 28, 2020, 10:25 »
Didn't that make it sit lower at the front and make it a bitch to get on the center stand?
1982 SERIES 2 TS MIRAGE 3557, 1999 ZANE 750S.
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Offline Piranha Brother 2

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Re: forks topping out
« Reply #4 on: September 28, 2020, 15:14 »
Isn't topping out an indication of insufficient rebound damping at near full extension? Would higher fork oil level alleviate it? Or heavier fork oil?
What ... leave it standard??!!

Offline Haggis

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Re: forks topping out
« Reply #5 on: September 28, 2020, 15:20 »
Or the rebound springs have sacked out and are now more or less solid - giving a harsh top-out. Unlikely but possible.
History, eh! It's just one bloody thing after another.

Offline Tippie

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Re: forks topping out
« Reply #6 on: September 28, 2020, 15:33 »
More preload shouldn't affect it Time for a look inside.
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Online hooksey

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Re: forks topping out
« Reply #7 on: September 28, 2020, 22:19 »
Probably Had a  damper rod piston nip up, and the whole caboodle has come adrift!

Time to pull em for a look see ;)

Offline Legs

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Re: forks topping out
« Reply #8 on: September 28, 2020, 22:58 »
Quote
I am wondering if I caused the problem by making a longer pre load spacer on top of the spring?
Think you have answered your own question Maurice.
Check your static sag; about one quarter of total travel unloaded and one third with rider.