WK400 owners thread.

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Scotriders
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Re: WK400 owners thread.

Post by Scotriders » Fri Aug 14, 2020 10:15 pm

Think the bikes running a bit rich. ImageImage

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EdwardCollings
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Re: WK400 owners thread.

Post by EdwardCollings » Fri Aug 14, 2020 10:53 pm

I was advised that air cooled engines run rich to help with cooling and once I removed the pair valve I would see a black exhaust as if it had a carb, I'm sure mine is similar.... Or it could be oil blow by from doing 82mph with a 42t rear sprocket like a proper mad lad!

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Re: WK400 owners thread.

Post by EdwardCollings » Fri Aug 14, 2020 10:55 pm

I'll pull my insert out tomorrow and compare

Andi_Archer
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Re: WK400 owners thread.

Post by Andi_Archer » Fri Aug 14, 2020 11:09 pm

On private land obviously Edward :lol:

EdwardCollings
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Re: WK400 owners thread.

Post by EdwardCollings » Fri Aug 14, 2020 11:21 pm

Ofcourse!

Markus
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Re: WK400 owners thread.

Post by Markus » Sat Aug 15, 2020 6:42 pm

my solution is a seat screw that can be opened with a coin anywhere anytime:
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Scotriders
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Re: WK400 owners thread.

Post by Scotriders » Tue Aug 18, 2020 6:39 pm

So I had my tank off to replace my clutch cable as the bottom nipple sheared off
While it was sitting on my garage floor it left a rather large puddle of unleaded . I would have thought once disconnected it shouldn't leak as there will be a vacuum type valve in there.
If there is indeed a dodgy vacuum valve in the fuel pump could this be adding to my fueling problems?
While the tank was off I drilled out the two wee breather holes to 3mm which allowed me to leave the brass cup and bearing in place. Today I was revving the bike well into the top end of the range without any cutting out so fingers crossed that's one problem sorted. It did cut out a number of times while pulling up to junctions though

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Re: WK400 owners thread.

Post by EdwardCollings » Wed Aug 19, 2020 5:01 pm

Hello Ned

Apologies I've been meaning to post a photo of my exhaust insert which is on its way to becoming quite black, I've only had the insert in for a few rides and initially mine was running to lean or at least I believe it was.

I too suffered with cutting out pulling up to junctions and I think raising the tickover helped, I've got a spare grub screw if you want it?

As for the pool of unleaded mine does that too, if I don't plug the end of the outlet it just leaks fuel.

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Re: WK400 owners thread.

Post by EdwardCollings » Wed Aug 19, 2020 5:05 pm

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Scotriders
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Re: WK400 owners thread.

Post by Scotriders » Wed Aug 19, 2020 6:32 pm


EdwardCollings wrote: I too suffered with cutting out pulling up to junctions and I think raising the tickover helped, I've got a spare grub screw if you want it?
I'll try that and thanks for the offer but I've probably got something kicking about the garage I can use.
EdwardCollings wrote: As for the pool of unleaded mine does that too, if I don't plug the end of the outlet it just leaks fuel.
Good to know it's not just my bike does it, does make me wonder if it's a common fault and could be partially affecting the fueling, causing the stalls at slow speed Image


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