blower carb problem and parts source?

[pvan]

Howdy,  Pulled out my bike after sitting for months and I had a problem with the fuel regulator overrunning the carb jets and puking gas all over the engine when I first started it up then it cured itself but any suggestions on how to fix will be appreciated?
Could JK or someone recommend a parts source for the Mikuni carb on our supercharged bikes as possibly replacing the Mikuni jets should cure my problem? What size jets and where can I buy replacements?
Thanks in advance for your feedback.

[Jeff K]

Yours has a Mikuni carb? The newest kits have Mikuni's

You shouldn't need a new jet. Most likely just needs a good cleaning.
Or your pressure regulator is shot. If it is the one that came with the kit... its junk.

[pvan]

JK I replaced the original crappy fuel regulator with a nicer adjustable Holley unit a couple years back. My 2004 kit is the Harley carb that I was told is built by Mikuni.
What in the carb allows gas to bypass and spill out?

All I have ever heard is when it pukes gas the fuel reg is set too high but mine is not set too high as it has worked good for years, got any other suggestions? thanks

[fstsix]

OK let see did You say The Harley Carb is Mikuni that came with the blower kit One way to figure out If it is Mikuni Your gas tank MUST have a 1-1 1/2 spacer at front mount. But do you have fuel pressure gauge these carbs Motorcycle that is, cant take more than 1-1/2 lb pressure or it will flood out overflow. So dont do what i did trying to jet before checking fuel pressure the Holley fuel regulator is quality part but make shure its the 1-4 lb and set it to lowest setting with gauge. The Lamonster kit always came with Kehin CV carb.

[Jeff K]

JK I replaced the original crappy fuel regulator with a nicer adjustable Holley unit a couple years back. My 2004 kit is the Harley carb that I was told is built by Mikuni.
What in the carb allows gas to bypass and spill out?

All I have ever heard is when it pukes gas the fuel reg is set too high but mine is not set too high as it has worked good for years, got any other suggestions? thanks

It's a Kehin carb.
Pull the bowl and clean it. Flush some fuel through it. No big deal.
Parts can be had at and HD shop

[pvan]

Thanks, my fuel pressure is about 3.5lbs. I have been at 3.5 for a couple years with never a problem and was running over 4lbs with the old regulator because I am concerned about running out of fuel so have always run the highest pressure I can get away with.
What is it in the carb that holds the pressure back and how does the overflow work? is it a spring in the jet or what? thx

where could I get a fuel pressure gauge that goes all the way down to 1lb as the one I have goes no lower than 3 lbs?
Must be a Kehin carb as fstsix mentioned because my kit is 5 years old, thx

[fstsix]

Pvan Motorcycle carbs Are Gravity fed not wanting pumps.So The Holley automobile regulator  is Low pressure high volume for bigger HP than our motorcycles I have had a Mikuni 45 for years and found that unlike that POS regulator that came with the Blower kit you will not starve your bike on top end freeway speeds. Back that regulator down and should solve your flooding. Keep us posted.

[Jeff K]

Thanks, my fuel pressure is about 3.5lbs. I have been at 3.5 for a couple years with never a problem and was running over 4lbs with the old regulator because I am concerned about running out of fuel so have always run the highest pressure I can get away with.
What is it in the carb that holds the pressure back and how does the overflow work? is it a spring in the jet or what? thx

where could I get a fuel pressure gauge that goes all the way down to 1lb as the one I have goes no lower than 3 lbs?
Must be a Kehin carb as fstsix mentioned because my kit is 5 years old, thx

What I do is...
I set the pressure so it has about 1-1/2 psi at WOT.
I hook up a temporary fuel pressure gauge on the inlet of the carb bowl. I tee it into the line. Then I go out and do a few WOT runs 3rd gear. If you can hold any pressure in the line the bowl should be filling fast enough.
I have seen 3-4 psi on the gauge at idle and when you go WOT the reg can't keep up. So the carb starves, motor goes lean.
The aftermarket regulator should prevent that. but I always check.

The carb has a float with a rubber tipped needle. The needle plugs the fuel feed when the bowl is full. Trash under the needle can hold the needle up allowing fuel to flow.



http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=93547

[pvan]

Thanks JK and fstsix, My 03 only has 7,000 miles, it lives under a blanket in my garage so I bet it trapped some debris under the needle that flushed itself out . I am going to grab one of those fuel regulators thanks for link JK I will do a WOT test.

What is the model # of Kehin carb so I can get a new rubber seat
for the needle valve just for insurance.
My local Harley dealer Shumate was shut down by Harley for not paying for bikes they sold so I will need to order carb parts on  line, where do you guys go for Kehin parts? thanks guys

[fstsix]

ONE more thing on that WOT test ----HANG ON---!!!!  

[fstsix]

UH part #  Should be standard 40mm CV HD carb. BTW to all HD guys looking at this thread IT DOES SAY MADE IN JAPAN on it LOL.

[pvan]

Thanks guys for the info and fstsix no problem hanging on my S/C Valk at WOT due to my other bike is a new naked Hayabusa 520lbs with over 180rwhp.http://vrcc.photostash.com/vrcc_25850/photo%20(37).jpg

[fstsix]

Yep no problem there. Still like that Video on Utube (Busa VS Boss Hoss) With all due respect to my Boss Hoss friends.   

[fstsix]

Yep no problem there. Still like that Video on Utube (Busa VS Boss Hoss) With all due respect to my Boss Hoss friends.   

Sorry that was Ninja.

[pvan]

Hey fst6 On my S/C Valk from a deadstop I whipped a small block Boss Hoss without even having to use my N20. But another old guy has a big $70,000 Donavan 600ci Hoss and I outrun him until about 100 then he pulls away hard and leaves me for dead.

I am on the lookout for that 600ci Hoss with my new tuned by a Muzzy shop naked Busa. I had only 26 miles on the Busa when I twisted it up to only 9,500 rpm  in 3rd gear and was going 130mph... and its a six speed. My Busa rev limiter is now set @12,000 and the factory 158mph speed limiter is gone. Net...when I find enough road and the big Hoss we will find out who has what.

Since this is a tech board what is the NAPA part # for the blower belt? thx

[Jeff K]

Since this is a tech board what is the NAPA part # for the blower belt? thx

I use a 040320 belt.

[fstsix]

Boss Hoss got a old friend retired down in Ocala Florida Sold his 502 and Brought his new Hoss up here last year  640 ci Merlin all aluminum 640 hp W/ 350 shot Nitrous. Bob Used to ride Valkyrie with us up here. I think i would hurt myself 

[pvan]

Thanks JK

Fst6 The big Hoss bikes I have run do not hook up from a stop they spin bad.

That big Merlin Hoss has too much suds w/o the N20... so the juice is basically just a talking point at bike night.

[fstsix]

PVAN  You got that right on the tire spin on the Hoss, Need about 24" slick to hookup. I have mentioned about pulling the trigger on his Hoss and he just Smiled. So here is what my wife thinks about the overkill bikes and some of us Motorheads It is just a Extension of our PENIS. I replied SO GIRLS ALWAYS GET BOOB JOBS  I defended all our extensions.    And our Motorcycles.

[fstsix]

Hey PVAN. You still out there? What NOS system do you have is it wet or dry? and what hp jet you got in it. Any info or web sites been snooping around. Thanks in advance.

[fstsix]

http://www.youtube.com/watch?v=cn20SUWmW5o#watch-main-area                                  To all my blower friends i have found this meltdown of old friend Dave Connally .I use to hang with him and his father Bob in the 80"s He set World record with his Family Day Cruiser boat Please see ( GN  record on the U tube page ) I had him work on my 1984 Eliminator V drive 3 speed auto C-500 prop he flipped the boat and Bob his father sold the business after son Dave broke his hip that day and was in wheel chair BTW feel the pain on ( lean ) carb syndrome. FSTSIX

   BTW this is( PG )  language

[fstsix]

http://www.youtube.com/watch?v=cn20SUWmW5o#watch-main-area                                  To all my blower friends i have found this meltdown of old friend Dave Connally .I use to hang with him and his father Bob in the 80"s He set World record with his Family Day Cruiser boat Please see ( GN  record on the U tube page ) I had him work on my 1984 Eliminator V drive 3 speed auto C-500 prop he flipped the boat and Bob his father sold the business after son Dave broke his hip that day and was in wheel chair BTW feel the pain on ( lean ) carb syndrome. FSTSIX

   BTW this is( PG )  language ( see UTUBE Connally boats ) Lots of blown boats.

[pvan]

Hey fst6 I run N20 on a few toys and I always go wet and always run a second fuel pump. Not for my Valk but on high N20 applications I run programmable controllers that progressively add N20 and retard timing.   
My Valk system is a Edelbrock made for a Harley about $800 with a polished 1lb bottle... not including the Holley pump and the purge valve about $100 each, and I now have the 40hp jet in it. I love the purge valve and have more fun with this and seldom even use the N20. Below is pic of the plumbing.
At bike nights people  love the blower and go bonkers when they see the purge. PS it ain't about penis size for me... I am 6'5" 240lbs with big feet and xxl hands!,lol



http://vrcc.photostash.com/vrcc_25850/MVC-029S.JPG

[fstsix]

Thanks PVAN . you must have located your nozzle"s about the bend in the J tube by the carb. That is the same NOS pump i been using for years for my carb. works good. Any thoughts on total HP ?