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Post by nateshelton on Aug 14, 2020 11:01:40 GMT -6
Ok so I rebuild my carb and I put it in an ultrasonic bath to help clean it. After putting it back together I’m still not getting gas to the cylinder. What could be causing this? What should I be looking for in the carb to fix this problem? Floats are at the correct height.
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Post by knoizy on Aug 14, 2020 14:26:25 GMT -6
Have you tried the drain screw to check its getting gas in both sides?
Could you see daylight through all the jet holes?
Airline to blow out the various passages?
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Post by nateshelton on Aug 14, 2020 15:27:42 GMT -6
Yes I’ve tried all that. I have fuel in the carb but none to the engine. Yes I can see daylight through them all.
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Post by knoizy on Aug 14, 2020 15:47:46 GMT -6
Ok remind me what is happening anyway - starter cranking the engine OK? Everything in the air intake OK? Got suction through the carbs when cranking? Changed any electrics since she was last running?
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Post by nateshelton on Aug 14, 2020 16:30:57 GMT -6
Ok I bought it not running. I replaced the starter and it turns over with ease. Yes I believe there is plenty of suction. So the engine turns over just won’t start I have spark and good compression. When I pull the plugs they are dry.
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Post by knoizy on Aug 14, 2020 17:42:14 GMT -6
Its not a problem I've had but if you're sure its a fuel delivery issue then that must only leave a few variables. Diaphragm needs to be in good shape, still fresh and bendy, I guess you checked the plunger, springs and butterfly were working on the bench. So that leaves fuel blocked on the way out or air vent blocked on the way in. I also guess you've tried starting on full choke or throttle and still got dry plugs?
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Post by nateshelton on Aug 15, 2020 9:43:04 GMT -6
Yes I’ve tried everything I know too! Would it be bad to set the float to a richer level?
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Post by jwcjcolwell on Aug 20, 2020 5:15:48 GMT -6
Pull the filter off the carb, open the fuel cap, cover the inlet opening with your hand, then bump the engine. This will put full vacuum on the bowl if anything is plugged this can suck it on through, afterwords check the throat of the carb for fuel. This will also bypass a clogged fuel tank vent. I know this is only my second post, but I've dealt with a lot of different carbs. The choke on this bike isn't a choke in the conventional sense, it opens a different passage to let fuel into the intake instead of sucking more fuel through the jets. When I rebuilt my carbs it took two days in soak and a good media blasting with baking soda to do the job.
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Post by jwcjcolwell on Aug 25, 2020 23:02:11 GMT -6
Have you made any progress?
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Post by adarngoodjoe on Aug 27, 2020 21:33:41 GMT -6
If you don't have the air filter mounted to the carb or some kind of air restriction over the intake side of the carburetor near the top of the throat (where the opening that goes to the diaphragm), you won't get enough vacuum to draw fuel out of the bowl. I used a piece of tape to partially cover the top opening back when I first began working on my bike. The carburetor on this bike is very vacuum dependent. There was a very noticeable difference when I changed from a hiflo air filter to a kawasaki branded filter in my factory airbox.
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Post by nateshelton on Sept 17, 2020 14:15:13 GMT -6
Ok I took the air box off. Put my hand over the back of the carbs and I got gas all over my hand but still nothing on the spark plug.
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Post by jwcjcolwell on Sept 18, 2020 18:41:09 GMT -6
Okay, so it is getting fuel through the jets from the bowl. Can you start it with a small shot of starter fluid in the carbs? I know you said your floats were set properly, but you never mentioned your other settings. How far did you bring your idle jet out from seated, and did you shim anything or cut diaphragm springs? How far did you disassemble your carbs? If it was a full tear down to only carb bodies you could have an idle and sync issue. Try cranking it with the choke full on while holding the throttle barely open. If that works the idle likely isn't set properly.
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Post by nateshelton on Sept 20, 2020 20:33:07 GMT -6
So I took the carbs completely apart. Everything that could be taken off I took off. Also I bench set the carbs and I didn’t mess with the springs. My air to fuel screw is 2 full turns out. So when I spray starting fluid in it sometimes it will back fire and sometimes it will do nothing. Yesterday when I was messing with I turned the key on and as soon as I did it backfires. Not sure where to go from here. So when I try to start it and run the battery down from trying to start it then pull the plugs and they are not even wet and don’t smell of gas. My carbs are clean but I still don’t think I’m getting fuel to the cylinder. Why would this be?
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Post by Blaine on Sept 21, 2020 5:22:28 GMT -6
So I took the carbs completely apart. Everything that could be taken off I took off. Also I bench set the carbs and I didn’t mess with the springs. My air to fuel screw is 2 full turns out. So when I spray starting fluid in it sometimes it will back fire and sometimes it will do nothing. Yesterday when I was messing with I turned the key on and as soon as I did it backfires. Not sure where to go from here. So when I try to start it and run the battery down from trying to start it then pull the plugs and they are not even wet and don’t smell of gas. My carbs are clean but I still don’t think I’m getting fuel to the cylinder. Why would this be? Only thing I can think is valves need adjusted (too tight) or timing off.
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Post by jwcjcolwell on Sept 29, 2020 11:44:06 GMT -6
I agree it seems like to much overlap, so either the cam timing is off or the valves are to tight. Have you had the top end apart yet? If the bike is backfiring it is loading the exhaust with fuel and the flame front is propagating through the exhaust valve. This seems to be made evident by the use of starting fluid, if that is in fact the case the engine is likely not making enough vacuum to pull fuel through the idle circuit. I would check vacuum at each carb and go from there, but it seems likely that your valves are to tight if the cams haven't been messed with. When you adjust the valves make sure the jam nuts are tight not just snug or you will end up with a broken cam or worse. Ask me how I know.
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Post by nateshelton on Oct 2, 2020 10:59:41 GMT -6
Ok I’ve Tried every thing that has been suggested and still nothing. Does anyone live near Crittenden, ky it’s like 30mins south of Cincinnati, Ohio that wants to come help me?
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Post by jwcjcolwell on Oct 14, 2020 0:47:32 GMT -6
I live in sadieville, and could probably work something out.
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