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Buell Forum » THUMPer Forum » Buell Blast Thumper Knowledge Vault » Diagnosing problems: » Blast starts then dies with throttle » Archive through May 09, 2014 « Previous Next »

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Dj49
Posted on Wednesday, April 23, 2014 - 08:16 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Any help appreciated. I replaced my stator over the winter, it was beat, bolts sheared off inside the case grounding out the stator. Stator testing now reads good. Bike ran good prior to taking off VH exhaust to jack up bike. After putting everything back together bike finally started, when throttle is applied bike dies. On a hunch I replaced the voltage regulator. Still same problem. Also did some minor aesthetic work (led flashers and hid headlight)I don't see any cracks in das boot, have about a half a tank of gas, battery tests good. I have moderate mechanic skills but a decent support crew I can call on with some electrical know how...any suggestions? Almost forgot...error d08 read when I went through diagnostic(speedometer over voltage), I found somewhere the cause could be voltage regulator, that's why I replaced it.
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Ezblast
Posted on Wednesday, April 23, 2014 - 10:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Start with new gas and starter fluid - see if it turns over.
EZ
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Kenny_gilgore
Posted on Thursday, April 24, 2014 - 03:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

DJ,

Have you checked the fuel tank vent hose to make sure that it is not obstructed?

Kenny G
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Jetlee
Posted on Thursday, April 24, 2014 - 04:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Check that your needle jet (aka collar) is poking up into the throat of the carb about 1/8" from the bottom. The slide needle should be going down into it.
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Ezblast
Posted on Friday, April 25, 2014 - 03:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

All good things to check.
EZ
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Swampy
Posted on Friday, April 25, 2014 - 10:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If you had it sitting for a long time maybe you have the main jet clogged from varnish?
Runs at idle means your idle circuit is working but not the main...
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Ezblast
Posted on Saturday, April 26, 2014 - 03:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Clogged needle?
EZ
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Dj49
Posted on Monday, April 28, 2014 - 01:33 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have put new gas in and sprayed starter fluid into intake. No go. Vent hose had slight kink I now have that just freely to the side of the bike. I put a new HD plug in today fired right up took a little throttle then died at idle. Won't restart. Collar seems to be up between 1/8 and 1/2. Needle goes in. How do I check clogged needle?
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Dj49
Posted on Monday, April 28, 2014 - 01:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Correction Between 1/8 and 1/4 the collar is up
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Ezblast
Posted on Monday, April 28, 2014 - 03:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The needle is the part going into the collar - can be gotten to from top of carb - careful when opening top not to loose spring.
EZ
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Dj49
Posted on Monday, April 28, 2014 - 04:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

How do I clean, fine wire?
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Jetlee
Posted on Monday, April 28, 2014 - 04:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I've never had any issues with using carb cleaner to blast out every orifice in a Blast carburetor.

I've even had a carb sit for a year and turn all green and gummy ... carb cleaner made it good as new.

Just blast the hell out of it.
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Buellridertomisb
Posted on Monday, April 28, 2014 - 05:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So I have been having the same problems. Bike starts like a champ! Idles for a few minutes without problems and I give some throttle and it bogs down. It acts like it won't get any fuel, but I see it spraying into the carb with throttle. I can ride about 1/4 mile and it starts to run rough. I will have the throttle about 1/2 way and it gets up to speed, then dies almost like the speed governor safety then it restarts just as suddenly.
Replaced the boot, ran seafoam through it, pulled the spark plug, (it was black and covered in carbon) and replaced it. Am I missing something?
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Dj49
Posted on Monday, April 28, 2014 - 08:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'll try spraying it tomorrow and if that doesn't work I'll try to take the top of carb off and clean like that. Thanks for now...
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Kenny_gilgore
Posted on Monday, April 28, 2014 - 09:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Double check the slight kink in the vent hose. The slight kink in my vent hose turned out to be a total blockage.

Kenny G
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Kenny_gilgore
Posted on Monday, April 28, 2014 - 09:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Double check the slight kink in the vent hose. The slight kink in my vent hose turned out to be a total blockage.

Kenny G
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Blueblast
Posted on Monday, April 28, 2014 - 11:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Possilby a pinched slide diaphram?
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Jetlee
Posted on Tuesday, April 29, 2014 - 10:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You need to remove it to clean it, otherwise you're just blowing the crap from place to another.

1. Remove carb
2. Remove fuel bowl
3. Remove slide cap and slide
4. Spray everything out with carb cleaner

Assembly is reverse.}

(Message edited by JetLee on April 29, 2014)
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Gearheaderiko
Posted on Tuesday, April 29, 2014 - 11:30 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)



Yeah, I'm betting that's a bad idea.

My guess is we're about to be taking the shotgun approach to repair. Running this bad equates a problem not likely to be remedied by cleaning.

Pull the slow jet and replace with a #45.

If the slide moves, it's probably fine.

Have you done anything to the carb? Anything?

Dieing like this can be caused by a bad safety switch.
Or a clogged slow jet. If you don't know what a slow jet looks like clean, it's probably best to get a new one and replace it.
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Dj49
Posted on Tuesday, April 29, 2014 - 03:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have done nothing to the carb other than slide it up and down with my finger to make sure it slides. I do not know what a clean slow jet looks like. What about this safety switch?
I will double check the kink also
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Gearheaderiko
Posted on Tuesday, April 29, 2014 - 04:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Buy a #45 slow jet. Very common on stock Harleys and should be readily available from any dealer. The majority of all Harley CV carbs use the same jets.

Loosening the gas cap will solve any vent issue.

Clutch safety switch, neutral safety switch, kickstand safety switch can go bad causing the engine to die if the fault is intermittent.

FWIW: The auto enrichener (choke) overrides the slow jet. As the 'choke' comes off (opens) the slow jet comes into play and if the slow jet is clogged the bike dies.
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Dj49
Posted on Wednesday, May 07, 2014 - 07:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ok so got my blast running. Kickstand up did the trick as well as tweaking the idle a little bit. Ride it for about 20 miles. Then same symptoms as before I replaced stator. First speedo dies, then blinkers don't work. Within a mile flat power loss....stumped. Ignition module?
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Ezblast
Posted on Thursday, May 08, 2014 - 12:43 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It's a 2001 - could be - did you replace the intake coupler?
EZ
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Dj49
Posted on Thursday, May 08, 2014 - 08:24 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

EZ. Are you talking about the boot? It's a flat power loss. Same symptom as before I replaced the stator. Stator now tests good. How do I check the ignition module?
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Dj49
Posted on Thursday, May 08, 2014 - 08:25 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The boot is in good condition. No cracks or tears.
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Ezblast
Posted on Thursday, May 08, 2014 - 11:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

A 2001 - replace the boot - why even question it - it's cheap, and unless your nickname is eagle eye - I will tend to dis-agree with you on it's probable state. At the top of the page the first thing to check and if any doubt about - aka - if it doesn't look brand new - replace - period.
EZ
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Dj49
Posted on Friday, May 09, 2014 - 09:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ok. Point taken. Thank you. I will replace it. I am baffled still that this would affect my electrical system? Speedo out, signals don't work, neutral light flickers...can you shed some light on this please?
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Gearheaderiko
Posted on Friday, May 09, 2014 - 11:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

There is no correlation between the two. But EZ wants to completely eliminate a very common cause of problems, rather than risk further diagnosis with a possible weak link still in place.

I've had your problem, but I don't know if I solved it. I replaced the speedo which seemed to be the culprit, but until I get a few more miles, I won't know. Problems are tough to diagnose when they are inconsistent.
Make sure all battery and ground connections are tight. If you notice any corrosion, clean it up first. If any cables seem "crunchy" or inflexible, they should be replaced.
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Gearheaderiko
Posted on Friday, May 09, 2014 - 11:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

PS if your clutch cable is getting hot, you have a bad ground.
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Ezblast
Posted on Friday, May 09, 2014 - 12:26 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ahh - that could well be your speedo sensor - I was reading about your earlier issue. It could also be a jacked wire in the area of the neck of your harness - have you tried playing with it to get it to work intermittently? If it is all down - I would suspect sensor, and/or speeedo it's self. I've had both go on me - at the same time as well.
EZ
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