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Hi I have an origami b1 replica mini moto and I can't get it started, when trying to start it backfires once the pressure has built up, I have stripped it all apart and checked everything, fitted new spark plug new gaskets all round, cleaned the carb but still the same, please help???

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6ya6ya
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Posted on Jan 02, 2017

ollie reece
  • 1167 Answers

SOURCE: I have a 2004 Husqvarna SMR450 always been very

you have too much fuel going into to cylinder if backfiring on carb there are 2 screws one for idle and one for mixture the mixture screw is the one you want turn this in 1/2 off turns or more if doesnt help this picture will help buddye738b4f.jpg

Posted on Sep 08, 2009

kel1guy2002
  • 3740 Answers

SOURCE: fzr 600 got killer spark pulls fuel valves in

This is not the news you probably want to hear but backfiring thru the carbs when you have good spark can be one of 2 things... either the valves are sticking / not closing properly due to carbon or the cam timing has shifted from the original position.

It would be best to do a compression test. You should have a minimum of 100 PSIG for an engine with major problems and up to 150 for a healthy engine. If you can not get 100 PSIG then it will be time for some serious engine service.

There is a possibility of the kill switch wire in the handle bar grip grounding under the grip to the handlebar but, since you said you have killer spark I doubt this is your problem.

Thanks for using FixYa.

Kelly

Posted on Jun 10, 2010

Testimonial: "hey thanks for your help when i get stuck this is the first place i look for answers thanks again"

  • 339 Answers

SOURCE: hi got a suzuki gs750 not ran for a number of

when you say a number of years is it the same petrol in the fuel tank?

personnely i would look at the filter in the fuel tank is it clean when you turn on the petrol does it run freely? disconnect the fuel pipe and empty the tank into a fuel can

i know you said that you have cleaned the carb but did you check the floats? a messy job which will cover your hands in petrol but must be done im afraid

give me shout if when you have done this and maybe i can help some more

John

Posted on Feb 21, 2011

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