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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Last go at this carb... /cgi-bin/YaBB.pl?num=1595699187 Message started by Acidrich on 07/25/20 at 10:46:27 |
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Title: Last go at this carb... Post by Acidrich on 07/25/20 at 10:46:27 Ok, last attempt with this carb before I admit defeat and convert to VM36. Thought I had it nailed but it’s only happy at 2000 rpm tickover....it never seems to stay constant so I’m wondering if the carb is just worn? Persistent backfire between gear changes and a proper one when it shuts down but better with more revs. Foam filter Long fishtail pipe(I know this won’t help[ch128513]) No white spacer 160 main 57.5 pilot( it’s always had this) My thinking is it’s lean at idle but the pilot jet and spacer removed say otherwise? [ch128556] |
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Title: Re: Last go at this carb... Post by LANCER on 07/25/20 at 11:27:53 You’re running rich. Reset your carb with 52.5/152.5/1/2 spacer and your pilot screw at 1.5 turns out. If your engine and carb are functioning properly your engine will start and run with this combo . Is your fishtail an open muffler ? Are the 2 connections in your exhaust leak free ? Check by passing a candle or carbon based substance that is smoldering by the connections when the bike is running and see if the smoke is disturbed, and if so fix the leak. Go for check ride of at least 5 miles to get the engine good and warm and then tune carb. |
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Title: Re: Last go at this carb... Post by Acidrich on 07/25/20 at 12:04:38 Thanks for the reply. No leaks in the exhaust but I’ll check again. It’s an 86 engine and is supposed to have a 155 main and 47.5 pilot I think. With a 155 in it would not rev out in any gear. Too rich on the pilot would cause a backfire? I was wondering if it was unburnt fuel..... Assuming I’d done the exhaust and filter from standard where would you start?.....as I need a baseline. Has anyone fitted the VM36 kit from Murrays Carbs? If it’s plug and play it’s at least a back up plan. Cheers Rich |
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Title: Re: Last go at this carb... Post by Gary_in_NJ on 07/25/20 at 16:28:26 Wow are you running rich, Rich, especially on the needle (where you likely do 80-90% of your riding). Get a couple of #40 stainless steel washers under that needle and your jetting will be mostly there. Reduce the pilot to a 50-52 and the main to a 150-152 and you’ll be there. |
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Title: Re: Last go at this carb... Post by norm92de on 07/25/20 at 19:55:58 On top of the needle! |
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Title: Re: Last go at this carb... Post by zipidachimp on 07/25/20 at 23:14:47 Lancer's carb specs are right on the money, esp at sea level. Idles smoothly at 1200 with no stalling, quick pickup when the light goes green! Cheers! 8-) |
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Title: Re: Last go at this carb... Post by LANCER on 07/26/20 at 05:48:01 With an ‘86 carb try a #50 pilot first, I didn’t catch that at initially. Does your needle have 3 needle clip grooves in the top of it ? If so, put your plastic spacer Back in and set the clip on the middle groove. Use the 152.5 main jet for now but don’t worry about it for the time being, focus on getting the pilot circuit sorted out first. After that recheck the needle for accuracy. Then do the main jet. All three continue to feed fuel all the way to wide open throttle. With a too rich condition over all, as you get to wide open throttle your main jet circuit can be extremely rich and the result is a drowning main jet. It is really sluggish. Doesn’t run worth a crap. Backfires can happen with either too lean or too rich. Both can leave excess fuel in the pipe. I don’t know Murray Carbs, which VM36 are they using ? There is more than one, and if the wrong one you will need to change pilot, main, needle jet, jet needle, which will cost as much as the carb itself, so about double. The base Carb kit with everything you need for a complete carb swap is $399, nothing else needed. If you already have a VM36 tell me what pilot, main, jet needle, needle jet, and I will tell you if you have the correct carb. Where are you located ? |
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Title: Re: Last go at this carb... Post by LANCER on 07/26/20 at 05:51:50 6D676369626B6F66383E3A0A0 wrote:
Gary, Mikuni does not make a #62 Pilot, they run ... 50/52.5/55/57.5/60/62.5/65 ... |
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Title: Re: Last go at this carb... Post by Gary_in_NJ on 07/26/20 at 06:36:57 Typo. I corrected it |
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Title: Re: Last go at this carb... Post by Acidrich on 07/26/20 at 06:52:37 Cheers chaps, I’ll start at Lancers settings and see what happens. There’s no such thing as a no4 washer in the UK so how many washers = the white spacer? Cheers Rich :) |
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Title: Re: Last go at this carb... Post by norm92de on 07/26/20 at 07:19:39 The white spacer is .110' you need about half that in washers. I run mine on a shaved down spacer .075". I'm also at 4000' elevation. Hope this helps. By the way, Mikuni slots are .035"/ .9MM apart if you have any slots. |
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Title: Re: Last go at this carb... Post by LANCER on 07/26/20 at 08:23:31 You can just file the white plastic down half way and get the same result if getting washers is a hassle. Set the spacer on a sheet of sand paper and use a finger to rub back & forth until it’s 1/2 of original thickness. Install. |
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Title: Re: Last go at this carb... Post by verslagen1 on 07/26/20 at 09:26:15 74565C51475C565D350 wrote:
A #4 washer is .032" (.8mm) thick and .313" (8mm) OD Might be an M3 |
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Title: Re: Last go at this carb... Post by Acidrich on 07/26/20 at 10:00:55 Thanks for the info chaps, I’ll get on it and keep you posted. :) I asked on Facetube but any UK members on here know the best place to order the jets from? Rich |
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