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xs650 > > Motorcycle Systems > > Fuel > > Fouled plug and jets question


Fouled plug and jets question
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randreas
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Joined: Oct 02, 2009
Posts: 5

PostPosted: October 23, 2009, 4:26 pm    Post subject: Fouled plug and jets question

I just got a 650 and have a problem with the left plug getting fouled. The PO had 30 pilot jets in the carbs (Mikuni 34s) so I changed them to 25s. The right side seems to be Ok (tan plug color) but the left is still getting black and I have the air screw out over 2 turns already.

Would it be OK to put a 20 pilot jet in the left carb and leave the right with the 25?

Thanks for any help.. I'm a newbie with these bikes.
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weekendrider
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Joined: Apr 20, 2007
Posts: 1284
Location: SW MO 2x83SK 79F 78E

PostPosted: October 24, 2009, 2:11 am    Post subject: Re: Fouled plug and jets question

The stock 34's had a 42.5 pj.
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yamaman
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Joined: Jan 04, 2007
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Location: Perth Western Australia

PostPosted: October 24, 2009, 4:19 am    Post subject: Re: Fouled plug and jets question

You talking about stock BS34's, 1980 on?
Or you talking VM34's aftermarket round slides?
Or simpler terms, are the tops of the carbs held on with 4 screws (BS 34's) Or does the top screw into the carb body (VM's)
Cheers

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jayel
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Joined: Apr 16, 2006
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Location: SE Iowa 1974 TX650A

PostPosted: October 24, 2009, 9:17 am    Post subject: Re: Fouled plug and jets question

what is the compression readings on both cylinders? what # plugs are you running?
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randreas
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Joined: Oct 02, 2009
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PostPosted: October 27, 2009, 3:56 pm    Post subject: Re: Fouled plug and jets question

Sorry, they are the aftermarket Mikuni VM Roundslides. Not sure about the plugs and compression, will check when I get home.
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yamaman
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PostPosted: October 27, 2009, 4:00 pm    Post subject: Re: Fouled plug and jets question

650rider.com/index.php...pic&t=8504

Plenty in there to give your mind a workout! lol

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randreas
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PostPosted: December 25, 2009, 4:29 pm    Post subject: Re: Fouled plug and jets question

Well, I'm an idiot...

Turns out I was riding around with the choke on on the left side. Yes, it took me this long to notice that pushing the choke lever down on the left carb did the opposite of pushing the plunger down on the right one.

Embarassed
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yamaman
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Location: Perth Western Australia

PostPosted: December 25, 2009, 6:20 pm    Post subject: Re: Fouled plug and jets question

Cool, thanks for being honest.............Must run a bit better now then?
y bike vibrates the choke off almost as soon as it starts, has tricked me once or twice by staying on!

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randreas
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PostPosted: December 25, 2009, 8:42 pm    Post subject: Re: Fouled plug and jets question

Yeah, took it for spin and it ran well. Haven't dialed it all the way in yet. Seems to stumble a bit when taking off.
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