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Post by stancejontland on Oct 10, 2017 19:02:00 GMT -5
back again guys. so got a new carb and i got it on and had to prime the petcock to get fuel and it fired up. had to tune idle then let it idle for a while. took it up to the store and gave it wot and when i let off it died out and coughed air out the exhaust. so i took it back home redid my air mixture and took it back out. so i was riding full throttle for about 30 seconds and hit a bump and my bike died and would not start back up.. so i pushed it home tired and tired and finnaly got it running again took it around the block. got it too top speed and it didnt die out or cough. but when i got home and let it idle it was surging. like rev high then low. the lowest was about 1300 and max was 2300. gunna let it cool down then try again n see whats up. but what could the surging be from and the bump that killed my bike?? oh also when i got home from it dieing out from the bump i had to prime it again. what could cause me to not get fuel??
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Post by catchacuda on Oct 10, 2017 19:45:03 GMT -5
The bump causing a stall makes me think perhaps a critical wire is rubbed through somewhere and contacting ground. Just a thought.
The funky idle could indicate an air leak. Do you have something to spray around components to detect air leaks?
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Post by stancejontland on Oct 10, 2017 20:16:50 GMT -5
where and spray with what?
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Post by catchacuda on Oct 10, 2017 20:20:51 GMT -5
Around the carb connections to the intake and air filter box. The intake to the case is good one to check too. Crank seals can leak too.
I and many others use an unlit propane torch. Some use wd40 or the likes. A change in idle speed when sprayed would indicate an air leak.
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Post by stancejontland on Oct 10, 2017 21:34:57 GMT -5
so spray wd40 around where air is important?? do you think i coould cut some of my tube and replace it with a rubber hose? to get a better seal?
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Post by catchacuda on Oct 10, 2017 22:50:19 GMT -5
Yes wd40, carb or brake cleaner, something flammable.
Modifying your tube could possibly mean having to rejet or tune, but a good seal is important.
Your fueling issue sounds important too though. Starving for fuel could cause a lean condition, and raise rpms. What size fuel lines are you using? Filter clean? Is your gas cap venting, along with the carb? Carb float height set correctly. I don't mean to be a nuisance, repeating myself from other posts. It's sometimes something small and overlooked that can cause major headaches.
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Post by ThaiGyro on Oct 11, 2017 5:27:16 GMT -5
Sounds like many things going on...harder to diagnose. You might consider to try one thing at a time, so you can gain some perspective. Since you replaced the original carb...look at every connection you touched...loosened, took apart, wiggled, whatever. Make sure you have good sealing surfaces on anything that you may have disturbed. As mentioned, that could mean electrical as well. My experiences with idle "hunting" is as described above...alternately sucking in too much air from somewhere. It could also be your new carb. Idle air screw too far out or bad thread clearances. If you use an "indicator" spray, try just a short blast...one connection at a time. If you have any leak it will hinder combustion for a second...then return to your tuning settings. (It adds extra heavy fuel, via whatever leak you my have, that isn't normally there, so slows down your engine rpm for a second) Common leaks: carburetor vacuum port;reed block to engine; reed block to manifold; Carb to manifold. That is starting at the engine and working backward. The carb is small. Be extra careful when spraying. Try to force the spray pattern only to intended connection with a short burst...then wait. I like bottom up because the oil, if not on a leaking connection, will drop down...possibly on one that leaks, potentially confusing the issue. Carb bottom is the float chamber. Not a likely problem for your stated issue. If leaking fuel would be dripping already. Use this below: (From this forum) Check bottom fuel bowl gasket as stated, then move up to spray the mixture screw, (unlikely), then the idle screw, (More common), then vacuum and finally choke/enricher connections. Do not worry about the overflow vent. On many carbs you must check the fuel inlet...DellOrto shown: You need to spray the round area below the inlet...or tighten the holding screw for the nozzle. This too could cause big problems. Check what you can slowly and report back.
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Post by stancejontland on Oct 11, 2017 8:15:47 GMT -5
Its a brand new carb only touched idle and air mixture and im goin to look for electrical issues when it stops raining. I checked my intake manifold and all the bolts i could see involving the engine and they are all secure. And i don't see re jetting my carb because i havent changed my set up at all other than new carb. Ill try to see if im leaking air at the airbox which i think i am. And see if that's the issue. But... My airbox has been jenky for a while and never had any issue before???
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Post by stancejontland on Oct 11, 2017 13:14:49 GMT -5
Just went out tried to run it and i had to prime the fuel again to get it to run. Got it running let it idle for about 5 minutes. And then it started doing what the old carbs were doing by just giving out and dieing. Starts back up but go anywhere near throttle and it dies. Got it to idle again and never touched a idle or air setting and it all of the sudden started idling at like 3 and then died out when i reved it. Wouldn't start back up now. And i also sprayed carb cleaner at all my points and nothing changed when i did that. What is going on!!!!
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Post by catchacuda on Oct 12, 2017 6:33:37 GMT -5
Is this a healthy engine in terms of compression? You mention hearing a rush of air out of the exhaust sometimes when it dies. Could that sound be the release of built up exhaust gas that finally finds a way out of a clogged pipe?
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Post by stancejontland on Oct 12, 2017 9:11:54 GMT -5
Its like when im wot for like 20 seconds. Then let off and let the bike "engine brake" and it wants to shut off so i give it gas and it coughs. Then back to normal. I know my exhaust is worn out and im sure i need a new one could that cause an issue?
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Post by benji on Oct 12, 2017 10:34:24 GMT -5
Its like when im wot for like 20 seconds. Then let off and let the bike "engine brake" and it wants to shut off so i give it gas and it coughs. Then back to normal. I know my exhaust is worn out and im sure i need a new one could that cause an issue? you tried doing the same thing with the choke on? Sounds lean maybe. If it gets better with the choke on (or auto choke unplugged) it could probably use an upjet.
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Post by stancejontland on Oct 12, 2017 13:30:31 GMT -5
It runs the same with choke plugged in and unplugged
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Post by catchacuda on Oct 12, 2017 17:42:03 GMT -5
Im just speaking from my personal experience, I had a hell of a time diagnosing everything- with symptoms like no start, stalling, running poorly, etc. It all stopped when I unbolted the headpipe, allowing exhaust gas to bypass the system, and it suddenly started and ran fine (just ideling, didnt drive like that). I removed the pipe, put a tube in the headpipe (I wasn't putting my mouth on that thing lol) and could barley blow any air through. I had to mod my muffler internally to allow it to run right, even after scraping all the build-up out of the pipe where I could reach and burning out the rest. The muffler portion was literally an engine cork. Can't inhale very well when you can't exhale.
Just a simple test could at least rule it out.
I mean no offense by this, please don't take it the wrong way. You've had multiple threads for an issue that has never seemed to go away, and you've replaced the carb multiple times IIRC. Perhaps it's not carb related. I just hope to soon see you post something like-
"Guys it's running great!!"
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Post by stancejontland on Oct 16, 2017 1:18:13 GMT -5
So should i take off my exhaust pipe?? And clean it out? Thats what i got out of it lol. And also keep going out to start it and my fuel line to my carb is dry. It wont even start now. I also have pics i noticed today when i brought it out of the rain.
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