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PostPosted: Sat Sep 15, 2018 3:34 am 
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On the street

Joined: Mon Jun 11, 2018 11:11 am
Posts: 12
Country: finland
Bikes owned: suzuki gt250
i have changed spark plugs and cap but it still doesnt run both cylinders??

if i put plug "loose" to the plug it runs on 2 cylinders but if you push plug down cylinder dies. battery has been charged and points adjusted.

could it be bad coil?


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PostPosted: Sun Sep 16, 2018 7:27 am 
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On the street

Joined: Mon May 16, 2011 8:33 am
Posts: 48
Thats almost allways a spark plug problem


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PostPosted: Sun Sep 16, 2018 9:11 am 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3276
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
Did you trim off around 1/4” of the HT lead before attaching the new spark plug cap?
If you didn’t, you may have an iffy connection that could be affected when you push down on the cap.

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BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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PostPosted: Sun Sep 16, 2018 10:07 pm 
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Around the block

Joined: Tue Jul 03, 2018 4:32 pm
Posts: 78
Country: Usa
Bikes owned: '74 GT250
Ya that surely sounds like a bad spark plug cap. Something in the cap is losing connection when you push down on it. I had one of those caps with the metal shrouding on the outside(for looks I guess) and it was grounding out on the metal part of the plug thus no spark at the electrode. Best option is buy a new cap or better yet buy two they are cheap and should be replaced every few years anyway.


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