carburators


Information and questions on GL1500 Goldwings (1988-2000)
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shortster
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Motorcycle: 1997 gl1500 asp

carburators

Post by shortster » Wed Aug 08, 2018 10:02 am



I posted earlier about carb cleaning, as per advice of a mechanic, but seems like maybe another problem. 1997 1500 asp. when cranking after sitting overnight and cold engine, the engine does not start up without turning over a lot of times, sometimes backfiring before running, choking doesn't seem to help. Question is what could be causing the failure to fire up right away, without cranking over several times, sometimes have to let sit for awhile before it will crank and then runs kinda rough for a while, then will get better , does this sound like carb problem.



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RBGERSON
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had every year from 75 to 83

Re: carburators

Post by RBGERSON » Wed Aug 08, 2018 10:08 am

Could be weak battery or loose connections in the start circuit..battery, relays etc.
HAD LOTS OF GOLDWING 75-83
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baumedagn
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Re: carburators

Post by baumedagn » Wed Aug 08, 2018 2:28 pm

+1 On the battery. Check the voltage while you're trying to start the bike. The 1500 is a power hungry beast. Also, the running poorly after you do get it started could just be that it's been flooded while cranking on it.

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wingdings
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Re: carburators

Post by wingdings » Wed Aug 08, 2018 3:53 pm

hi saw your post there !! - defo think this is the battery - how old is it ?? is it more than 3yrs old ?? if so maybe time to replace it - I use a motorblatt on my wind its a gel mat battery gives 20% more cranking power over a lead battery one also check all the connections around starter relay circuits and the starter selinoid bolts yes there are two starter solinoids on the 1500 - I repaired my friends wing a month a two back and found the second starter selinoid connecter had worked lose that was causing very same problems as you have stated ... :D :D :D :D

shortster
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Re: carburators

Post by shortster » Wed Aug 08, 2018 6:05 pm

I do have the compufire alt on the bike, but also have gel battery 2 years old. Will check for loose connections, the engine spins over very strong , not like a weak battery

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ct1500
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Re: carburators

Post by ct1500 » Wed Aug 08, 2018 6:27 pm

Check your spark plugs and if they are old and carbon fouled that will cause a hard start condition. If unknown when they were last changed just go ahead and replace. A leaking float bowl gasket(s) will also require a long cranking time to refill bowls with gas to start.

A properly tuned and running 1500 will start within a second or two, even from a summer overnight cold start with a couple twists of the throttle (no choke).

A weak battery would typically give a release type start symptom not the extended cranking.
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wingdings
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Re: carburators

Post by wingdings » Fri Aug 10, 2018 10:28 am

- P.M - virgilmobile - on here - he has a 88 - and has helped me in the past too !!! - he great with starting problems too !! - also have a look at my posts I sure there is something in there that may help you there :D :D :D :D viewtopic.php?t=23775

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virgilmobile
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Re: carburators

Post by virgilmobile » Fri Aug 10, 2018 10:47 am

Does it backfire into the intake or exhaust?

shortster
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Re: carburators

Post by shortster » Fri Aug 10, 2018 8:23 pm

It seems like to me that it does not go out the exhaust.

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virgilmobile
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Re: carburators

Post by virgilmobile » Sat Aug 11, 2018 10:06 am

When you first try to crank it.Do you open the throttle or leave it closes and do you use the choke first thing and how much?

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Mh434
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Re: carburators

Post by Mh434 » Sat Aug 11, 2018 11:33 am

In general, the only things that can cause backfiring out the carbs are valve timing (specifically intake valves) and ignition timing. Unless the timing belts have just been replaced, and the valves are way off or bent (as a result of an improperly performed timing belt replacement having just been performed) I think we can rule out the former.

I have heard of an intake valve becoming stuck open, but that appears to be an extremely rare occurrence.

That leaves ignition timing, as though one or more plugs may be firing on the intake stroke, or some other anomaly. In order to backfire up through the carbs, a plug MUST be firing at the wrong time.

I have never personally looked into the ignition timing on a 'Wing, but it may give you another avenue for investigation. Personally, I suspect the problem is electrical, rather than carb-related. Most electrical problems on 'Wings (other than problematic relays) seem to be as a result of bad grounds.

I've also read of a rare occurrence of a broken (but visually okay) spark plug causing this problem.

Just thought of something else - check to make sure the contacts for fuse #11 are clean. Temperature changes can exacerbate issues with contact points that are dirty, so if they're not great perhaps the contact becomes iffy when it's cold....

Just spitballin' here, looking for possible answers

shortster
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Re: carburators

Post by shortster » Sat Aug 11, 2018 12:17 pm

virgilmobile wrote:
Sat Aug 11, 2018 10:06 am
When you first try to crank it.Do you open the throttle or leave it closes and do you use the choke first thing and how much?
Right now it will spin over a large number of times without starting, using choke or no choke, sometimes it fires right up without adding throttle or choking, then runs rough until warms up a little, sometimes requires some choking to keep rpm up and run smoothly

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Mh434
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Re: carburators

Post by Mh434 » Sat Aug 11, 2018 12:41 pm

Sure starting to sound like a bad #11 fuse connection to me...GL1500's usually fire up almost instantly (as long as the battery's strong & they have fuel), so I'd suspect an electrical fault. The vibration from cranking may be enough to occasionally get contact on the fuse & allow it to start.

That's where I'd start. It's a free fix if that's the problem (the very best kind of fix!), and zero lost if it's not.

Failing that, I'd also check the relay contacts in the relay box (perhaps relay #6 in particular, as it provides power to some of the ignition system) just aft of the fuse panel. Bad relays/bad relay contacts can cause all sorts of issues in GL1500's, many of which are...weird and unpredictable. Again, it's a free fix, although it requires more work as you have to loosen the left saddlebag bolts & jockey the bag out of the way some to access the relays.



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