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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Runs great at 50-58 , pops when given more throttl /cgi-bin/YaBB.pl?num=1437428829 Message started by rtebbs8996 on 07/20/15 at 14:47:09 |
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Title: Runs great at 50-58 , pops when given more throttl Post by rtebbs8996 on 07/20/15 at 14:47:09 On my 87 4 speed, I can run 50-58 ish all day but when I pish it to 60 its wicked loud and it usually pops which jerks it forward. I know I have a ways to go because I briefly open the throttle a lot and it sounds good. Like when it pops I'd open the throttle some more and it seems as if it briefly smooths out as I pass 63 ish but the slightest closing of the throttle results in the same backfire, almost as if its not backfire but its idk starving for fuel maybe? The petcock is the raptor with great fuel flow so that's not it. Idk. I'm planning on going on a 100 mile trip with around half of that on the highway behind my parents trailer so we won't be going over 60. So I should be fine but I don't know what is causing this. Its only when Im around between past a 1/2 and over 3/4 throttle it will do this. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by justin_o_guy2 on 07/20/15 at 15:31:06 Has anything changed? You do something? It's been running fine, just suddenly did this? |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/20/15 at 15:37:23 No. Its always done this. I bought it at 19k. Did the cam chain mod at 20 thats about it. Changed spark plug when I first bought it, change oil every 750-1000 miles. guy I bought it from said "It's not really a highway bike, only does about 60-65" I have gone on the interstate, stayed in the right lane at a steady 65 did push it to almost 70 but felt I was pushing the bike hard. anyways yes it has always done this, sometimes when I just start it in the morning it wont, other times it will but usually it does this. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by HovisPresley on 07/20/15 at 15:59:11 Half to three quarters throttle? Search for 'white spacer mod'. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by justin_o_guy2 on 07/20/15 at 16:52:24 I hope someone else is paying for the oil. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/20/15 at 17:27:26 Haha. At 4 bucks a quart it doesn't hurt to change it frequently, now every hundred would be different haha |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by Serowbot on 07/20/15 at 17:58:57 Are you running an open pipe?... |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by Dave on 07/20/15 at 18:29:07 The white space mod may be a start.....but at full throttle it should be able to go way past 60 and run smoothly......if the main jet is working properly. (The needle jet/jet needle controls mid range mixture and can cause mid range surging......what happens if you hold the throttle wide open)? I think you have a problem with your carb and it could use a cleaning.....and most likely it is the main jet circuit that is plugged and restricting the fuel flow. You need to tell us that air cleaner and muffler you have.....then we can suggest some proper jetting to start with. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/21/15 at 03:08:24 I'm running apod filter and stick pipe. Previous owner debaffled and rejetted ( I assume got the debaffling) but I still know soon enough how he rejetted. Last night I took the bowl of and cleaned it out. Is there any method of cleaning it without removal and disassembly completely like running seafoam or anything of the sort because as of now I can get but with how it runs |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/21/15 at 03:10:46 When I go past half throttle and near full throttle it seems to smooth out and it surges forward and accelerates nicely but if I hold it in the area where it pops ot does just that, pops. Ive ran it at 68 ( might as well call or 70) sustained and it wasn't full throttle quite yet but it was nearing it. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by Dave on 07/21/15 at 04:01:45 What is a "stick pipe"? Is it just a straight through piece of pipe without a baffle? If so....that and the Pod filter are going to make it very difficult to jet and get it to run smoothly. https://www.youtube.com/watch?v=KjKUKhHQLHg You also need to check and make sure the pod filter is not blocking the air vent at the top of the carb inlet. Some of these pod filters block the oval vent at the top of the inlet and the carb slide cannot work properly. If you take the float bowl off and can get the main and pilot jets out ad clean them, that may be adequate. It really depends on what is making the bike run poorly. Changing the white spacer on the slide needle to 2-3 washers may require you to remove the carb....however some folks have been able to rotate the carb and get the slide out of the carb. The washers are #4 machine screw washers and are available at hardware stores that have a good selection of screws....or you can get the kit from Lancer that also includes gaskets and a selection of jets. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/21/15 at 04:59:31 I replaced the pod with a new pod while back and I trimmed up the area that covered the little inlet, so that's fine. The stock pipe is literally the original muffler and I know some baffles were removed. So you can clean the main jet pilot jet ie get to them without removing and complete disassembly? I assume a simple cleaning would be the fix as there's nothing else wrong with it. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by Gary_in_NJ on 07/21/15 at 05:21:03 Remove the carb and give it a good cleaning. Make sure that the jets are unclogged and that the float height is correct. On an older bike it probably wouldn't hurt to do a leak-down test, if for no other reason to rule out any potential compression or valve train issues. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by Dave on 07/21/15 at 05:23:58 3D3B2A2D2D3C777676794F0 wrote:
This is what had me confused......it appears you had a typo and meant to say "stock" pipe, not "stick" pipe. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/21/15 at 05:36:39 How long does a carb cleaning take. Could I remove it night before and clean it in the morning put it back together and have it running by afternoon someday perhaps a weekend? |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by Gary_in_NJ on 07/21/15 at 07:39:44 6563727575642F2E2E21170 wrote:
I guess it depends on your experience and capability. I can have a (single) carb off almost any bike, cleaned, back on and adjusted in about an hour. But I'm experienced (and good ;) ). If this is your first time with this type of procedure it could take you 2x or more. BTW, cleaning is not a soaking exercise, rather a rub-n-scrub one. Once the carb is off the bike the procedure you will remove the bowl and slide. From there you will use carb cleaner and brushes/wires to dislodge any gum/gunk in the jets and passageways. Use safety glasses, gloves and a turkey pan (to contain the mess and any parts that want to run away from you). The number one problem people have with carb cleaning is getting the screws removed from the bowl and slide. Use a JIS srewdriver and you'll be good to go. I ALWAYS replace those JIS screws with hex bolts. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/21/15 at 07:46:03 Also do I need to buy a kit or anything before or can I just take what I have clean it and reinstall? I've heard of doing a "bath" which means submerge entire carb in carb cleaner and spraying it out with compressed air, what is that about? I'm thinking of cleaning it today if it will only take an hour or two to clean |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/21/15 at 07:48:03 Well last night I did remove the bowl so it shouldn't be a problem today. I'm mechanically inclined so I assume it won't be nooby to me. I've cleaned nitro engines before carbs and all. I know its very different but still. Alright I'll clean the carb later and put it back on and hopefully my top end starvation issue will go away |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by Balet on 07/21/15 at 08:31:48 I like the idea of hex bolts on the bottom of the bowl, what thread size and length are they? |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by verslagen1 on 07/21/15 at 09:07:54 54777A7362160 wrote:
open up the tech section index, go down to carb specs, go to bottom of thread. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/21/15 at 12:28:54 Got the carb cleaner and the tools and seat off now its time to dig in. I'll let the parts soak in the cleaner then spray them out with either computer air duster or my father's air conpressor |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/21/15 at 14:44:47 Well got the carb off went to take the slide top cover off stripped a screw. Well I disregarded the black slide and just cleaned the bowl and jets. I think I found my problem it was the jet by the fuel line (don't know which one) it was all clogged in the little screen there were tiny hairs all kinds of crap. Cleaned all jets with carb cleaner and boy is there a difference. It doesn't hesitate as I accelerate hard like I used to. Shifted Into third at basically 45 where I usually so it at 38-40 because it popped. NO popping or hesitation. Can't wait to test it out on the highway on the top top end of speeds to see if it can maintain highway speeds easier as the fuel jet is all clear. That's was he problem it was starving for fuel |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by jcstokes on 07/21/15 at 14:47:50 I note that Gary in NJ said to scrub the parts with a brush. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/21/15 at 15:24:09 There was really nothing to scrub everything was mainly clean as its not the first time its been open since 87. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by Gary_in_NJ on 07/22/15 at 05:26:23 383121263D393721520 wrote:
I used the term "rub-n-scrub" to make the point that simply putting the carb in a jar of cleaner wouldn't solve the issue of clogged jets and carb orifices. In order to clean a carb you need to make contact with the stuff that's clogging things up. Of course, if you have an ultra-sonic cleaner, an overnight bath will due the trick. |
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Title: Re: Runs great at 50-58 , pops when given more thr Post by rtebbs8996 on 07/22/15 at 06:02:19 I directly sprayed al the gunk off the jets then resprayed with carb cleaner with the little straw. It runs better now a lot so if it worked it worked |
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