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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Two questions .. Bogging and setting float height /cgi-bin/YaBB.pl?num=1570749012 Message started by Junker on 10/10/19 at 16:10:12 |
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Title: Two questions .. Bogging and setting float height Post by Junker on 10/10/19 at 16:10:12 1. The service manual is kind of vague with setting the float high, any links / post that cover this? 2. I'm stuck with a severe bogging and carb backfiring issue at any acceleration, or holding speed over 40 mph. I have cleaned the carb, tried almost every poss combination of jet changes, including setting to stock. Have run the bike with and without the air box cover, and have placed in a clean filter. Nothing has helped. The tank is clean and fuel is flowing strongly out of the gravity feed petcock. At the moment the only thing not stock on the bike is a dyna muffler, yet it stated bogging with the original muffler that came with the bike. Could the float being out cause this? Is is happening because i'm starving for fuel? |
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Title: Re: Two questions .. Bogging and setting float hei Post by Gary_in_NJ on 10/10/19 at 16:45:10 Probably not. There are plenty of YouTube videos that show how to set the float height, it’s simply bending the tang. A mid aligned float usually results in a carb that overflows with the engine off. My guess is your problem is from a failed vacuum fuel petcock. |
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Title: Re: Two questions .. Bogging and setting float hei Post by verslagen1 on 10/10/19 at 18:37:47 5E617A7F7166140 wrote:
why sure there is... http://suzukisavage.com/cgi-bin/YaBB.pl?num=1367212825 can be found in the index (link below) Quote:
yup... probably. |
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Title: Re: Two questions .. Bogging and setting float hei Post by Junker on 10/10/19 at 20:38:32 Except my petcock is not vacuum ... |
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Title: Re: Two questions .. Bogging and setting float hei Post by Gary_in_NJ on 10/11/19 at 07:09:48 It it a genuine Yamaha part? |
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Title: Re: Two questions .. Bogging and setting float hei Post by stewmills on 10/11/19 at 07:47:03 Is it spitting out black poofs of smoke/soot? If so, that is a sign of being overly rich and the bike is flooding. If it is just "not wanting to go" beyond a certain throttle level, maybe you have a sticking slide or a leak in the slide diaphragm not letting it pull past a certain level to lift and open the throttle. When you clean the diaphragm and slide, the most important things are NOT to use carb cleaner because it is not good on rubber/plastic and to clean the slide and carb body VERY good as to not leave fingerprints or oil prints on either. The tolerances are super thin and any oils can cause sticking and cause trash to stick to the slide and cause sticking, etc. |
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Title: Re: Two questions .. Bogging and setting float hei Post by ohiomoto on 10/11/19 at 08:27:24 If it's not the petcock it's the sticky slide that batman mentioned. I had enough problems with mine that I ponied up the $120+ for a new one and it was money well spent. |
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Title: Re: Two questions .. Bogging and setting float hei Post by ohiomoto on 10/11/19 at 08:28:18 And if you had it apart recently, make sure the diaphragm is properly seated. |
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Title: Re: Two questions .. Bogging and setting float hei Post by Gary_in_NJ on 10/11/19 at 10:51:52 I followed that link that Verslagen posted that provides the float height of 1.06" to 1.114". While the range is correct, please note that the photo in that thread is a perfect example of how NOT to check the float height. On the needle valve you will see that micro spring loaded pin that makes contact with the float tang. It is important that the pin not be compressed while taking the measurement. Therefore, the height must be checked when the carb is on its side, and rotated just enough where the tang makes contact with, but doesn't compress, the spring. I'm going to add this info to that thread as well. If the problem you are having arose prior to you taking apart the carb, it's more than likely not the float height. The only way the float height will change is if the tang is adjusted (intended or unintended). They really don't change from normal use. However, during carb maintenance it makes complete sense to check float height because you may have accidentally moved the set height. |
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Title: Re: Two questions .. Bogging and setting float hei Post by Junker on 10/11/19 at 13:39:07 The issue has been an on going one that has slowly built up to where it is now. The needle slide has signs of a lot of wear. There are areas on the slide where the plastic coating has been worn down to the metal. The diaphragm is in good nick (no holes etc) and seems to be seated properly. This will be checked again this weekend. Regarding the petcock, i'm not sure if it is a genuine Yamaha part. It was already on the bike when I purchased it The float looks to be set right. Thanks for the replies guys! |
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Title: Re: Two questions .. Bogging and setting float hei Post by stewmills on 10/11/19 at 14:44:25 The marks in the slide aren't necessarily bad. Several I have seen will have parts where the black color seems to weak off slightly over time. So long as you are confident it is clean, seated properly and pulling a vacuum you should be ok. If you have the carb off the bike and have an air compressor handy, you can open the throttle valve and give a blast of air through the carb body (can't remember exactly where to point the air) and watch the vacuum pull the slide up. If you can get this "test" to work and you know the slide is moving freely up and down all of the way, you can eliminate that at least... |
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Title: Re: Two questions .. Bogging and setting float hei Post by Yoshi on 10/11/19 at 19:12:58 Is the port for the vacuum petcock capped off? How does it act at full speed? You said it backfires from the carb? Sounds like a vacuum leak What jets are you running? |
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Title: Re: Two questions .. Bogging and setting float hei Post by SpamyToo on 10/12/19 at 00:20:55 Its probably not, but hasnt everyone been waiting for a cam adjuster plunger incident. Its traveled so far out that the loose chain has jumped a tooth. Ive had that happen on other vehicles and acted that way, like severely bad timing, barely running up to speed and backfiring like crazy. Fact that I dont think its happened to anyone yet is pretty good chance thats not the problem. But maybe someday it might creep up. Or perhaps 1 tooth on a single cylinder bike like this is such a drastic changed it wouldnt even run. |
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Title: Re: Two questions .. Bogging and setting float hei Post by ohiomoto on 10/14/19 at 09:48:41 447B60656B7C0E0 wrote:
That's what mine looked like. Replace it. It's not worth the trouble. And if you want to know where that black coating ended up, look inside your carb body. |
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Title: Re: Two questions .. Bogging and setting float hei Post by Junker on 10/14/19 at 21:06:28 Quote:
Isn't that black stuff the result from the carb back firing? Quote:
Yes, with a new vacuum cap. Quote:
When cold I can slowly climb her up to 50mph, with the bike bogging at the slightest twitch of the throttle. Once warm, I can't get any faster than 30mph. Quote:
None that I can see. I have check everywhere. Quote:
I have tried straight stock, a combination of the stock and Lancers rejet pack, etc. All to no prevail. Quote:
I have the Versy mod so nothing there has fallen apart. Would wrong timing make the bike bog? |
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Title: Re: Two questions .. Bogging and setting float hei Post by ohiomoto on 10/15/19 at 05:57:36 506F74717F681A0 wrote:
My bike doesn't backfire. |
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Title: Re: Two questions .. Bogging and setting float hei Post by Ed L. on 10/15/19 at 06:12:00 I would check for a vacuum leak leak by spraying the outside of the carb with cleaner when the bike is running. It's an easy check and might show something. Start with the simple stuff and work up. Dropping in a new plug is always a good idea when trouble shooting just to make sure it's not failing. I'll leave the carb work to the carb guys on the site. The have forgotten more than I know about carb tuning. ;) |
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Title: Re: Two questions .. Bogging and setting float hei Post by ohiomoto on 10/15/19 at 07:24:32 645B40454B5C2E0 wrote:
The way our carbs work is that when you turn the throttle, it opens a butterfly valve which allows more air to pass through the carb. That moving air creates a vacuum that pulls the slide up to allows more fuel/air a mixture (this mixture is controlled by your jetting). If that slide sticks at any point, the system will go lean because the butterfly is taking more air, but the slide isn't giving more fuel. So, you can throw whatever jets you want in there and you will end up lean anyway. Mine would stick momentarily during acceleration creating a lean condition in the midrange. I attempted to jet around the issue because I just assumed that it was simply lean in the midrange. Then it got worse. Once it wouldn't go over 20 mph. Another time it got stuck while going 45. I cleaned mine a few times but it would still stick. I replaced it with a new slide and when I rejeted, I actually ended up leaner than I was before. My bike ran much stronger, it stopped backfiring (even on deceleration) and my fuel economy went up. It was the best $120 I spent on the bike. |
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Title: Re: Two questions .. Bogging and setting float hei Post by Gary_in_NJ on 10/15/19 at 08:42:33 Are you sure it's backfiring through the carb? That's an indication of a serious timing issue and makes me think that the cam has jumped a sprocket or two. That would explain the poor running. Don't confuse after fire (that large pop on decel or shut down) with back firing. Back firing will blow the airfilter apart. If you have true backfiring through the carb, stop riding that bike and check the cam timing. Have you ever looked at the condition of the automatic cam chain tensionor (ACCT)? I'm sorry I didn't pick-up on the carb back firing issue earlier. I'm just so accustomed to 99% of the people on this forum describing their afterfire as backfire that I have developed a mental filter that keeps me from reading it. |
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