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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> running hot, and lean, I think. thoughts? /cgi-bin/YaBB.pl?num=1437876146 Message started by nof1 on 07/25/15 at 19:02:26 |
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Title: running hot, and lean, I think. thoughts? Post by nof1 on 07/25/15 at 19:02:26 I picked up a 2001 with ~2700 miles for my girlfriend. (I already want my own to mod ryca style). The bike was left non running for several years, I'm not sure how many, but at least 2, and based on mileage which I expect is correct never saw real regular use. So I've rebuilt the carbs and replaced the main jet with a 150. Everything seems up to snuff to me, and was cleaned as I went. It's all back together and has been around the block a few times. At first the bike didn't want to idle but I adjusted the float and that helped. It still seems to be running lean and hot. Hot enough to discolor the pipe with just 15-20 minutes or run time, with slow <25 mph jaunts around the neighborhood. It idles a little slow by my ear, and only starts/runs with the choke open. I've keep the engine speed up manually with the throttle, and have the idle speed screw all the way in, for max idle speed. I removed the brass plug and have accessed the air/fuel mix screw and have it set at a middle distance b/w all the way in and out currently. I thought middle ground was a decent place to start. 1st question... does screwing in or out make the mix "rich" I've read several posts here but am still confused. Reference to clockwise/counterclockwise would be appreciated. I'm thinking perhaps the pilot jet or some other part of the carb is somehow still clogged and that's part of the reason it wont idle. thoughts? I'm approx 1K elevation, with stock air box and exhaust. All thoughts/suggestions appreciated before I pull the carb to check it all out again tomorrow. |
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Title: Re: running hot, and lean, I think. thoughts? Post by justin_o_guy2 on 07/25/15 at 19:07:04 What gear is that Under twenty five MPH roll around the block in? t idles a little slow by my ear, and only starts/runs with the choke open. I've keep the engine speed up manually with the throttle, and have the idle speed screw all the way in, for max idle speed. Full in on idle screw? Not normal, it otta be screaming. Look at the petcock troubleshooting steps. I'm not certain about rich ,lean, right ,left on the idle air.. |
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Title: Re: running hot, and lean, I think. thoughts? Post by nof1 on 07/25/15 at 19:11:44 1st and 2nd gear, I may have briefly gotten to 3rd, but didn't stay long. I wasn't wrapping out the engine by any means. Edit.. or lugging it. |
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Title: Re: running hot, and lean, I think. thoughts? Post by justin_o_guy2 on 07/25/15 at 19:14:58 You were lugging it. I Might get into second under twenty five, but I'd probably be just really easing into the gas. If it's discolored , it's hot. You CAN blue the pipe in neutral,racking the gas . Ask how I know,, How is the acceleration Backfires |
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Title: Re: running hot, and lean, I think. thoughts? Post by nof1 on 07/25/15 at 19:16:17 I don't think so, it lugged a bit when I upshifted but I kept the engine speed higher than 1K for sure... well as sure as My ear can be |
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Title: Re: running hot, and lean, I think. thoughts? Post by nof1 on 07/25/15 at 19:18:52 At idle there is little to no difference with changes in the air/fuel mix screw. Obviously I cant adjust it while moving. Maybe some can but not me! ;D I replaced the petcock with a raptor version, as it seemed prudent. It backfires at when backing off the throttle in neutral or while moving. Cutting the throttle rapidly causes an almost immediate backfire. |
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Title: Re: running hot, and lean, I think. thoughts? Post by Dave on 07/25/15 at 19:29:40 If it won't idle, then most likely it is a problem with the pilot circuit. Were you able to look through the pilot jet and see a tiny bit of daylight before you put it back in the bike? My best running was with a #150 main, #50 pilot, and 2 washers on the needle instead of the white spacer. The idle mix screw leans the engine when turned in (clockwise), and richer when turned out (counterclockwise). You should start at a 1.5 turns out setting, then set the screw by adjusting it while idling with the engine warm. Turning the screw out more than 3 turns does nothing additional as the orifice is unrestricted after the needle is out that far. The best running should occur somewhere between 1.5 - 2 turns from lightly seated. If you have to turn the screw in less than 1.5 turns for best running the pilot jet is too big.....more than 3 Here is how you adjust the idle mixture screw.....the engine has to be warmed up and at a somewhat slow idle speed to be able to hear what is happening, you can turn the idle speed back up after you have made the adjustment. https://www.youtube.com/watch?v=zm5mB3R8Ucw |
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Title: Re: running hot, and lean, I think. thoughts? Post by justin_o_guy2 on 07/25/15 at 19:34:36 Be very gentle, the screw tip is fragile. |
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Title: Re: running hot, and lean, I think. thoughts? Post by nof1 on 07/25/15 at 19:35:16 Thanks Dave and Justin! I'll check out the video next and then the idle tomorrow and update. I didn't hold the pilot jet up to the light (wish I had now). Edit: I put the pilot back in without writing down the size. I didn't do the spacer adjust as I only wanted to change one thing at a time. I assume both are still stock, they looked to be untouched to me. |
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Title: Re: running hot, and lean, I think. thoughts? Post by Serowbot on 07/26/15 at 09:42:20 Idle speed is adjusted with the knurled screw on the left, near the choke. Keep idle above 1k... Did you block the vac line with the Raptor switch?... |
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Title: Re: running hot, and lean, I think. thoughts? Post by justin_o_guy2 on 07/26/15 at 09:58:32 I don't remember where the vacuum comes from that raises the slide. |
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Title: Re: running hot, and lean, I think. thoughts? Post by Serowbot on 07/26/15 at 10:50:31 657A7C7B6661506050687A763D0F0 wrote:
da' engine... :-?... |
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Title: Re: running hot, and lean, I think. thoughts? Post by justin_o_guy2 on 07/26/15 at 12:19:19 Yeah, but how is it routed to get on the slide? Might hafta load the CD,, |
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Title: Re: running hot, and lean, I think. thoughts? Post by nof1 on 07/26/15 at 12:42:01 I haven't been able to pull everything off yet so I thought I'd check in before getting to work. After the raptor petcock I capped the vac line inlet to the right side of the carb. I haven't plugged or reattached any vac lines to the engine. Perhaps that's the issue. I thought the vacuum line ran from the stock petcock to the right side of the carb only. Am I missing a line from the engine somewhere? |
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Title: Re: running hot, and lean, I think. thoughts? Post by verslagen1 on 07/26/15 at 12:58:05 3031386F5E0 wrote:
BINGO! that's all you have to do. There's no other vac lines, only jog. |
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Title: Re: running hot, and lean, I think. thoughts? Post by verslagen1 on 07/26/15 at 12:59:19 0B141215080F3E0E3E06141853610 wrote:
there's a big port on the front of the carb that goes to the top of the slide. |
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Title: Re: running hot, and lean, I think. thoughts? Post by justin_o_guy2 on 07/26/15 at 13:05:40 Thanks. |
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Title: Re: running hot, and lean, I think. thoughts? Post by Serowbot on 07/26/15 at 18:19:43 You can usually spot a CV carb, by the uni-brow inlet... ;D... http://www.harley-performance.com/images/cvcarb_150.jpg |
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Title: Re: running hot, and lean, I think. thoughts? Post by nof1 on 07/28/15 at 13:18:18 quick update, after pulling the carb again it appears the pilot jet is occluded. Voila...the source of the problem. I haven't found anything else amiss yet. So new parts on order and I'll post once it's resolved. Thanks for the help gents! |
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Title: Re: running hot, and lean, I think. thoughts? Post by nof1 on 07/30/15 at 13:56:22 Well I rebuilt it all and got out on the road... Runs great now. I think I got the right combo of jets, or very close. Running a 150 main, and swapped the white spacer for 2 washers. I'm just shy of 1K feet for those keeping score. This thing is a hoot to ride! Reminds me of my first bikes, and brought back that same smile that riding first did. Woohoo ;D |
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