| Author | Message | ||
     Gearheaderiko |
I dont think its in there. I remember looking all over for it (just did now too) and I dont remember if I found ever it. Your not supposed to take it off anyhow. I dont think there's a picture in the manual with it off!.  Does the Uly use the same type of O-ring seal? | ||
| Swampy |
I just had that out on the Yellow Blast. I think I torqued it too........ Um...... I think I had the inch pound torque wrench out to like 27 ft. lbs Just tight. | ||
| 08uly |
"Does the Uly use the same type of O-ring seal?" Good point, Uly uses something close, not quite the same but looked up the torque for the Uly and it uses 96 to 120 in-lbs. I guesstimated when I put it on and took it to 120 in-lbs...  --- 08Uly Uly Data Page Blast Data Page  | ||
| Edloks1 |
Hello, I'm trying to re-jet my '01 Blast and I can't get the slow jet to drop out of the carb. It turns counter clockwise just fine, but it won't drop down. its not stripped. When I turn it clockwise it tightens back up to original position. Any tips on removal? | ||
| Reuel |
Maybe a piece of gum on a screwdriver? Kidding! Don't do that! It'll dissolve in gasoline and become a nightmare! Try spinning the screwdriver quickly between thumb and finger and see if you can dislodge it that way. | ||
| Swampy |
Welcome to the Thumper Forum Edloks1! Are you removing the idle air adjustment screw or the primary jet? If it is the idle air adjustment screw, there is a packing around the screw to help seal the threads, which will hold the screw inplace along the needle portion of the screw. Once you get it loose, try blowing some compressed air in to the bleed hole in the opening of the carburetor to push the screw out past the packing. | ||
| Edloks1 |
Its the primary jet. It unscrews, but it wont fall out. it seems like the treads are catching the wall cause it will jiggle, but wont drop out. maybe ill try some super glue on the screwdriver head.... | ||
| Swampy |
Spray some carburetor cleaner in the hole, and you can also try some compressed air still. Make sure the screw driver you are using does not scratch up the sides of the primary well where the jet goes, that is probably what happened.......or you have a REALLY dirty carburetor! | ||
| Edloks1 |
I finally got the primary jet out! I put some superglue on the tip of my screw driver and held it in there for a couple minutes...then the jet came right out! Thanks for the advice guys. The bike is way more fun with ez's air box mod w/ K&N and 45/175 jets. I also shimmed the needle about 0.05". By the way, my exhaust is stock...is 175 main jet too much? I've got the idle screw at around 3 turns out and it seems to have a little flat spot...any tips? | ||
| Andymnelson |
Need some carb help! My girlfriends Blast has a Vance and Hines exhaust, and a custom intake with K&N filter. I just installed the filter, and installed new jets at the same time (48 and a 175, also have a 180). Here's where things went wrong.... When removing the main jet, the needle jet holder/ tube came out with it. It took some doing to remove the jet from the tube, but I got it. When re-installing the needle jet tube, I torqued to too much, and the soft brass it is made of warped the tube. I have a good parts guy at my local dealer, and her got me a new needle jet holder, and just for good measure I replaced the needle jet and the jet needle (in case I bent up either of those also). It is all back together and runs great as long as you keep it under 1/4 throttle! As soon as you crack the throttle a bit, it falls on its face and is clearly running far far too lean. It feels as tho the primary jet isn't even opening. I have torn the carb down again, and made sure that the diaphragm is seated properly, and that the slide moves freely, with slight pressure when pushing up and a springed return. You can hear the air flow when pushing on the slide, It all seems ok. I also have inspected the carb boot and it looks good, and I WD40d it when running and no change in idle speed. What the heck am I missing?? Where do I go form here? We're coming up on our last riding days here in MN, and she'll kill me if I don't get it running soon! Thanks in advance. | ||
| Ezblast |
Actually sounds as if your intake isn't giving you enough air - have you tried it sans filter? EZ | ||
| Andymnelson |
yeah. tried no filter, tried with needle shimmed and not shimmed as well. I'm a bit stumped. how mush pressure should it take to manually move the slide up? | ||
| Ezblast |
Is the float allowing enough fuel in? Make sure your vacuum line is plugged well also. EZ | ||
| Andymnelson |
I think the float is good. I had the carb off and set it. also the bowl is full every time I've removed it... vaccum line is plugged. I thought it felt like vaccum also (not opening the slide/primary), but I don't see a place where it could leak other than the 1 line? | ||
| Andymnelson |
 | ||
| Ezblast |
Das Boot? | ||
| Andymnelson |
I doubt it- I removed and carefully inspected it. Seems good with no cracks. Soft rubber. When reinstalled, I soaked it with WD40 while idling and no change in idle rpm. But maybe? Is there a better test for it? | ||
| Gearheaderiko |
The boot is not that critical (relatively speaking). It'll still run with a big crack in it and you've inspected yours with no visible damage. It wont usually cause it to stop at 1/4 throttle if it looks that good. Would seem obvious you messed up the carb somehow. Perhaps the dealer gave you the wrong parts. Maybe someone already installed a non-stock jet kit and you've got the wrong parts. Possible you left off a clip somewhere. Nothing comes readily to mind that you havent already checked. Have you messed with the timing or the TSP? Does your XB have a carb or is it injected? If its got a carb, then..... | ||
| Andymnelson |
"Would seem obvious you messed up the carb somehow." I agree, but these carbs are so stinkin simple and I can't figure out what! The new needle jet, needle jet holder and jet needle are from an 883 sportster motor- same part numbers as the Blast parts, i already checked the numbers. Everything went back together nice and smooth. The jets did appear to be stock (had stock stampings on them). I have never touched the timing or TPS on this bike. My XB is fuel injected (which is awesome- I would be able to fix this issue in a heartbeat with my laptop and ECMSpy if this was my XB!). I'll tear the whole carb down again tomorrow and check everything one more time. It shouldn't be so difficult on such a simple carb. I've spent years working on Demon carbs on my musclecars and jeep- those are WAY more complicated than this thing is! Shoot out any other ideas you all might have- I'm willing to try anything at this point! Thanks again for your input. | ||
| Swampy |
Did you have the diaphragm cover off? If you did you may have pinched the diaphragm just slightly under the cover. When you get the diaphragm pinched it displays that type of behavior. | ||
| Ezblast |
Concur | ||
| Andymnelson |
Well I fixed it tonight. Long story that I'll type out later and show some pics... Thanks for the input (it was none of the suggested things, by the way), I really appreciate a community willing to offer up the knowledge it has and willing to help a fellow rider. Thanks for supporting and getting me thinking! More to come... | ||
| Andymnelson |
Ok, so long story short...I decided to fabricate my own intake. Aluminum ring, elbow, K&N filter...seems simple enough. I made sure that all things such as the vacuum port and both slow and main circuit vents were clear and had no obstructions. The aluminum ring made had the inner diameter of the inner diameter of the carb. The elbow used inserts into the ring however, narrowing that passage. I notched the elbow around the vents and vacuum port so that there was an unobstructed air path to both. The problem comes with the vacuum port. This is the port I speak of:  This port requires air to be "force-fed" into it. It uses the vacuum created by the engine sucking air into itself and hijacks that air. This air being forced up under the diaphragm is what raises the jet needle and allows more fuel to flow. I did not have a clear path to it, so it was not able to take advantage of the flowing air/vacuum. Rather than re-create my entire intake design, I simply fabricated a little air foil that mounts inside the elbow and directs air into the vacuum port. Problem solved! The bike runs great- it's mostly stock as far as the motor goes: Vance and Hines exhaust, my intake, 45 and 180 jets. I've done a few other things to the bike, as you may be able to identify by these pics of my setup. Happy Blasting!   | ||
| Ezblast |
Do a search for Force Intakes in the Thumper KV and you find a before and after picture for curing that very problem. EZ | ||
| Andymnelson |
EZ- I couldn't figure out how to search just the KV...probably my only real complaint about this site is the primitive search engines... Is this the post you referred to? http://www.badweatherbikers.com/buell/messages/201 64/20510.html?1049398387 If yes, different issues. I'm referring to the vacuum port at the top of the carb, this post refers to the float bowl vent which is just a vent and does not require are forced into it. | ||
| Ezblast |
http://www.badweatherbikers.com/cgibin/discus/show .cgi?tpc=20164&post=159714#POST159714 I was referring to this, however, I see what your saying now - perhaps a spacer would have helped instead? EZ | ||
| Ezblast |
By the way - the bike looks great! How about a few pics in the picture section for posterity? EZ | ||
| Andymnelson |
Yeah...same post, I just didn't know how to link directly to the post, just the page :-p I though about the spacer, but didn't want to put the elbow into the knee more, and I don't think it would have really helped the issue because I had a notch that allowed free air flow into the vacuum port, just not direct air being forced into it...not sure if that makes any sense :-p Thanks for the compliments too- I will definitely post some pics (taken with a better camera tho!) one I get a little closer to being done. I got the dual headlights done, the Lightning front end mounted...just need to replace my graphics with dark red ones and get the wheels powdercoated to match. It will match the translucent red flyscreen. | ||
| Ezblast |
I think thats also why they dremelled out that Force intake - to force more air into that whole area. Yuppers - the bike is looking real good! EZ | ||
| Reuel |
Hey! You have the same ignition cover that I do! |
