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1986 vt1100 rear cylinder sparking issue

So i have spark to all four plugs when cranking the motor over the bike starts fine then the rear cylinder quits firing after 2 seconds that cylinder stops firing. but as soon as i hit the start button it starts that cylinder right back up again and 2seconds later its off plzz help if any ideas

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  • Honda Master
  • 1,727 Answers

You have 12 volts going to the coils... use a test light to see if this power drops out... then you need to find out why... if it doesn't drop out then I would be looking at the pickup coil because this triggers the coil to spark... if this isn't the issue, suspect a bad coil

Posted on Dec 28, 2013

Testimonial: "just ordered new pick up coils cuz i tried switching coils last weekend and same issue and there is no power drop and the rear cylinder spark is a lot weaker than the front cylinder spark so this is a good asumption we will see as soon as i get my pickup coils from ebay thanks for the advice we will see in a few days what happens fingers crossed thanks again"

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Posted on Jan 02, 2017

  • 3567 Answers

SOURCE: bike only fires once

Okay, let's have a look at it. Say Ahaaa.
The probable cause of the problem is not the spark. Get a fresh set of Stock NGK spark plugs, ground the plus to the engine, and check each cylinder for spark as the starter button is pressed for 3 seconds or so. I will wager that the spark is present.

The likely problem is the fresh gas was put into a very rusty gas tank. Bits of rust now inhabit your carb and are having fun plugging up the carb. Look at the gas valve. With a little luck there is a small bowl behind the valve. Remove it and tell me what you see in the bowl.

Posted on Apr 11, 2009

  • 2712 Answers

SOURCE: cylinder issue

Well I figured it out. The carbs were rejetted at some point by a previous owner and the bike was running richer than normal. I recently did a tune up on the bike and put in new OEM spark plugs. The oem plugs were getting fouled. I put the old plugs back in which are a step hotter than oem and the bike ran again. Im just relieved it wasnt anything major. Thanks for the advice.

Posted on Nov 20, 2008

  • 101 Answers

SOURCE: 04 sportster 883 will turn over and back fire but will not start

Sounds like it jumped time.. Check your timing ..

Posted on Jan 24, 2009

  • 3 Answers

SOURCE: NO SPARK

most likely you have a CDI box failure. the easiest way to find out tho is take it to a dealer and have them run a diagnostic test, usually around 60$ find out whats wrong and depending on the problem have them fix it or tackle the issue yourself.

Posted on May 12, 2009

wayneman01
  • 301 Answers

SOURCE: honda 1986 vf400f nc13 engine front two cylingers not firing help

If the spark appears to be weak only for the two front cylinders, then I would suggest checking the electrical connections for the ignition coils.
If the spark for the other two cylinders looks the same (yellow), then I'd suggest checking the compression on the non-functioning cylinders. A compression reading of 140~160PSI is what you're looking for. Low compression indicates internal engine damage - or could be from something relatively simple - like insufficient valve tappet clearance.

If the bike has been sitting for a long period of time, it could be that the carburetors are plugged up with fuel varnish. This can cause some cylinders to not run. A complete carb disassembly and clean-out will be needed.

Posted on Oct 23, 2009

Testimonial: "thanks for that feed back . there is plenty of fuel and compression is non existant on front left and 80 psi on front right,I suspect cam wear????"

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