| Author | Message | ||
     Mob_industriescom |
I just picked up a 02 for a starter bike for the g/f. When I picked the bike up from the guy it ran like a champ, the guy pulled it out of storage after 3 years, put a batt in the thing and it ran great around the parking lot and down the road.. I said sold!! After riding around in the back of the truck for a few days we decided to get the gf on the bike. It started right up like always but for some reason I couldn’t get the thing to rev up.. I took it apart pulled the bowl off the bottom and cleaned a little gunk from the bottom and blew out the main jet thinking that was goin to do the trick.. But still the same prob.. idle fine but couldn’t rev it up.. So I sprayed some starting fluid in it and it will rev right up.. So I haven’t had the carb off again after this, but im thinking I have a crack in my rubber carb boot and its just leaning the bike out, or its this auto enrichner deal.. I read a few posts that if I unplug it that the bike will run granted once it is warmed up.. Any thoughts on this would be greatly appreciated before I go out and buy that auto choke deal.. | ||
| 2hrcommute |
That was me and my 02 two weeks ago. THE BOOT!!! It's only 11 bucks. Go here and read Gearheaderiko's post to me http://www.badweatherbikers.com/cgibin/discus/show .cgi?20164/6812 This is the carb section and will also help. | ||
| Swampy |
Welcome to the Thumper Forum Mobindustriescom! Watch out on using the starter fluid, that stuff is pretty volitale and cand remove piston ring lands... You said you took the carb apart and found gunk in it, were you able to check the primary jet? Also for all around good running on a Blast you can run a 148 primary jet and 170 main jet. Then drill the idle are adjustment screw plug out of the carb body so you can get to the idle air adjustment screw. Make sure your fuel line is flowing a good stream of fuel from the line when it is turned on. Good luck. I am going to be working at the Ralph Macmullen confrence center on Monday up on the north end of the lake. | ||
| Tnthumper |
Mob, You say it sat for 3 years? Try draining the tank and putting fresh gas in it. if you have one put it in a clear jug to check the gas you remove. I say this because mine sat 8 months while I was deployed and when I got back it gave me alot of trouble until I drained tank filled with fresh gas and ran several bottles of iso heet and ran it on reserve setting for almost 100 miles to finally clean out the tank. Just a thought as something beyond das boot. John | ||
| Mob_industriescom |
Ya i drained the tank, it looks as if when it was in the back of the truck for a few days, it also rained and the gas looks pretty milky... I drained it all and put fresh in and made sure none of the lines were clogged, air seems to flow all the way through the lines into the carb.. Pulled the slow jet nothing in there.. The boot looks fine, clicks back into place when i put it on "seems" to seal fine.. But still the same prob.. Will idle all day long, i can put my hand on the back of the carb to act as a choke and it can get the motor to rev up.. Somehow its starvin for gas.. It did sit for a 3 years, but when i picked the bike up i rode the thing for a mile or 2 and ran like a little champ.. | ||
| Tnthumper |
Mob, yeah that sounds a bit like what mine was doing. i suggest getting something like the isoheet and running a full bottle in it every time you fill up. It may still have some residual film or something from the old gas going bad that will need to have worked out.The isoheet worked pretty good for me.mine was starting fine but then would idle fine then spit and sputter when i tried to give throttle similar to what ur describing. Hopefully you can get it worked out soon. John | ||
| Ezblast |
Give the float a few gentle taps - may be stuck from sitting in one position too long with dirt/gunk holding it in place - happens. EZ | ||
| Mob_industriescom |
Im about to send this thing to the scrap yard or the dealership… haha I took off the tank, flushed it all out a few times with fresh gas. Then I took off the cast intake manifold, put the boot on the carb then onto the intake and bolted it back on(made SURE of a solid seal).. Same thing.. Spit sputter, but as soon as I put my hand on the back I can get the thing to rev up... Main and slow jet all check, looks like a 43 on the slow.. I didn’t mess w/ that idle screw.. Could that be it???? I just wasn’t sure how many turns that has to be out??? Anyways I appreciate the advice | ||
| Ezblast |
2 1/2 turns out. Replace boot. Could be O-ring on intake, or bad slide as well - it has been sitting. You definitely have a vacuum leak. EZ | ||
| Gearheaderiko |
You definitely have a vacuum leak. Concur! What we know: It ran fine when you test rode it. The tank got contaminated with water before you rode it again and after that it wont rev up. It will rev up if the carb throat is covered (serious vacuum leak). There was silicone present at carb boot. "Das Boot" has been replaced. Slow jet appears to be clean, but it has not been replaced. So..... Could be O-ring on intake: Possible, but not common. Was there silicone around the intake manifold to head mating? Have you done the WD40 test (sprayed around possible intake leak areas). Unplugged carb vacuum line on top of carb (near boot): This usually only causes poor running. But it is a vacuum leak so check it. All CA bikes have this vacuum port. Non CA Blasts may or may not have the vacuum port. Sometimes the nipple is there, but its not hollow. The rubber caps frequently become hard and split. Improper carb reassembly (no offense): Things to look for is a pinched, damaged or unseated diaphragm (attached to the slide/piston). Vacuum spring missing? Needle not correctly fitted (no shims were added?) Or it doesnt have a stock needle and the clip has come off? Idle mixture screw is missing o-ring (should have o-ring, spring and washer). Needle jet is missing. This is a small piece that the needle fits (passes through) into if you look into the mouth of the carb. They can fall out and are easily overlooked. They can often fall out if the "needle jet holder" (emulsion tube) comes out with the main jet. Or? Less common causes (or very rare) is a cracked intake manifold, cracked cylinder head and even very low compression. But we have to work on the assumption that it ran just fine when you picked the bike up and something happened between that time and when you went to ride it after bringing it home. So that rules out the major items due to wear or abuse. PS Please change the slow jet to a #45. Its $6 at the local HD dealer (or many aftermarket places) and greatly improves the rideability of the Blast. Its not a performance part, but gets the engine away from the EPA mandated super lean idle. | ||
| Ezblast |
Concur! |
