Gas to carb still wont start

jwalsh965 · 07-01-2015, 02:35 PM

I have a 1984 yamaha 2 stroke that won't start. I have lots of compression and spark, fuel to the carb but don't seem like I am getting fuel to the cylinder because spark plug is always dry never fueled up. Carb has been cleaned lots of fuel coming from pump but the muffler has been fully wrapped with a second skin of metal over it. I have read that the muffler could cause trouble like I am having as I do get the odd time a small back fire from muffler. It seems the carb is not getting fuel sucked out and put in cylinder. Please help

Mr. Mike · 07-01-2015, 03:34 PM

Try pouring a little mixed fuel right into the head thru the spark plug hole, put the plug back in and see if it'll fire. That should tell you if it's a carb problem.

cgtech · 07-01-2015, 04:39 PM

Check for broken carb cable. Look at carb while pressing pedal, is throttle opening?

jwalsh965 · 07-01-2015, 05:21 PM

I have poured fuel in cylinder but still no go, wont even fire then. The spark is not a bright blue but more of a white spark, not enough to fire.

jwalsh965 · 07-01-2015, 05:23 PM

All the linkage is working fine even the choke and I have checked the exhaust valve near muffler. I think the spark is not enough to fire but there is spark, and I gapped the plug to 27" inch.

Mr. Mike · 07-02-2015, 07:14 AM

I don't know much about G1's...never had one but sounds like an igniter/coil problem? Have you performed a compression test just to make sure that you have enough compression?

jwalsh965 · 07-02-2015, 07:34 AM

Thats my next step compression test. Is there a way to check igniter coil because there is spark but not a blue spark like it should be.

jwalsh965 · 07-02-2015, 07:44 AM

compression check is next. is there a way I can check igniter / coil. Thanks for the help guys.

07-01-2015, 02:35 PM	#1
jwalsh965 Getting Wild Join Date: Jan 2013 Location: st. john's nl canada Posts: 139	Gas to carb still wont start I have a 1984 yamaha 2 stroke that won't start. I have lots of compression and spark, fuel to the carb but don't seem like I am getting fuel to the cylinder because spark plug is always dry never fueled up. Carb has been cleaned lots of fuel coming from pump but the muffler has been fully wrapped with a second skin of metal over it. I have read that the muffler could cause trouble like I am having as I do get the odd time a small back fire from muffler. It seems the carb is not getting fuel sucked out and put in cylinder. Please help

07-01-2015, 03:34 PM	#2
Mr. Mike It's Beer Time! Join Date: Sep 2010 Location: Vineland, NJ Posts: 1,462	Re: Gas to carb still wont start Try pouring a little mixed fuel right into the head thru the spark plug hole, put the plug back in and see if it'll fire. That should tell you if it's a carb problem.

07-01-2015, 04:39 PM	#3
cgtech Over This Interview Is... Join Date: Jun 2012 Location: AZ Posts: 17,449	Re: Gas to carb still wont start Check for broken carb cable. Look at carb while pressing pedal, is throttle opening?

07-01-2015, 05:21 PM	#4
jwalsh965 Getting Wild Join Date: Jan 2013 Location: st. john's nl canada Posts: 139	Re: Gas to carb still wont start I have poured fuel in cylinder but still no go, wont even fire then. The spark is not a bright blue but more of a white spark, not enough to fire.

07-01-2015, 05:23 PM	#5
jwalsh965 Getting Wild Join Date: Jan 2013 Location: st. john's nl canada Posts: 139	Re: Gas to carb still wont start All the linkage is working fine even the choke and I have checked the exhaust valve near muffler. I think the spark is not enough to fire but there is spark, and I gapped the plug to 27" inch.

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07-02-2015, 07:14 AM	#6
Mr. Mike It's Beer Time! Join Date: Sep 2010 Location: Vineland, NJ Posts: 1,462	Re: Gas to carb still wont start I don't know much about G1's...never had one but sounds like an igniter/coil problem? Have you performed a compression test just to make sure that you have enough compression?

07-02-2015, 07:34 AM	#7
jwalsh965 Getting Wild Join Date: Jan 2013 Location: st. john's nl canada Posts: 139	Re: Gas to carb still wont start Thats my next step compression test. Is there a way to check igniter coil because there is spark but not a blue spark like it should be.

07-02-2015, 07:44 AM	#8
jwalsh965 Getting Wild Join Date: Jan 2013 Location: st. john's nl canada Posts: 139	Re: Gas to carb still wont start compression check is next. is there a way I can check igniter / coil. Thanks for the help guys.

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