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Frznfury
Posted on Monday, February 14, 2011 - 01:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I haven't found this problem elsewhere... on any bike forum, so I decided to post it here.

My 2001 Blast just accelerates, gradually and continuously once the engine is started with no way to slow it down short of cutting it off with either the switch or at the petcock. Once it gets close to redlining it just stays there, Blasting away.

Unfortunately the only mechanic in my area who'll even look at it is convinced it's missing an Accelerator Pump, as he truly believes that it's half a Sportster, despite all indications to the contrary.

I've done all the maintenance on my baby since I acquired her a few years ago, but this just baffles me. Anyone run across this problem before?
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Gearheaderiko
Posted on Monday, February 14, 2011 - 01:53 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Have you checked the "Das Boot" (intake coupler)? If its split it will do as you say, especially if the auto enrichener is stuck on.
BritChris has the same problem and he just parked his bike log term: (

Blast doesnt have an accelerator pump and wont run very well with one. Though the carb still has the molding for one (but I think you knew this already).

Have you done anything to the bike prior to this happening? Anything at all? Was there anything that happened prior to this? Backfiring? Stalling? etc.

And the throttle cable isnt stuck? Just a little will do it.
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Dakatak87
Posted on Monday, February 14, 2011 - 01:53 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

i think your carb might have a bad diaphragm. sounds like the vacuum is doing the wrong thing. how quickly does it reach red line? not much else to go wrong with a motorcycle
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Ezblast
Posted on Monday, February 14, 2011 - 02:25 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Also check to make sure your throttle cable isn't binding anywhere.
EZ
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Johneblast
Posted on Monday, February 14, 2011 - 09:03 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Frznfury, welcome. My 2001 had the same problem. As EZ would say, "das boot". I replaced it and the auto-enrichner and viola! back to idling like she should. If the boot is in good shape, you may just need to tighten the hose clamps a bit. The wax in the auto-enrichner will get "gummy" after some time. If it hasn't been changed in ten years, as mine, you may want to do it.
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Frznfury
Posted on Saturday, February 19, 2011 - 01:35 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks for the tips guys. I checked the cable first and it's spinning free. I do not believe that it's das boot, since I replaced the last one with the steel-bound eBay version (Great guy, by the way. The first one split somehow and shipped me a replacement free of charge.).

The diaphragm is something I hadn't really considered, but that's mostly because I've been telling myself it must be the auto-enrichener. Is there a test I can do that will determine which of these I could be looking at?
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Ezblast
Posted on Saturday, February 19, 2011 - 10:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Look where your throttle adjustment is and check that the clamp excess is not caught on your idle adjuster.
EZ
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Kauai1800
Posted on Sunday, February 20, 2011 - 02:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Both times my bike did this I discovered that even though I thought I had the clamps on das boot tight enough, tightening the clamps made this problem go away. Those puppies have to be tight (but not so tight as to cut the rubber).
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Frznfury
Posted on Thursday, February 24, 2011 - 01:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

That's a good point EZ, but this aftermarket boot has a different compression-screw-thingie that lacks the excess material you're talking about.

I'm headed up to look at her on sunday, to tighten the clamps and check the diaphragm. Seems to me the auto-enrichener shouldn't be the problem, but I'll be disconnecting that as well.

All this 80-degree weather is killing me, I need to ride!

P.S.: If you ever call Legacy HD in Odessa-Midland looking for parts, just tell 'em it's a Sportster instead of a Buell. The first price I got quoted for the diaphragm was sixty bucks! When I called back the next day and said it was for a Sportster with the same carb, they said it was fifteen!

P.P.S.: My reading has turned up, unsurprisingly, that the CV40 is super-common. Pretty much any HD since 1990 uses one (Albeit with an accel pump). We also have common ground with a '97 Kawasaki Vulcan 1500 (That one has a heater loop in the float bowl). Our local Honda dealer quoted me fifteen on that diaphragm too.
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Gearheaderiko
Posted on Thursday, February 24, 2011 - 08:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"The first one split somehow and shipped me a replacement free of charge." If one went bad, why couldnt two?
Its a great product, but somehow I'm not convinced that you still couldnt over or under tighten it. The most I've heard them last is 10,000 miles. I've gotten that much out of a stock boot, unsupported carb many of those miles.

If you unplug the auto enrichener it will be stuck in the on position (if its at all working properly). Which means it should be very, very rich at idle and low speeds (after warm up).

All the information you posted is here at the Thumper forum and Badweb, plus much, much, more!!! : )
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Ezblast
Posted on Thursday, February 24, 2011 - 10:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

That clamp thing happened to me - lol - twice! Blew out 4 filters with fire, bike rev up supper quick, hit the limiter and and spit fire - poof! - there would go the filter - lol - inspect the whole throttle path carefully - once I got the cable partially snagged in the clamp and I only found that by looking it over closely - at a casual glance it looked fine (vibration loosening it over a long period of time)so it would roll itself to a certain point but no higher - lol - still weird to have your bike rolling on the throttle and your not moving your hand.
EZ
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Imblasted
Posted on Wednesday, June 22, 2011 - 11:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

i had this same problem when i bought my blast. It would idle fine for a while 5-10 minutes until it warmed up, then it went to redlining at idle. I adjusted the idle/throttle stop and she stopped that nonsense.

just my 2 cents...
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