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Post by thegammaghost on Apr 17, 2017 8:16:10 GMT -5
Hi, i recently got a 1984 honda aero. i got it runing well, then the next morning i go to start it and nothing. i have spark, getting fuel and have compression, but im pretty sure im getting to much fuel. the bystarter is completely broken off, and is just a hole. i can get it to run sometimes, i usually have to plug the choke hole with my finger to get it to start up, and when i do it idles rough, and eventually slows down and dies. sometimes i can get it to idle decent, then i go for a 200 foot ride, with good acceleration, and it feels great. but then after 200 ft or so it bogs down and wont idle and dies. reason i think its a fuel issue is because when its idling bad, if i unscrew the float bowl and drain out the gas, it begins to run/idle better and faster. could it be related to the float? im wondering if anyone knows a completely compatible/ including the throttle cable being compatible, carb i could replace the stock one with. i know the intake side bolts are 48mm apart, and the hole is 22mm. i have a carb that will bolt up, but the throttle slide doesnt go all the way down into the carb, i need to cut a small piece of the plastic on the cable so the cable goes down further i think ( if that will work please let me know) would love any suggestions on getting it running good again. im not even 100% sure its the carb. thanks!       |
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Post by Senna1Rossi on Apr 17, 2017 11:13:05 GMT -5
Welcome. Pics!  |
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Post by ThomasTPFL on Apr 17, 2017 11:38:02 GMT -5
Have you thoroughly cleaned the carb?
Sounds like a flow problem. Either the float valve sticking or clogged or farther upstream. Clogged petcock, fuel filter, something like that.
It runs nice until it empties the fuel bowl then dies until the bowl has time to refill.
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Post by knobby on Apr 17, 2017 12:45:48 GMT -5
There are some carbs that may fit. Are the two mounting holes on center with the 22mm intake hole? On center, a Mikuni VM should fit, if the two holes are raised up, a Keihin PD peanut bore carb should fit.
I checked some pictures, looks like its a Keihin "PB" stock carb with holes on center. The Mikuni should fit if you want to try replacing your carb.
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Post by AtariGuy on Apr 17, 2017 14:21:41 GMT -5
Have you thoroughly cleaned the carb? Sounds like a flow problem. Either the float valve sticking or clogged or farther upstream. Clogged petcock, fuel filter, something like that. It runs nice until it empties the fuel bowl then dies until the bowl has time to refill. literally just had this problem on my scooter. Start by check your flow through the fuel line. Disconnect it from the carb and watch the flow into a gas can or cup. If thats good, check your float and float valve. Be sure the float sits level when the carb body is held staight upside down. Then hook up the fuel line and check the flow through the needle valve. If it drips, not trickles, your valve isn't releasing enough. If you close the float and you still get fuel coming through, then its not sealing shut and flooding the carb/engine. |
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Post by knobby on Apr 17, 2017 14:35:38 GMT -5
If I'm reading the post right, his choke valve is completely missing.
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Post by eclark5483 on Apr 17, 2017 15:07:15 GMT -5
A Polini CP carb setup from scooterswapshop.com will bolt right on. You can buy a kit that has everything you need. For an Aero 125, I'd go with a 19mm Polini. And buy a pilot jets kit too. Stock Polini pilot is a #40, which might be a little too rich.
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Post by thegammaghost on Apr 18, 2017 7:44:02 GMT -5
thanks for all the replies! here are some pics off the bat. as you can see, I HAVE NO CHOKE. and when i plug it, the bike dies. any tips on this. could this be why after a minute ride it dies. i messed with the float last night, and cleaned it all out with carb cleaner, it idled good, but when i went to ride, after about 45 seconds-1 minute it would bog down at full throttle and start releasing smoke out of the exhaust, and then die on idle when i stopped. does this mean im getting to much fuel? i will do the check atariguyfc recomended with the fuell line in with the float apart *I would have replied earlier but the internet at my place went out all day. ill take some pics of the inside of the carb once im off work, thanks again guys, i'm definitely on the right track i believe* |
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Post by ThomasTPFL on Apr 18, 2017 9:04:31 GMT -5
put in a fresh plug. After it bogs and dies pull the plug and see what it looks like. If it's soaks with fuel then yeah, you may be flooding.
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Post by ThomasTPFL on Apr 18, 2017 9:05:54 GMT -5
Oh wait. No choke assembly installed. That'd be a weird flooding air leak thing going on. I don't think you'll get it straight without a good carb.
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Post by 2stroked on Apr 18, 2017 10:16:29 GMT -5
Oh wait. No choke assembly installed. That'd be a weird flooding air leak thing going on. I don't think you'll get it straight without a good carb. Exactly. With the enricher/choke missing, not only is that fuel passage open, it's able to suck extra air as well....if u can't get a new carb right away, cover that hole with a pice of plastic and glue it down. It would still get too much fuel, but the might be able to adjust that out |
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Post by thegammaghost on Apr 18, 2017 13:38:42 GMT -5
Hope fully i can tune it with the hole plugged. as of now, when i plug it, the bike just shuts off (though i usually plug it initially when i start it, then have to let go or it dies). ill give it a shot when i get home. thanks for all the help guys. ill keep you posted.
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Post by knobby on Apr 18, 2017 14:39:43 GMT -5
You need to stick a plug DOWN into the hole to shut off the choke circuit's fuel. Some kind of rubber cylinder maybe? Hack it perma-shut then use starter fluid if you have to.. or just adjust your idle circuit on the rich side and you probably wont even need starter fluid. Here is a pic of the "peanut bore" Keihin PD. Its like a 22x28 dual bore, strange shape bore. I've heard that this type of bore shape has good response from some of the 4t pit bike customers. 22mm throttle response with the extra flow of like a 26mm, but not sure how well it is able to control mixture wide open. It is 49mm bolt spacing.  |
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Post by thegammaghost on Apr 18, 2017 20:57:20 GMT -5
You need to stick a plug DOWN into the hole to shut off the choke circuit's fuel. Some kind of rubber cylinder maybe? Hack it perma-shut then use starter fluid if you have to.. or just adjust your idle circuit on the rich side and you probably wont even need starter fluid. Here is a pic of the "peanut bore" Keihin PD. Its like a 22x28 dual bore, strange shape bore. I've heard that this type of bore shape has good response from some of the 4t pit bike customers. 22mm throttle response with the extra flow of like a 26mm, but not sure how well it is able to control mixture wide open. It is 49mm bolt spacing. okay i plugged the gas tube and then plugged the choke hole. got it idling good, then i went for a ride, and same thing, i ride for like 100-150 feet, and then it bogs down and dies completely. just trying random stuff, i tried it again, unhooked the vacume tube and it ran very nice for like 200-250 feet, and then died completely and i couldnt get it started and had to walk it back. is this a float issue? strange thing is, it ran great for a day or so, and next morning its doing this. errg.  |
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Post by thegammaghost on Apr 18, 2017 20:58:15 GMT -5
Have you thoroughly cleaned the carb? Sounds like a flow problem. Either the float valve sticking or clogged or farther upstream. Clogged petcock, fuel filter, something like that. It runs nice until it empties the fuel bowl then dies until the bowl has time to refill. literally just had this problem on my scooter. Start by check your flow through the fuel line. Disconnect it from the carb and watch the flow into a gas can or cup. If thats good, check your float and float valve. Be sure the float sits level when the carb body is held staight upside down. Then hook up the fuel line and check the flow through the needle valve. If it drips, not trickles, your valve isn't releasing enough. If you close the float and you still get fuel coming through, then its not sealing shut and flooding the carb/engine. going to try this tomorrow |
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