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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Suggestions /cgi-bin/YaBB.pl?num=1145243747 Message started by steelwolf on 04/16/06 at 20:15:47 |
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Title: Suggestions Post by steelwolf on 04/16/06 at 20:15:47 As of late I have been playing around "down there" and my bike is running great. However...I shaved the spacer to 1/2, installed the straight pipe, and rejetted to a 152.5 all with no problem. Then went and drilled holes in the air box cover. ( big mistake ) Man I never heard so many backfires in my life. Took all of about five minuets to pull it off again and tape up the holes. She's a might bit more satisfied now. But...It still backfires rolling off the throttle. Mostly when changing to 2nd, but so far not at shut down. Here is what I'm thinking. 1. I should jet higher. Maybe 155, though I am curious why rob is running a 300 2. I should cut the spacer to 1/3 or 1/4. Some others here went that route but I'm not sure who. 3.I could have an exhuast leak in the pipe connection. And it also seems that my top speed may have dropped. I havent really tried to push it, just sounded like I was at the top of the revs early. But I get there quicker with much more power. Any thoughts? ??? |
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Title: Re: Suggestions Post by lancer on 04/16/06 at 21:13:18 Backfiring on decel is caused by a lean pilot circuit...richen it and the backfiring will stop. When you drilled the holes in the air box you let in more air, which leaned out the mixture, causing more backfiring. Shaving the white spacer changes the position of the needle which richens the midrange. Changing the main jet to a larger size will richen the high range. Neither the white spacer nor the main jet affect backfiring. |
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Title: Re: Suggestions Post by 911radioman on 04/16/06 at 22:42:15 As an example of how little it takes to make things lean up, I have been contemplating sticking in a #55 pilot jet as I still have a touch of backfiring. Then yesterday, I got to thinking about what all I had done to the bike and decided to try a couple of things before doing the jet. I had desnorkeled when I put my K&N filter in, so I decided to reinstall the snorkel and see what happened, with the premise being I would be restricting air flow, thus increasing the richness of the mixture. When I did that it cut the backfiring down considerably to almost nil. Now, I think that with just some tweaking of the idle mixture when I get the chance, I can cut that all the way out and not have to rejet the pilot circuit. Had this not been as effective as it appears to currently be, my next step was to desnorkel again and reinstall the OEM air filter, knowing that it is way more restrictive but add a bit more air without the snorkel. But I don't believe I'll have to do that. I even have (had) a plan to slowly trim say a 1/4" at a time off the bottom of the snorkel to slowly increase the air to counter things if I got too rich, but that too is probably going to be unnecessary. So, that said, little things such as drilling holes in the air box can make a big difference in the overall fuel/air mixture. |
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Title: Re: Suggestions Post by steelwolf on 04/17/06 at 18:06:53 OK, I change the pilot jet to richen the lower end. Where should I start? Up one size or something bigger? 911radioman wrote:
And thats why the tape went over the holes. Thanx for the help, the both of you. |
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Title: Re: Suggestions Post by necropsy on 04/17/06 at 19:00:27 Stock pilot jet is most likely a #52.5 Go up one size, (increments of 2.5) I've not read of anyone going any higher than #55 My 05 S40 is suffering from the exact same symptoms. From what I've read, popping and backfiring are to be expected from a finely tuned Mikuni carb with extremely open exhaust, but sometimes it's a bit much. I'm also suspecting a lean pilot circuit, but when I went to the stealers, they only stocked increments of ten, and wanted to sell me a jet kit. No thanks, just the jet please. I'll try someplace else tomorrow..... |
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Title: Re: Suggestions Post by Reelthing on 04/17/06 at 19:57:07 steelwolf wrote:
He has a different carb - he's using an Amal I think - in place of the mikuni bs40 - it sizes jet's different the course tune on all carbs is fairly simple - it's the fine tune that can take a lot of fiddle'n - and have heart you get to do it again when the air temp changes 20-25f or you change the elevation 2000 feet or serious change in humidity - if you want to stay on the razors edge - it's fun :) |
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Title: Re: Suggestions Post by steelwolf on 04/17/06 at 20:00:35 My local stealership doesn't stock em either. They told me they come in packs of 4 and they could order them if I bought them all. $20.00 for the four of them. I've got $5.00 for anyone who has an extra and I'ld also happily kick in the 40 whatever cents it is to stick it in the mail vs. paying for 3 extras. |
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Title: Re: Suggestions Post by steelwolf on 04/17/06 at 20:16:33 Reelthing wrote:
Gee thnx. ;D LOL All I really want is to cut it down to a minimum. I think I'll change it out anyway and then see how it works. At the very worst I wind up putting the original back in. Good thing I like to tinker ;). |
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Title: Re: Suggestions Post by SeattleSavage on 04/17/06 at 20:25:17 Steelwolf, I have a 55 pilot. Dennis Kirk sells them in two's. I'm running a 883/1200 sporster muff and it doesn't backfire on shutdown at all. It pops and spits a little on hard decel, but I think that is fairly normal. Let me know if you want it. How bowt' 3 bucks and we'll call it good. |
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Title: Re: Suggestions Post by steelwolf on 04/17/06 at 20:32:02 SeattleSavage, check your massages :) |
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Title: Re: Suggestions Post by SeattleSavage on 04/17/06 at 20:52:23 got it, check yours |
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Title: Re: Suggestions Post by steelwolf on 04/17/06 at 20:54:27 Tag, You're it! ;D |
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Title: Re: Suggestions Post by SeattleSavage on 04/17/06 at 21:14:11 Not to be childish. But, YOUR IT! I QUIT! |
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Title: Re: Suggestions Post by Reelthing on 04/18/06 at 06:11:26 steelwolf wrote:
Excellent read on sometimes where some get a bit discouraged as they want an exact setting and thats just not possible you can get close say 95% of the way but that last little bit does come from tinkering and trial and tinker and trial and what you want in the end - an example is the 95 , its a commute bike that rarely sees even 60mph what it needs to do is run as cool as possible in the summer heat 1-1.5 hours each way, protect me from flying objects, always start easily, get decent mileage, give a soft ride, handle and stop well. Last year it did 12k miles of this. Youll notice maximum performance is not one of the goals as defined by peak power, acceleration, and speed. It took a lot of tinkering to get it this way but its oil temp runs 10c cooler, handles better, and will out stop the 02 the 02 however will flat leave it in the dust. Really fun stuff to do. |
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