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Author Topic: cr480 wont start  (Read 4756 times)

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Offline caps 999

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cr480 wont start
« on: February 07, 2009, 09:59:34 pm »
gday all having a bit of 480 troubble ran fine yesterday now today there is no life carby gets fuel theres spark and a new plug but after 300 kicks it still looks like a new plug it seems like fuels isnt making it to the plug could a leaking head gaset cause this at all or could it be something else its got me stuffed any suggestions  ???
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hotdog1975

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Re: cr480 wont start
« Reply #1 on: February 07, 2009, 10:05:45 pm »
did'nt leave the rag in the airbox................. ???
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Offline caps 999

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Re: cr480 wont start
« Reply #2 on: February 07, 2009, 10:10:22 pm »
haha nope but i changed the main jet to a 175 from 178 though
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Offline E74

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Re: cr480 wont start
« Reply #3 on: February 07, 2009, 10:20:07 pm »
jets are blocked
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Offline caps 999

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Re: cr480 wont start
« Reply #4 on: February 07, 2009, 10:35:13 pm »
ive checked that still nuffing
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Offline oldyzman

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Re: cr480 wont start
« Reply #5 on: February 07, 2009, 10:40:21 pm »
How about if you prime the bore with a capfull of fuel and then kick it..
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Offline caps 999

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Re: cr480 wont start
« Reply #6 on: February 07, 2009, 10:42:45 pm »
done that im baffled
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Offline LWC82PE

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Re: cr480 wont start
« Reply #7 on: February 07, 2009, 10:56:30 pm »
if its not firing with fuel or instant starting fluid down the plug hole you might have a timing issue. any chances the timing as slipped/moved?
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hotdog1975

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Re: cr480 wont start
« Reply #8 on: February 07, 2009, 11:06:43 pm »
not a faulty "new" plug...?? try the old plug again.
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Offline VMX247

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Re: cr480 wont start
« Reply #9 on: February 07, 2009, 11:08:48 pm »
fuel cap breather blocked . 8)
I don't know who first put this idea up ,but I've pinched it and have used it ever since  :-\
I think it was oldtimer or oldyz or someone old   ;D  8)  
anyway hope it runs well with the next effort or tomorrow. :)
cheers Alison
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Offline caps 999

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Re: cr480 wont start
« Reply #10 on: February 07, 2009, 11:11:39 pm »
tried 3 differnt plugs ignition is fine is it possible to get vaper lock on this model cause im stuffed
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hotdog1975

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Re: cr480 wont start
« Reply #11 on: February 07, 2009, 11:16:27 pm »
sheared woodruff key..??
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Offline caps 999

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Re: cr480 wont start
« Reply #12 on: February 07, 2009, 11:29:00 pm »
ignition timing is fine it seems like no fuel is making it to the ignition stroke
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Offline jimg1au

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Re: cr480 wont start
« Reply #13 on: February 07, 2009, 11:46:39 pm »
if you put fuel down the plug hole or areostart and it dosnt fire it the problem IS IGNITION as you have fuel there but no ignition.i had the same problem with my 1973 cr250m the ignition coil was new but faulty.just sit back and think. you have spark.you have put fuel in cylinder via the plug hole and still not firing it is ignition.
cheers
jim
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090

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Re: cr480 wont start
« Reply #14 on: February 08, 2009, 08:16:47 am »
Also , if it was running fine before you changed the jets over, there is a good chance it is in the carby. Make sure the slide is in properly and cable hasn't been pulled out of the top of the carby. A bike is impossible to start if the throttle is stuck half way.
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