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Stella engine racing after spark plug change

 
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RoaringTodd
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Joined: 23 Jul 2012
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Location: Philly, PA
'04 Stella GB150 '15 Roughhouse '17 Versys 650.

PostPosted: Wed Dec 23, 2015 1:16 pm    Post subject: Stella engine racing after spark plug change Reply with quote

Last week my 2t Stella wouldn't start. She ran perfectly before that. I tested for spark, found none, so changed the spark plug. Gapped to .7 as per the manual. Same kind of spark plug as the previous one.

Now the engine races after riding around the block. I thought the spark plug wasn't in snug enough causing an air leak. Checked that with choke cleaner and removed and reinserted the plug. Engine still raced.

What gives? What in a spark plug change would cause the engine to race?

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avescoots1134
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Joined: 06 Oct 2014
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PostPosted: Wed Dec 23, 2015 3:00 pm    Post subject: Reply with quote

Pull the airbox lid and filter and make sure everything is closing correctly. Then you can check your jets if that isn't the case. Then go chasing air-leaks
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RoaringTodd
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Joined: 23 Jul 2012
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Location: Philly, PA
'04 Stella GB150 '15 Roughhouse '17 Versys 650.

PostPosted: Mon Mar 14, 2016 6:44 pm    Post subject: Reply with quote

Update - it was the carburetor. Had my dealer take a look and he cleaned up the carburetor and worked his secret magic. I've never had her run this well before. What I thought was normal "Stella ya know" was not it. It's like a whole new scoot.
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RoaringTodd
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Location: Philly, PA
'04 Stella GB150 '15 Roughhouse '17 Versys 650.

PostPosted: Tue Mar 15, 2016 10:44 am    Post subject: Reply with quote

Forgot to add - the head was leaking a little bit. He machined the head smooth and put on a new gasket and torqued down everything tight.
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fisher1
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Joined: 08 Sep 2012
Posts: 188
Location: Pa

PostPosted: Wed Mar 16, 2016 12:58 am    Post subject: Reply with quote

Wondering ..... what plug did they install / were you using? The Phila shop put a NGK B6ES in mine many years ago when I had it in for the 500 mi. warranty checkup. That's good for center city, but I'm in the 'burbs where I do a lot more sustained running and it showed up as increased temps on the CHT. So I swapped it out for a cooler B7ES which settled it back down to normal temps. Just FYI.
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RoaringTodd
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Joined: 23 Jul 2012
Posts: 682
Location: Philly, PA
'04 Stella GB150 '15 Roughhouse '17 Versys 650.

PostPosted: Tue Mar 22, 2016 11:40 am    Post subject: Reply with quote

Yeah it's the B7ES.

However have been having problems with plugs fouling after only a few hours on the plug. We're talking wet black oil covered plugs. :facepalm:

Stellas. Gotta love them.

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az_slynch
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Location: Tucson, AZ
'18 Spade, '16 K-Pipe, '13 Stella 4T, '12 Yager GT200i, '81 Vespa P200e and Far Too Many Others

PostPosted: Tue Mar 22, 2016 9:38 pm    Post subject: Reply with quote

RoaringTodd wrote:
Yeah it's the B7ES.

However have been having problems with plugs fouling after only a few hours on the plug. We're talking wet black oil covered plugs. :facepalm:

Stellas. Gotta love them.


Still running the autolube? Does she seem to smoke a lot at idle? If so, you might have the pump disassembled and replace the O-rings that go on the pump's valve body. Besides that, your mixture might need to be leaned out a touch with your air leak fixed.

If you're premixing, what's your ratio, what's your jetting and what your mix screw set at?

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