Popping & Banging on the Overrun

Black Panther/Street Moto, Baghira, Enduro, Mastiff, Skorpion Traveller and Tour.

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Re: Popping & Banging on the Overrun

Postby dandywarhol » Sat Jul 23, 2016 5:48 pm

Check item number 46, diaphragm, isn't perished with ethanol/age. It's an anti popping valve :D

https://www.motorcyclespareparts.eu/yam ... 43944.aspx
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Re: Popping & Banging on the Overrun

Postby DAVID THOMPSON » Sat Jul 23, 2016 9:24 pm

posted this in case link goes dead

click to make it bigger
Attachments
carb item 46.jpg
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Re: Popping & Banging on the Overrun

Postby starfield181 » Sun Jul 24, 2016 4:58 am

I wound the pilot adjuster screw out. Probably about 4 turns in total now and the popping & banging was much reduced. The tickover also speeded up a bit so. I will try another 1/2 turn out to see if it continues to improve.

Interesting concept of an anti popping valve. Wonder how its supposed to work. Looks as though you have to buy the whole assembly rather than just the diaphragm. Think I will continue with adjustments for the moment. Bike is certainly much better now.

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Re: Popping & Banging on the Overrun

Postby billr » Sun Jul 31, 2016 6:04 pm

EDFManiac wrote: "The Mikuni VM28/486 #40 pilot jet works. It doesn't look like the stock jet but it functions just fine and is available at almost any place that carries Mikuni jets."
I took that advice and changed mine out. No more popping and I'm at 3 turns out.
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Re: Popping & Banging on the Overrun

Postby breakwellmz » Tue Aug 02, 2016 4:08 am

I see the biggest size these (UK) suppliers keep is a 37.5, what size is the standard jet?

http://www.ebay.co.uk/itm/142044406653? ... EBIDX%3AIT
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Re: Popping & Banging on the Overrun

Postby Nabsteel » Tue Aug 02, 2016 3:50 pm

Have a look at my thread 'Does this spark plug look ok?'

I bought a Baghira a while back and it was backfiring on the over run badly. I turned the mixer screw out as much as i dare, which helped but didn't completely solve the problem. It was running lean, but wasn't completely sure, so put it on the rolling road and paid £80 in total to get it re jetted correctly and now it runs great and pulls better to boot!

viewtopic.php?f=3&t=8340
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Re: Popping & Banging on the Overrun

Postby edfmaniac » Tue Aug 02, 2016 5:34 pm

breakwellmz wrote:I see the biggest size these (UK) suppliers keep is a 37.5, what size is the standard jet?

http://www.ebay.co.uk/itm/142044406653? ... EBIDX%3AIT



There's no way of telling what the stock Mikuni equivalent would be because they flow differently than a Tekei jet. But my bike was just slightly rich with the #40. A #37.5 might be right on the money.
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Re: Popping & Banging on the Overrun

Postby edfmaniac » Tue Aug 02, 2016 5:40 pm

01 Skorpion Traveler 660
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Re: Popping & Banging on the Overrun

Postby breakwellmz » Mon Aug 08, 2016 3:39 pm

edfmaniac wrote:
breakwellmz wrote:I see the biggest size these (UK) suppliers keep is a 37.5, what size is the standard jet?

http://www.ebay.co.uk/itm/142044406653? ... EBIDX%3AIT



There's no way of telling what the stock Mikuni equivalent would be because they flow differently than a Tekei jet. But my bike was just slightly rich with the #40. A #37.5 might be right on the money.


I got one from these people it turned up today, you can`t go wrong at that price but it`s gone up already!

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... _500wt_969
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Re: Popping & Banging on the Overrun

Postby Henry74 » Tue Nov 29, 2016 7:16 am

Hi, you are mentioning nbr 37.5 and nbr 40 Mikuni Pilot jets. But what do these numbers stand for ? the jet hole measurements maybe eg .40 mm ?
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Re: Popping & Banging on the Overrun

Postby dandywarhol » Tue Nov 29, 2016 10:31 am

Henry74 wrote:Hi, you are mentioning nbr 37.5 and nbr 40 Mikuni Pilot jets. But what do these numbers stand for ? the jet hole measurements maybe eg .40 mm ?


Mikuni numbers indicate flow rate in cc/minute
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