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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Adventures in carb land /cgi-bin/YaBB.pl?num=1238421295 Message started by Mortation on 03/30/09 at 06:54:55 |
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Title: Adventures in carb land Post by Mortation on 03/30/09 at 06:54:55 Well Sunday I decided I would install the jets I got. My bike is an 88 LS650, stock airbox and harley muffler. I think the baffle may be missing from the harley (never had a harley muffle before). I can look right through it. Seems to have some mesh stuff around the inside walls. Taking the carb off was a real PITA, had to remove the whole battery box to get enough room to pull it back and out. Once the carb was apart I realized it was a miracle the bike ran as well as it did. There was junk and gunk everywhere. Horrible, I should have taken pictures. Anyway what was going to be a simple rejet turned into a strip and dip. I had to it was wicked nasty :( On re-assembly I went with a #55 pilot, a #155 main, and three washers (in place of the white spacer). Put it all back together and the bike wouldnt run for crud. Had to hold the throttle open to get some wretched running. I shut it off and dropped the bike, literally lol. The kickstand wasnt down :P I head back inside and flip through the manual to figure out where I went wrong. WHOOPS! I put the diaphragm on the side in wrong! I went cover, diaphragm, spring. It was supposed to be cover, spring, diaphragm :( I ran outside, swapped it around and the bike sounded much better. It was late so I couldnt mess with it much more and went inside. This morning I adjusted the mixture screw and rode the bike to work. Sounds better, I think it may be rich, needs some tuning. I have almost no popping and good throttle response but idle isnt the best. I am having one little problem. Bike wont run on "on" only "Pri", I put on all new fuel, vacuum lines. I checked them and they look ok. If I put it on "on" the bike sounds like it is not getting any gas and then dies out. Any ideas? |
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Title: Re: Adventures in carb land Post by diamond jim on 03/30/09 at 07:14:30 Asssuming the petcock is fine, it sounds like your vacuum line is leaking. Either a hole along the hose or a crack on the end. Dirt and grime was probably keeing it sealed and moving/cleaning the hose opened it up. Get a new one. But to test it you could pull it, wrap the last inch on each end with electical tape, rub vaseline into the rubber really good to seal any pinholes, wipe it off and try it again. Did the new #55 pilot jet have little bleed holes? Yes, your muffler has had the baffle plate removed. |
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Title: Re: Adventures in carb land Post by Mortation on 03/30/09 at 07:27:48 272A222E2C2D27292A2E430 wrote:
I put all new lines on including vacuum when I put it back on. I think I will pull it off the gas tank and put my thumb over the end to see if I am getting any suction. 272A222E2C2D27292A2E430 wrote:
Hmmm, not sure. I got them from Lancer. 272A222E2C2D27292A2E430 wrote:
Yea thats what I figured. Thanks! |
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Title: Re: Adventures in carb land Post by diamond jim on 03/30/09 at 07:33:37 Did the new line fit the nipples suggly? I ask cause I hade gotten some new line last week to change mine out and it fit but was not quite as snug as the stock line. My stock line is back on til I can find some better fitting line. Next freebie is to tighten the 4 screws on the back plate of the petcock. This has helped some members. |
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Title: Re: Adventures in carb land Post by Mortation on 03/30/09 at 07:49:16 5459515D5F5E545A595D300 wrote:
Hmmm good call on that one. Its clamped nicely at the carb but not at the tank cause there is no friggin room. I will check that out tonight thanks. The tank is the worst design for these bikes ever. Its to small it doesnt hold enough gas and its a real PITA to get off and on :( 5459515D5F5E545A595D300 wrote:
Cant hurt to give it a whirl if the clamp doesnt solve the problem. Thanks! |
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Title: Re: Adventures in carb land Post by verslagen1 on 03/30/09 at 07:58:21 Thanks for not taking pictures of horrifying creeping crud. ;D You might need hose clamps, tie wraps work. Also, if the carb was that bad, maybe the petcock is full of crud too. Remember, the diaphram is not a replaceable item, be very gentile. |
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Title: Re: Adventures in carb land Post by Mortation on 03/30/09 at 08:03:41 7D6E7978676A6C6E653A0B0 wrote:
Yea I am going to give that a shot tonight. Or maybe I will run to the hardware store on my lunch break and see if I can add a clamp without moving the tank. I checked on the Diaphragm and they are both still available, 35.74 for the little side one and 89.37 for the big one. Or were you talking about a different one? |
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Title: Re: Adventures in carb land Post by verslagen1 on 03/30/09 at 08:25:50 7C7E63657065787E7F110 wrote:
diaphram in petcock |
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Title: Re: Adventures in carb land Post by Mortation on 03/30/09 at 08:47:27 293A2D2C333E383A316E5F0 wrote:
diaphram in petcock[/quote] Ahh yes true. But now that I looked into it for $60 I may just swap it out for a new one if I cant get the clamp to solve the problem. I can run on Pri for a couple weeks till I can spare $60 :) |
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Title: Re: Adventures in carb land Post by Max_Morley on 03/30/09 at 09:12:07 Any chance you have switched an overflow vac line with the one on the manifold? Valve wouldn't work if that happened. As I recollect they are the same size and unless you still have the original line with a wound wire cover they would be easily confused. Max |
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Title: Re: Adventures in carb land Post by Mortation on 03/30/09 at 09:14:07 48647D5A486A7769607C050 wrote:
Good thought but nope. They are all connected properly, I double checked them. I am thinking Jim is right about it not being sealed so I am going to try that first. |
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Title: Re: Adventures in carb land Post by marine5317 on 03/30/09 at 18:05:15 Hope this helps. Mine is an 07 and I got my jet kit from Lancer. I got rid of the white spacer and used the 3 little washers from the kit. Here is where I made my mistake. I OVER-JETTED! I talked with Lancer and he told me to go back to the oringal pilot and down to the#150 main. I follwed his instructions and it runs perfect. I stay up at 60-62 mpg. And like you I am running a H/D Dyna muffler Ride Safe Marine 5317 |
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Title: Re: Adventures in carb land Post by diamond jim on 03/30/09 at 19:26:34 Speaking of over-jetted, I went back to my 52.5 pilot. I was running a 55 pilot with bleed holes. It seemed too rich. But the 52.5, although it seems to idle and decel better, it also brings the backfire back. I mentioned a few times here about trying a 55 with no bleed holes. I've been having trouble finding one that I was "certain" would work. I can find them for Mikuni carbs but they are always listed for VM carbs. Will those work in our CV carbs? |
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Title: Re: Adventures in carb land Post by LANCER on 03/31/09 at 04:46:26 5B565E5250515B5556523F0 wrote:
A #55 pilot jet for a VM carb will flow more fuel than a #55 pilot jet made for the stock CV carb. A while back I accidently put some of the VM pilots in the JETSETS and caused a bunch of folks problems with tuning their engines. It is now quite apparent that many people are having difficulty in figuring out whether to use a #52.5 or #55 pilot, since many engines seem to be on the proverbial fence between the two. Because of that I have started to include a new #52.5 pilot in the JETSET to help make the tuning job a little easier. Having new jets on both sides of that fence makes for a more level playing field. It is possible and not uncommon to find that an engine will need the pilot air adjusting screw set at 2-2.5 turns out with the #52.5 pilot, while it needs only .5-1 turn out with the #55 pilot. It is possible to have equivalent fuel flow from both setups and good engine operation. Of course, for correct tuning it is necessary for all passageways in the carb to be clear and functional, otherwise correct tuning is impossible. |
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Title: Re: Adventures in carb land Post by diamond jim on 03/31/09 at 05:20:40 Yep, that's exactly what I experienced- pilot air adjusting screw set at 2-2.5 turns out with the #52.5 pilot (occasional light decel backfire still present), while it needs only .5-1 turn out with the #55 pilot (just a tad too rich at idle). Lancer, do you have any #55 jets for the stock carb with no bleed holes? PM and I'll paypal you. |
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Title: Re: Adventures in carb land Post by LANCER on 03/31/09 at 06:34:58 7E737B7775747E7073771A0 wrote:
I only have the holy ones on hand, but will order some stock type next time |
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Title: Re: Adventures in carb land Post by Mortation on 03/31/09 at 06:48:32 I did get a #52.5 but went with the #55 with the mixture screw 1 turn out. I had it 1.5 but that was to much. I went with a #55/#155 combo because my pipes are almost straight pipes with the harley baffle gone and I would rather have some gurgle on decel then POP POP lol. Seems to run rich but good on my current setup. Have not trashed the plug yet but I will have to keep an eye on things. As to the OP I clamped down both ends of the vac line and its better but still doesnt seem like its getting enough fuel. It runs and stays running now on "on" but still seems to run better on "PRI". The hose is a little to big on the I.D. as Jim thought. This problem may have been original and not related to the carb, could be petcock issues. |
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