78 GL1000 backfiring and won't start


Information and questions on GL1000 Goldwings (1975-1979)
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Lastwachter
Posts: 123
Joined: Sun Apr 06, 2014 9:47 pm
Location: Pennsauken, NJ
Motorcycle: 1978 Honda GoldWing
2000 Buell Blast

78 GL1000 backfiring and won't start

Postby Lastwachter » Sat May 17, 2014 4:45 pm



When I bought the bike, it would idle and rev. However, it was a rusted tank so this was done out of a gas can to show me that it worked.

I took off and derusted the tank (evapo-rust)
Changed the timing belts
Adjusted the valves
Changed the fuel lines
Swapped out the wiring harness for one that wasn't a giant rats nest

I tried starting her up with the actual gas tank on.
-Fuel on.
-Electrical working.
-All 4 plugs give spark.

I was getting back firing out of the exhaust, mostly from the left. I double checked the valves and tweaked a few and then also redid the belts. To the best of my knowledge everything is spot on. I followed the instructions to the letter and it all matches up.

It is still backfiring out of the exhaust as well as back up through the air filter on occasion (The air filter is off at the moment.)

Any ideas on what I should do next? It is so disheartening to be moving backwards...



SnoBrdr
Posts: 325
Joined: Fri Mar 07, 2014 9:01 am
Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

129K Original Owner

Re: 78 GL1000 backfiring and won't start

Postby SnoBrdr » Sat May 17, 2014 6:23 pm

Lastwachter wrote:When I bought the bike, it would idle and rev. However, it was a rusted tank so this was done out of a gas can to show me that it worked.

I took off and derusted the tank (evapo-rust)
Changed the timing belts
Adjusted the valves
Changed the fuel lines
Swapped out the wiring harness for one that wasn't a giant rats nest

I tried starting her up with the actual gas tank on.
-Fuel on.
-Electrical working.
-All 4 plugs give spark.

I was getting back firing out of the exhaust, mostly from the left. I double checked the valves and tweaked a few and then also redid the belts. To the best of my knowledge everything is spot on. I followed the instructions to the letter and it all matches up.

It is still backfiring out of the exhaust as well as back up through the air filter on occasion (The air filter is off at the moment.)

Any ideas on what I should do next? It is so disheartening to be moving backwards...


Don't see anywhere that you did anything to the carbs.

Lastwachter
Posts: 123
Joined: Sun Apr 06, 2014 9:47 pm
Location: Pennsauken, NJ
Motorcycle: 1978 Honda GoldWing
2000 Buell Blast

Re: 78 GL1000 backfiring and won't start

Postby Lastwachter » Sat May 17, 2014 6:26 pm

I have purchased the Randakk Carb Rebuild Kit. However, if the bike ran a month ago it would stand to reason that even if the carbs did need a good cleaning, that it would still run now, would it not?

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Fred Camper
Posts: 1152
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: 78 GL1000 backfiring and won't start

Postby Fred Camper » Sat May 17, 2014 7:31 pm

I would test the antibackfire valve. Bet that can be done with the rack installed but I have not done it.

Lastwachter
Posts: 123
Joined: Sun Apr 06, 2014 9:47 pm
Location: Pennsauken, NJ
Motorcycle: 1978 Honda GoldWing
2000 Buell Blast

Re: 78 GL1000 backfiring and won't start

Postby Lastwachter » Sat May 17, 2014 7:39 pm

Can the numbers on the coil wires labeled wrong? I was given the suggestion that maybe I accidentally switched the cables around. That someone had 1 and 3 mixed up and that happened. Well, I checked by the numbers on the OEM wires and they were correct, but for the hell of it I switched them around…it started to run with slight backfire. I walked around and switched 2 and 4 and it started right up and sounds great. I didn't have a chance to actually look at the wires to see if they were actually mislabeled. I will check tomorrow.

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Fred Camper
Posts: 1152
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: 78 GL1000 backfiring and won't start

Postby Fred Camper » Sat May 17, 2014 7:46 pm

Wow, that it ran at all with the wires backwards is interesting. So no more backfires??

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spookytooth
Posts: 152
Joined: Thu Apr 18, 2013 7:41 pm
Location: Houghton Lake, Michigan
Motorcycle: 1979 gl1000

Re: 78 GL1000 backfiring and won't start

Postby spookytooth » Sat May 17, 2014 8:44 pm

When I first read this I thought swapped plug wires but only on one side. The fact that you got it to fire at all with both sides swapped is some kind of weird mechanical marvel.

Lastwachter
Posts: 123
Joined: Sun Apr 06, 2014 9:47 pm
Location: Pennsauken, NJ
Motorcycle: 1978 Honda GoldWing
2000 Buell Blast

Re: 78 GL1000 backfiring and won't start

Postby Lastwachter » Sat May 17, 2014 9:43 pm

Actually I had the coils out since I had it running. When I put them back in I made the mistake of just going by the number labels.

SnoBrdr
Posts: 325
Joined: Fri Mar 07, 2014 9:01 am
Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

129K Original Owner

Re: 78 GL1000 backfiring and won't start

Postby SnoBrdr » Sun May 18, 2014 5:50 am

Lastwachter wrote:I have purchased the Randakk Carb Rebuild Kit. However, if the bike ran a month ago it would stand to reason that even if the carbs did need a good cleaning, that it would still run now, would it not?


Well I had said the carbs but you failed to provide all the needed info.

Glad that it now runs.

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Fred Camper
Posts: 1152
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: 78 GL1000 backfiring and won't start

Postby Fred Camper » Sun May 18, 2014 11:42 am

Fred Camper wrote:I would test the antibackfire valve. Bet that can be done with the rack installed but I have not done it.


There is no antibackfire valve. My bad. I was speaking to the air cutoff valve.

No longer important for Lastwatcher but cannot leave all the post errors uncorrected.

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spookytooth
Posts: 152
Joined: Thu Apr 18, 2013 7:41 pm
Location: Houghton Lake, Michigan
Motorcycle: 1979 gl1000

Re: 78 GL1000 backfiring and won't start

Postby spookytooth » Sun May 18, 2014 3:01 pm

Anti-backfire valve sounds suspiciously like a muffler bearing...

SnoBrdr
Posts: 325
Joined: Fri Mar 07, 2014 9:01 am
Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

129K Original Owner

Re: 78 GL1000 backfiring and won't start

Postby SnoBrdr » Sun May 18, 2014 3:17 pm

spookytooth wrote:Anti-backfire valve sounds suspiciously like a muffler bearing...


The anti backfire valve is in the carbs, once you rebuild them you can just tools it out as it's no longer needed.




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