Engine cutting out on acceleration
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From: NC USA
Hate to sound like I'm repeating the instruction sheet, but reckon I sorta am. The idle screw needs to be out about 3 or a little better. Using the choke (enricher) they will start, run fine at 1.5, but for some reason that slide changes the velocity of air or something and they require a LOT more open idle circuit. I'm assuming you switched the main jet holder that came with the kit? I never measured one and can't see the difference from OEM, but apparently there is one. And have you tried pulling the choke out a little when it's acting up to see what, if anything changes?
Again, just throwing out ideas because my ears can't hear it and my arms can't feel it but from my experience tinkering and experimenting with CV slides, sounds like you're very rich in the middle and lean on the low (idle) circuit.
Lots of guys hate the Thunderslide and/or recommend against drilling stock slides. Thing is, not everyone is willing or can afford the time to tinker, tune and experiment to get whatever combination dialed-in. Sometimes things come together real easy - sometimes not.
But most anyone will agree - each machine has it's own personality, habits and quirks, most of which are the same and predictable, others defy explaination....
hang in there
PS - DO go up to a 45, even with the screw out 3, you can always adjust that down if need be....
Again, just throwing out ideas because my ears can't hear it and my arms can't feel it but from my experience tinkering and experimenting with CV slides, sounds like you're very rich in the middle and lean on the low (idle) circuit.
Lots of guys hate the Thunderslide and/or recommend against drilling stock slides. Thing is, not everyone is willing or can afford the time to tinker, tune and experiment to get whatever combination dialed-in. Sometimes things come together real easy - sometimes not.
But most anyone will agree - each machine has it's own personality, habits and quirks, most of which are the same and predictable, others defy explaination....
hang in there
PS - DO go up to a 45, even with the screw out 3, you can always adjust that down if need be....
Last edited by t150vej; Jun 24, 2009 at 04:15 PM.
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So I went by another bike shop here in town and he told me quite differently than the other guy.
He said to go with a 48 slow and a 185 main............and put the needle in #3. He also said to turn the idle screw 2.5 turns.
I think I might try this.
Also you had written:
"Also, if the kit came with the new pump nozzle (pedestal) the destructions tell you to aim it at the overflow pipe in the bowl. That isn't the best direction as it will spray and splash on the front side of the carb throat. Twist it toward the opposite corner to the bolt hole and it will spray directly at the needle giving a much better pattern..."
I believe I have it lined up towards the center of the opening (right at the needle)???
Is this what you meant?
He said to go with a 48 slow and a 185 main............and put the needle in #3. He also said to turn the idle screw 2.5 turns.
I think I might try this.
Also you had written:
"Also, if the kit came with the new pump nozzle (pedestal) the destructions tell you to aim it at the overflow pipe in the bowl. That isn't the best direction as it will spray and splash on the front side of the carb throat. Twist it toward the opposite corner to the bolt hole and it will spray directly at the needle giving a much better pattern..."
I believe I have it lined up towards the center of the opening (right at the needle)???
Is this what you meant?
HDF Community Team
Joined: Dec 2005
Posts: 5,377
Likes: 2,574
From: NC USA
Also you had written:
"Also, if the kit came with the new pump nozzle (pedestal) the destructions tell you to aim it at the overflow pipe in the bowl. That isn't the best direction as it will spray and splash on the front side of the carb throat. Twist it toward the opposite corner to the bolt hole and it will spray directly at the needle giving a much better pattern..."
I believe I have it lined up towards the center of the opening (right at the needle)???
Is this what you meant?
48 is usually a little fat for the add-ons you have but you can trim that with the idle screw. And 185 isn't too bad, but you may lose the throttle response "zip" that is the thunderslide attraction. But then, you may end up in 2 groove with that, and have a real winner.
I certainly respect anyone with determination and patience - last word of advice; make changes gradually, one thing at a time (with maybe the exception of the needle position from 7 to 3 - 4) so that each modification or adjustment can be analyzed and consequent adjustments made accordingly
Last edited by t150vej; Jun 24, 2009 at 07:46 PM.
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Last night I threw in the 185 main and 48 slow (my shop guy said I should go to 48 instead of 45).............and moved the needle to #3. I also had the mixture set at 2 1/2 turns out.
I took it for a short 5 mile spin (got up to maybe 50 mph) and it ran just fine. Seemed to have good response all through the rpm range and it had no pops or farts. Hopefully I'll be able to let her open on the highway today and see how she does.
Would you just read the plugs now to see if it needs another needle adjustment?
It is idling fine at 1000-1200 rpms. Would you mess with the mixture any more?
Thanks for all the help.
I took it for a short 5 mile spin (got up to maybe 50 mph) and it ran just fine. Seemed to have good response all through the rpm range and it had no pops or farts. Hopefully I'll be able to let her open on the highway today and see how she does.
Would you just read the plugs now to see if it needs another needle adjustment?
It is idling fine at 1000-1200 rpms. Would you mess with the mixture any more?
Thanks for all the help.
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