77 gl1000 crank no start


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99bonnie
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Motorcycle: 1977 gl1000

77 gl1000 crank no start

Post by 99bonnie »



I bought a 77 gl1000 a couple months ago for $50. Motor was locked so I rebuilt the motor. Got it in the bike a couple days ago and she cranks and sounds like it just might start but it doesn’t. Sprayed brake cleaner in the carbs to see if that will start it but it doesn’t do much. I’m getting spark, and compression passed the finger test. The best luck I have is holding down the start button and holding the throttle wide open, it back fires out the exhaust and pushes some smoke out but won’t start up all the way. I have no idea if my timing could be off or my points somehow aren’t correct. Any ideas would be great.


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winguyjo
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Re: 77 gl1000 crank no start

Post by winguyjo »

since you did major engine work, i would check that by doing a real compression test.
also, have you cleaned and gapped the points (or, better yet, replaced them) ?
99bonnie
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Re: 77 gl1000 crank no start

Post by 99bonnie »

If I’m getting spark wouldn’t the points be good? Just wondering first time ever working with something with points.
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Re: 77 gl1000 crank no start

Post by fatalbert »

Could you take a moment and explain what you did to rebuild the engine. A total teardown is not for the weak of heart and requires some knowledge of the internal workings of the components. A manual is essential. If you replaced the timing belt, which you should have, getting everything in sync is critical.

There are some very knowledgeable people on this forum, more so than myself, and they are willing to help with more information. Pictures are helpful to know what you are working on.

Congratulations on a good find.
99bonnie
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Re: 77 gl1000 crank no start

Post by 99bonnie »

Yeah so got the bike hasn’t run since the 90s so pulled the heads Because the motor was sized, the Walls on cylinder 4 were caked with some sort of residue and wouldn’t allow the piston to move. Pulled motor tore it down honed the cylinders just to get residue off, put new piston rings in and gaskets that’s it. I did the bare minimum to get the pistons out such as not taking everything last thing apart just the things I needed to, I’m 16 and this is my first full engine rebuild so I didn’t want to take everything apart and have room for more error. I did not replace timing belts since it’s got less than 10k miles on the bike so I figured they’d be alright just to see if the bike would start. Went through the process of timing, lining T1 up and the aligning cam gears. It seems to have a good spark when I pulled all 4 plugs and tried starting it, spark plugs also smell like fuel so I know I’m getting fuel. I’m leaning towards maybe off timing but I don’t see how it’s off because I just timed it.
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DenverWinger
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Re: 77 gl1000 crank no start

Post by DenverWinger »

Did you by chance get the ignition wires going to the two sets of points swapped? If so you will be firing all four plugs near bottom dead center of the piston strokes instead of on compression strokes. You'll have spark, maybe some backfiring out the carbs or exhaust but it won't do much more than that...
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99bonnie
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Re: 77 gl1000 crank no start

Post by 99bonnie »

I didn’t mess much with the wiring but I can check that because it backfires quite a bit.
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Maz
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Re: 77 gl1000 crank no start

Post by Maz »

99bonnie wrote: Mon Apr 13, 2020 9:19 pm Yeah so got the bike hasn’t run since the 90s so pulled the heads Because the motor was sized, the Walls on cylinder 4 were caked with some sort of residue and wouldn’t allow the piston to move. Pulled motor tore it down honed the cylinders just to get residue off, put new piston rings in and gaskets that’s it. I did the bare minimum to get the pistons out such as not taking everything last thing apart just the things I needed to, I’m 16 and this is my first full engine rebuild so I didn’t want to take everything apart and have room for more error. I did not replace timing belts since it’s got less than 10k miles on the bike so I figured they’d be alright just to see if the bike would start. Went through the process of timing, lining T1 up and the aligning cam gears. It seems to have a good spark when I pulled all 4 plugs and tried starting it, spark plugs also smell like fuel so I know I’m getting fuel. I’m leaning towards maybe off timing but I don’t see how it’s off because I just timed it.
You've checked the valve timing, but have you checked ignition timing ? The timing belts MUST be replaced! Sitting for that long, irrespective of mileage, those belts are extremely likely to snap if and when the engine fires up. If you haven't stripped, cleaned (PROPERLY cleaned) and, preferably, rebuilt the carbs, they will not function correctly.
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dingdong
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Re: 77 gl1000 crank no start

Post by dingdong »

Go to Randakksblog and read this article. https://www.randakksblog.com/starting-a ... ng-lay-up/
Then read every other gl1000 tech tip. Good luck. Dont try to run that engine without new belts. This is a interference style engine and there will be a minimum of two bent valves of one breaks.
You are also confusing cam timing with ignition timing. Two different procedures.
99bonnie
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Re: 77 gl1000 crank no start

Post by 99bonnie »

Alright thanks a ton I will get new belts ASAP and I forgot to say the previous owner took the carbs off to clean them and try to start the bike but he destroyed the carbs by using a hammer to get some of the jets out so I have “new” carbs on that I sonic cleaned and put new jets and gaskets in.
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Re: 77 gl1000 crank no start

Post by WingAdmin »

I know it's a simple thing, and you've probably checked, but if the battery is weak, it won't make enough spark - cranking uses lots of current, leaving little left for a good, hot spark.


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