bike dies @ around 3500rpm neutral or trying to move forward


Information and questions on GL1200 Goldwings (1984-1987)
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rockinmtnbiker
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Motorcycle: 1986 GL1200A Aspencade

bike dies @ around 3500rpm neutral or trying to move forward

Postby rockinmtnbiker » Sun Mar 13, 2011 11:04 am



Any suggestions? '86 aspencade, 33,000 miles, battery is new, ran perfect last fall. Idle is perfect, starts up just fine, I put new gas in her before trying to ride around the neighborhood. I got around the block, but when attempting to go uphill, it sputtered and died. Started right back up, but under any kind of load or forward momentum, the engine just dies out. I was able to putt it back into the garage, and when revving the engine in neutral above ~3400rpm it sputters and dies again. Any suggestions or links to other forum postings will be helpful!



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virgilmobile
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby virgilmobile » Mon Mar 14, 2011 10:18 am

It's got to be lack of fuel or spark.Can you pull one plug wire,attach a old plug to it,lay it on the block,start the engine,rev to 3500 rpm(where it dies) and see if the spark dies?Process of elimination.

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WingAdmin
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby WingAdmin » Mon Mar 14, 2011 10:57 am

When it sputters, can you bring it back to idle and it comes back to life? Or does it die from that point forward? And if so, how long before it will start up normally again?

rockinmtnbiker
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby rockinmtnbiker » Mon Mar 14, 2011 12:42 pm

When it sputters, I let off the throttle in neutral and it goes back to idle just fine. Also starts right back up just fine after dying and idles fine. @virginmobile, I will try your spark plug suggestion. Anything helps!

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virgilmobile
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby virgilmobile » Mon Mar 14, 2011 1:05 pm

Second thought,If it returns to an idle ok,the carbs may not have enough fuel to sustain a high rpm or load.I suspect,by your last post it may be fuel starved,But do eliminate the ignition as a problem.It's easy to check.If the sparks ok then attack the fuel problem.Easy stuff first.

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thrasherg
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby thrasherg » Mon Mar 14, 2011 1:31 pm

Sounds very much like fuel starvation. I would try removing the fuel line where it connects to the carb. Put a container underneath to catch the fuel and see how quickly it flows out.. I suspect you have either a blocked filter, defective fuel pump, blocked tank breather or any combination of those 3 things!!

Gary

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virgilmobile
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby virgilmobile » Mon Mar 14, 2011 1:44 pm

If the fuel system is like my 84 interstate gl1200,the fuel pump is an electric pulse type and only operates when the engine is turning over.It will not pump fuel if the engine is stopped.I haven't looked into a electrical bypass method to test yet.Let us know if you need troubleshooting help.

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virgilmobile
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby virgilmobile » Mon Mar 14, 2011 1:57 pm

These pix may help.Virgil
Attachments

rockinmtnbiker
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby rockinmtnbiker » Tue Mar 15, 2011 8:45 am

Thanks for all the suggestions. Now all I need is the time to work on it! I will keep everyone updated as I troubleshoot.

rockinmtnbiker
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby rockinmtnbiker » Tue Mar 15, 2011 8:49 am

virgilmobile wrote:These pix may help.Virgil

Something about shorting the wires with a jamper?? I am unfamiliar with that...

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virgilmobile
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby virgilmobile » Tue Mar 15, 2011 9:16 am

JAMPER ...I think it's a translation from Japanese meaning "a short hunk of wire".It's similar to "karaoke" loosely translated means "to sing badly".

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thrasherg
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby thrasherg » Tue Mar 15, 2011 10:07 am

Probably meant Jumper, a term used to mean a short piece of wire used to complete an electrical circuit (Basically shorting two points together with a piece of wire!!).
Gary

rockinmtnbiker
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Joined: Tue Jun 01, 2010 4:38 pm
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby rockinmtnbiker » Tue Mar 15, 2011 12:14 pm

thrasherg wrote:Probably meant Jumper, a term used to mean a short piece of wire used to complete an electrical circuit (Basically shorting two points together with a piece of wire!!).
Gary

That is what I figured given the context of the word. I didn't want to assume anything though... Thanks

rockinmtnbiker
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby rockinmtnbiker » Tue Mar 29, 2011 2:36 pm

OK, so I replaced the fuel filter (cheapest and easiest thing first) and still having the same problem... All the wires are firing, but have not replaced the plugs yet. I think it is my next step.

rockinmtnbiker
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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby rockinmtnbiker » Wed Mar 30, 2011 8:23 am

UPDATE: My father-in-law came by yesterday (original owner of the bike), and I explained to him what was going on and what I had done and read. He fires it up, revvs the **** out of it for about 45 sec, and now it runs fine... **(any thoughts???)***took it for a quick 5 mile cruise and got back w/ no problems. I am still going to look into getting new spark plugs, it has been at least a couple of years on them. Will fire it up again today after work to see if it is still running right. I'll keep you posted.

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Re: bike dies @ around 3500rpm neutral or trying to move for

Postby starfleetengineer » Wed Mar 30, 2011 11:30 pm

I've done that with cars. If I had to guess, I would say 1 of 3 things it could have been.
1. Main jets got plugged.
2. Plugs were fouled enough to cause the problem.
3. The slider jets that operate by vac," can't remember their name" but they might have been stuck in their bores.
Run some Sea Fome in the gas. Every other tank full. Check you gas tank for dirt and loose rust. Ittity bitty particals can get by the filter to collect in the bowls and after time get sucked up in the jets.


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