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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Need some carburetor input... /cgi-bin/YaBB.pl?num=1422496976 Message started by Skiprrdog on 01/28/15 at 18:02:56 |
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Title: Need some carburetor input... Post by Skiprrdog on 01/28/15 at 18:02:56 Well, I got her running today...sort of. Put the verslavy mod on today, checked the valves again, put on my new dyna muffler. Lastly I took the jetset I got from Lancer, put in a 152.5 main and a 52.5 pilot jet. She started up, but mostly ran like *ass*. The only way it would stay running was to keep the enrichener knob pulled all the way out. If I tried to push the knob in, either one click or two and it would die instantly. When I had it running, adjusting the air/fuel mixture screw had no effect. I am not real knowledgeable with carbs, so am I correct in assuming that since it runs with the knob all the way out, but dies otherwise, that I should bump up the pilot jet size? :P |
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Title: Re: Need some carburetor input... Post by 1st2know on 01/28/15 at 18:14:20 Can you get the bike to warm up? Turning the pilot screw on a cold engine is not going to give you good feedback - warm it up first. 52.5 is the stock jet for '97 on up - I don't think you have a jet issue(yet) - turn it out 2 1/2 times and then try to warm it up. Also, get a candle and inspect your exhaust for leaks. |
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Title: Re: Need some carburetor input... Post by Gary_in_NJ on 01/28/15 at 18:22:05 Make sure that the float isn't hung up. It should move freely for the full range. |
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Title: Re: Need some carburetor input... Post by verslagen1 on 01/28/15 at 19:59:46 546C6E777575636860070 wrote:
6E56544D4F4F59525A3D0 wrote:
people need to know the history if they are to help. |
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Title: Re: Need some carburetor input... Post by verslagen1 on 01/28/15 at 20:04:20 You didn't say if it was a stock air filter or not, and about the muff... is it loud or normal? If you're putting on a pod filter it may need richer jetting. Same with a loud dyna, if it's had the baffle punched out it won't have any back pressure. stock air filter with a stock dyna won't need too much more than stock jetting. |
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Title: Re: Need some carburetor input... Post by justin_o_guy2 on 01/28/15 at 20:32:14 I've seen old gas act like that. |
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Title: Re: Need some carburetor input... Post by Serowbot on 01/28/15 at 21:32:47 I'm running a #50/150 pilot/main, 2/3 spacer... with a stock airbox and K/N slip-in, and a Harley Shorty with baffles intact... So,.. I don't think you're lean... Is your idle speed high enough?... ...(if it runs on choke,... there must be an idle speed setting that keeps it running, even if it requires a ridiculous rpm to maintain)... Idle speed adjustment is the knurled screw on the left, near the choke pull.... CW is higher,... |
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Title: Re: Need some carburetor input... Post by Gary_in_NJ on 01/29/15 at 05:11:18 7D6264637E7948784870626E25170 wrote:
+1. However the new jets should be able to pass pancake syrup. |
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Title: Re: Need some carburetor input... Post by verslagen1 on 01/29/15 at 07:30:42 33393D373C353138666064540 wrote:
+1. However the new jets should be able to pass pancake syrup. [/quote] It may be able to pass it, but don't expect it to run. |
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Title: Re: Need some carburetor input... Post by Serowbot on 01/29/15 at 07:57:50 "Pancake syrup"... ;D ;D ;D ;D ;D ;D ;D ;D ;D.... Good one, Gary... ;)... |
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Title: Re: Need some carburetor input... Post by justin_o_guy2 on 01/29/15 at 08:17:47 Gas is cheap,, if you have any doubts about it being fresh, dump it, drain the carb bowl, start over. |
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Title: Re: Need some carburetor input... Post by Skiprrdog on 01/29/15 at 10:06:22 Thanks for the replies, everybody. Pancake syrup aside (you guys are making me hungry...what were we talking about? ::)) The bike is bone stock, except for the dyna muffler I just put on, which still has the baffles, and it has a new, stock air filter. Gas is less than a week old. When I got the bike, it had 145 main jet and 52.5 pilot. I cleaned the carb no less than four times; Pinesol soak, Gunk soak, carb cleaner and compressed air, then several cycles in the ultrasonic cleaner. Put new float needle and seat in it. Valves adjusted, new oil and filter. I looked at the plug from the short run yesterday and the end was kind of a light grey. This morning I took the carb off again, the float is free. I left the new 150 main jet in it and swapped out the pilot for a size 55. And I took out the big white washer on the jet needle and put on the three small metal ones that Lancer sent. This morning I was able to start it and let it idle, but only with the idle adjustment screw cranked all the way in. And still, trying multiple settings on the air fuel mixture from all the way in to 3 1/2 turns out did not seem to have an appreciable effect. Like I said, I was able to let it idle for close to ten minutes, throttle cracks would rev the engine fine, no hesitations or bogging, but some popping when it came back down. One thing I should mention, not sure if it is a problem, but on my original carb dip, when I went to the store, I bought some no-name instead of the Pinesol brand; compared the ingredients and they seemed to be the same. When I took it out of the dip, it had turned the carb body a very dark, and sort of chalky grey, hence all the subsequent cleanings. I don't *think* it is a problem, but it definitely changed the way the outside of the carb looks. I did a quick video of it running this morning...Ill see if I can get it on 'you boob' later... |
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Title: Re: Need some carburetor input... Post by Dave on 01/29/15 at 10:28:16 If the bike is working at higher throttle settings....It seems like you have an issue with your idle circuit...for some reason it is not getting the proper amount of fuel at idle. If you remove the pilot jet and blow carb cleaner in the hole....the carb cleaner should come out of the hole on the other side of the butterfly, and also out the hole where the idle fuel mixture screw is. Lots of cleaners can react with the aluminum....and if you read the labels some do warn they are not for use on aluminum. I never soak the carb in any cleaners.....10 minutes in the ultasonic cleaner and the carb comes out and gets blown out with compressed air and dried. |
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Title: Re: Need some carburetor input... Post by Steve H on 01/29/15 at 17:55:19 Idle adjustment screw all the way in tells me that you are cutting the fuel flow as much as possible at idle. I am assuming that our idle adjustment is a fuel metering screw instead of air metering. If this is true, I'd say the pilot is too big. If I'm backwards and the screw is air metering, then the jet is too small or blocked somehow. |
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Title: Re: Need some carburetor input... Post by Skiprrdog on 01/29/15 at 20:17:14 Yeah, I am not sure. Tomorrow I am going to take Daves suggestion and take the carb off and blow some carb cleaner thru the pilot passages. I may even try putting back in both of the original jets and see what that looks like. I put a short video on you tube of it running (and popping) this morning if anyone wants to see what I am talking about... https://www.youtube.com/watch?v=bCCPYSefeuI&feature=youtu.be |
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Title: Re: Need some carburetor input... Post by Serowbot on 01/29/15 at 21:09:07 Sounds pretty good... although I think I'm hearing a few misses... Steve's right,.. no response on the mix screw points to rich on the pilot... ...(mine don't respond to mix much either and I have a #50 pilot with a K/N filter... we are up pretty high here in Tucson-at 2800ft)... The popping sounds like an air leak in the exhaust... Idle speed sounds good... Don't idle longer than 10 minutes.... I'd keep it under 3... (it's air cooled, and it don't move a lot of oil at idle)... |
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Title: Re: Need some carburetor input... Post by Gary_in_NJ on 01/30/15 at 05:04:24 What is the condition of the rubber boot between the carb and the cylinder head? A slight fold or a tear will cause popping and misfiring. |
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Title: Re: Need some carburetor input... Post by Skiprrdog on 01/30/15 at 08:06:09 Yeah, Im hearing the misses too. Also, there is a good chance it has an exhaust leak. The PO was a duct tape and JB Weld kind of mechanic(I think he must have gotten the JB Weld in bulk at Costco ;D) When I had the exhaust off to put the verslavy in it, I noticed at the exhaust port what seems to be a large quantity of JB Weld on the head, underneath where the header pipe goes in; and the clamp for the pipe was mildly bent into a curved shape, but despite that, it all bolted on solid. Cant even imagine what the JB weld on the head is for, but due to the high mileage (51K) I have resigned myself to doing a top end sooner than later. Tucson, huh? I am actually in Marana, but we like to think of it as North Tucson here ::) Gary, the two boots on either side of the carb are in excellent condition...I should know, because I have had the carb on and off enough lately ::) Although compared to the Kawasaki KZ1000 I have also been having carb issues with, the carb on the Thumper is a walk in the park :P |
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Title: Re: Need some carburetor input... Post by Dave on 01/30/15 at 08:28:50 4971736A68687E757D1A0 wrote:
It sounds like the previous owner has attempted to solve a head plug leak...by jamming JB Weld in the bottom of the plug. |
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Title: Re: Need some carburetor input... Post by Skiprrdog on 01/30/15 at 10:07:16 58636E7968647F79626A67780B0 wrote:
It sounds like the previous owner has attempted to solve a head plug leak...by jamming JB Weld in the bottom of the plug.[/quote] Dave, you are probably correct. If that is the case, he must have succeeded, because it does not seem to be leaking. Will probably leave the correct fix for that when I do a top end, bigger fish to fry right now! |
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