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Terrible Gas Mileage (Read 1240 times)
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OK.... so what's the
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Re: Terrible Gas Mileage
Reply #60 - 09/14/08 at 12:58:40
 
"so confusing!!!!"

You can say that again!...Sorry can't be of more help.  

The boot between the carb and the engine is good, right?  No cracks, well seated?
If so, it's gotta' be spark...maybe the coil.  Or the plug wire.  Check the plug wire at night , in the dark, and see if you can see little lightning bolt trails of spark running down the outside of the wire.
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Sandy Koocanusa
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Re: Terrible Gas Mileage
Reply #61 - 09/14/08 at 14:11:24
 
It would appear your clutch safety switch is disabled.  I can't be certain, but can't see your neutral light shining either.  Could one of those be wreaking havoc when the engine hits a certain RPM?  I'm guessing now.  Never fooled with those yet.

It dies like mine does when I put the kickstand down and I'm still in gear, is why I ask.
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Savage: (adj)1. Wild 2. Uncivilized : Primitive 3. Ferocious 4. Cruel or merciless : Brutal --- Webster's. (n.) 1. A motorcycle named for its seat.--- Sandy's unabridged
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Re: Terrible Gas Mileage
Reply #62 - 09/14/08 at 14:20:18
 
Too bright to see the green light i guess but it was definately on. if my stand is down and the bike is in gear it doesnt hesitate to kill the motor and remind me who is boss =)
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Sandy Koocanusa
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Re: Terrible Gas Mileage
Reply #63 - 09/14/08 at 14:57:44
 
Hmmm...  It definitely acted like mine during an electrical shutdown, instead of running out of gas.  No cough, just instant nogo.  Although, the one time, when you eased on the throttle, it wanted to die but kept running when you stopped adding.  That makes me think it is RPM related, which takes me out of the running among competitors for who will figure it out.  I'm electrically challenged.

I recall someone awhile back having trouble with his stereo shutting off at a very particular RPM.  I can't remember who it was or whether he found a solution, but perhaps someone else will know.

Sorry, but for the moment I'm at a loss.  Gotta call in the Guys Who Know Stuff on this one.
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Savage: (adj)1. Wild 2. Uncivilized : Primitive 3. Ferocious 4. Cruel or merciless : Brutal --- Webster's. (n.) 1. A motorcycle named for its seat.--- Sandy's unabridged
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Re: Terrible Gas Mileage
Reply #64 - 09/14/08 at 15:45:44
 
I'm on dial-up so it took a while...but great idea using u-tube.  

You seem to have ruled out any fuel problem, so I have to say spark.
My understanding of rectifiers is that they are usually go-no-go, and the bike idles, you've changed plug,...so that leads to coil, or plug wire, plug cap.
RonAyers lists coil/plug wire at $70.00, cap at $14.00. Not sure that would fix it, but can't think of anything else.
Hope someone else has better news for you...

http://fiche.ronayers.com/Index.cfm/Module/Main/TypeID/26/Type/Motorcycle/Mak...
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Re: Terrible Gas Mileage
Reply #65 - 09/14/08 at 16:22:25
 
What exactly does the coil wire cap dealie do? how do they interfere with the bike being able to accellerate?
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Re: Terrible Gas Mileage
Reply #66 - 09/14/08 at 16:38:20
 
The coil makes the spark, that travels down the wire, to the cap, that sits on top of the sparkplug, that makes the sparkplug spark

My thinking is that if the coil is weak, it may not be able to provide the sparks at a fast enough rate to get off idle,..or if the wire is going bad, some of the spark is getting redirected to ground and the spark plug is only getting partial juice from the coil.

Look at the wire at night, and see if you see anything running down the outside of the wire.  Like trails of miniature lightning.  That would be a bad wire.
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Re: Terrible Gas Mileage
Reply #67 - 09/14/08 at 17:40:40
 
When the engine is idling, cylinder pressures are at about the lowest they will ever be. That makes it easier for the spark to jump the plug gap. As the throttle is opened the cylinder pressures rise, and it becomes more difficult for the spark to jump the plug gap. In turn, that means the spark voltage rises. If there is a weak spot in the insulation of the plug wire, such as a chafed spot, the spark may find it easier to jump that spot instead of the plug gap. If the plug is incorrectly gapped (too wide) the spark might not make it across under high-pressures. I'd start by changing the plug, as being an easy troubleshooting job (besides, after going through the work to get at it, you are better off changing it than fooling with trying it again). While all the parts are off you have good access to look over all the other wiring. If it will idle, the valves and the other mechanicals can't be far wrong, and it is exceedingly unlikely the same problem exists with both carburetors.
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Re: Terrible Gas Mileage
Reply #68 - 09/14/08 at 20:09:26
 
i did change the spark plug already so there is a brand new one in there. if i remove the tank to get in there to see the wires... how do i get the bike to turn on and see the possible sparks without a gas tank to feed the system?
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Re: Terrible Gas Mileage
Reply #69 - 09/15/08 at 08:24:25
 
Since you pretty much ruled out fuel,  the probelm can be weak spark OR low compression.  

As Charon said, idle is easy to make spark and also WOT, but mid range is the area were pressures and fuel mixture factors make harder to get enough spark.

I suggest you do a compression check first.  Not sure if you can rent a tester, I usually borrow on from my friends.   (taking a six pack of beer along .... that works wonders when trying to borrow stuff).   Remember that the decompression solenoid need to be disabled.

As for weak spark,  
- first check the battery.  It needs to be over 12 votls.  Actually I think over something like 12.1 or 12.5  but can't remember.    Here's a tip.   When I troubleshoot a bike,  I dig out my boat's trolling motor battery.   It's the same voltage (12V -14V) so it would hurt anything but has tons more resreve so you can fiddle around more before it goes dead.  Once the bike is running then put the MC battery back in.
- second,  check the wiring connectors for dirt or corrosion.  Clean as needed.
- thrid, that hard plastic cap thing (sparkplug boot) contains a resistor to help control radio interference.   It can go bad from heat (and we all know that the LS650 never makes any heat  .... NOT).   There is a resistance measurement listed in the manual.  If it measures bad replace it.



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Engineers design things, Technicians make them work.
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30% of being mechanical is confidence/30% is knowing to go slow when needed/30% is looking repeatedly at what you have/10% is dumb luck Wink
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Re: Terrible Gas Mileage
Reply #70 - 09/15/08 at 08:31:43
 
Ok,  just watched your YouTube video.     Question,  when you rebuilt the carb,  did you take the slide apart to check the white spacer???    If so,  are you sure it's back together correctly????    It affects the throttle response at about 1/8 to 1/4 throttle.  Back together wrong and it would be way too rich and the bike would stall with no backfire.

I see you are in S.A.    So is Youzguyz.     Maybe you could PM him and do a meet & greet to brainstorm a bit.

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Engineers design things, Technicians make them work.
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30% of being mechanical is confidence/30% is knowing to go slow when needed/30% is looking repeatedly at what you have/10% is dumb luck Wink
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Re: Terrible Gas Mileage
Reply #71 - 09/15/08 at 11:22:04
 
Okay so all that compression test talk might be a little over my head and I have no idea where to get a hold of a compression tester. If i can get a hold of one I will give that a try.


If the slide youre talking about is the giant black thing that goes down the middle of the carb from the top then no, i didnt take that apart. i just set that aside and then put it back in when everything else was shiney clean.
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Re: Terrible Gas Mileage
Reply #72 - 10/04/08 at 18:08:10
 
Alrighty team. I know its been a while but school and work have stolen so much of my free time. I got another coil-wire-cap combo from ebay. the bike has the same idling find no accel problem. I suppose there is a chance that the ebay listing lied

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=024&sspagename=ST...

thats the listing if it matters. I think that tuesday i will have this poor thing towed into the shop unless anyone else has any last minute clearity?
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We don't expect kittens to fight wildcats and win, we merely expect them to try.

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Re: Terrible Gas Mileage
Reply #73 - 10/05/08 at 10:26:12
 
PM received and repied
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2002 - Silver (Thumper)
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Most motorcycle problems are caused by the nut between the seat and the handlebars. Make sure yours isn't too tight or too loose.
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Re: Terrible Gas Mileage
Reply #74 - 10/18/08 at 10:39:01
 
CHECK IT OUT. the bike works after a ridiculous amount of time and brain busting effort. I remembered that when i took the carb apart to clean it the main jet was sitting the goo puddle... so i just removed it and the bike runs. the key to fixing things is REMOVING vital components? thoughts?
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We don't expect kittens to fight wildcats and win, we merely expect them to try.

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