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#Post#: 12685--------------------------------------------------
Valve clearances
By: DavidandCarolynne Date: February 18, 2025, 8:14 am
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Hi all,
We have a lifan engine from which we have removed the governor
mechanism. In the process we disturbed the camshaft and
lifters. We reinstalled the camshaft, lining up the timing
marks and had to drop the pushrods in from the top, meaning we
had to reset the valve clearances.
We've set them to 8 and 10 thou, which seemed to be the
recommended gaps.
My concern is the the rockers feel very sloppy at TDC with those
settings. Is that normal?
#Post#: 12686--------------------------------------------------
Re: Valve clearances
By: christopher kaminski Date: February 18, 2025, 11:38 am
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Hi, not sure about the lifan but honda GX 200 set to .006 & .008
inch so you maybe a couple thou loose on both
#Post#: 12687--------------------------------------------------
Re: Valve clearances
By: DavidandCarolynne Date: February 18, 2025, 11:56 am
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Thank you.
#Post#: 12688--------------------------------------------------
Re: Valve clearances
By: NewbieNick Date: February 18, 2025, 12:07 pm
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Hi, I have a lifan in the Marmon Wasp, the valves clearances you
have used are correct for that engine. That will tighten up
quite a lot as the engine comes up to temperature.
Have you upgraded the springs to 18lbs ?
Cheers Nick
#Post#: 12689--------------------------------------------------
Re: Valve clearances
By: DavidandCarolynne Date: February 18, 2025, 1:01 pm
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No, we've left the springs as-is for now. We've added a decent
exhaust and a Mikuni clone carb.
We're trying to resist the temptation to go for loads of power
as we've both been involved in properly powerful racing kit in
the past and the cyclekart is meant to be a light-hearted break
from that.
#Post#: 12690--------------------------------------------------
Re: Valve clearances
By: NewbieNick Date: February 19, 2025, 12:12 am
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Hi,fully understand what you’re saying about the power. But I
think that with the governor removed & a mikuni carb you will
have much higher revs than the weak springs can cope with.
Resulting in valve float.
Cheers Nick
#Post#: 12691--------------------------------------------------
Re: Valve clearances
By: Jimr1999 Date: February 19, 2025, 3:28 am
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For the sake of a few quid and the peace of mind the up-rated
springs give you, I would be in agreement with Nick. I have
bought from kart suppliers "18lb" springs and also used the link
below that does not give a rating but classes them as "heavy
duty" - and when bought - they are identical to the "18lb"
springs even to the packaging.
HTML https://www.ebay.co.uk/itm/323822196039
JimR
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