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Post by 99redrider on Jun 27, 2011 23:49:48 GMT -5
I have an 84 aero 80 that runs like crap. it won't go any faster than 32 mph and when it does it starts missing. when i give it more throttle the scooter slows down even when I'm going down hill. when i come to a light and sit for more than a few seconds the engine loads up and will not move until it clears up, by then the cars behind me are blowing their horn for me to move or pull over. what i have done is clean the carb, switched oil to Honda g2 oil, checked the fuel line. but it's been one disappointment after another. i lost count of how many times I've remove the carb. can anyone please help me. I'm at the point of just selling this thing, but it is so much fun to ride when it is running right!
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Post by bear4570 on Jun 28, 2011 12:43:53 GMT -5
New spark plug is never a bad idea. The carb is jet just too lean from the factory. You need to change out the 88 for a 90 main jet. Honda Part Number 99102-GHB-0900, about $5.00 at your Honda dealer. Do a compression check. Does the scooter idle? If so then most likely the issue is the carb. Check the float level. What does the spark plug look like with a proper "plug chop"? hondaspree.net/wiki/index.php5?title=Spark_Plugs_and_Plug_Chops I agree the Aero 80 is fun to ride. I ride mine more than I do my 50 cc scooters or my Aero 125. But then the 125 isn't "right" yet. |
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Post by 99redrider on Jun 28, 2011 14:36:52 GMT -5
i changed the spark plug with the same result. the engine idles after i adjusted the barrel nut by the throttle, the idle screw does not affect the egine before or after the barrel nut adusted. i checked the float but there's no level adjustment and the float seems ok no holes that i can see. but when i drain the bowl it takes off better. also when i remove the air filter it runs better but the top speed is the same @ 32 mph no higher. when i first bought it top speed was @ 40 mph when i added two stroke oil bought from autozone it gradually slowed down. when that happened i drained and cleaned resevoir, and got honda g2 oil. at the same time i cleaned the carb and noticed rust with the fuel, so cleaned the fuel that. when i put it all together what i got is where i am at now. thank you for replying, pleace continue.
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Post by bear4570 on Jun 28, 2011 15:03:44 GMT -5
You adjust the barrel nut AFTER you adjust the idle stop screw. The slide NEEDS to rest on the idle speed/stop screw for a proper idle. The adjustment procedure is in the service manual.
Do you have the service manual? Without it you are shooting in the dark.
Do not run without an air filter, you will lean out the motor so bad you will melt the piston. AKA a junk motor.
I am beginning to suspect you have a belt issue. Pull the cover and measure the width of the belt. The spec is in the service manual.
While you are in there checking the belt, pull the variator, clean out all the grease and check the rollers for flat spots. Replace as necessary, oh and the stock roller weight is 16 grams. When you reassemble the variator, use no grease and leave the back cover that is held on with 3 little bolts, off.
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Post by 99redrider on Jun 28, 2011 16:38:12 GMT -5
With the barrel nut loose and the air screw 1 and 1/2 out the engine will not idle no matter the position of the idle stop. I will check the variator and rollers. I will let you know what I find. Thank you so much.
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Post by bear4570 on Jun 28, 2011 16:52:41 GMT -5
With the slide removed from the carb, you can look down the slide bore and see the needle protruding into the bore. The wide short notch in the slide rides on the taper of the screw. If it does not, the the screw has been trashed by some one. At idle the has to be slack in the throttle cable. Otherwise you may not be getting WOT.
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Post by 99redrider on Jun 28, 2011 20:01:39 GMT -5
that little notch is the idle stop. after looking at it closer i see how it works, with the throttle cable slacked the idle stop is raising and lowering the slide depending on the idle stop position, so whats happening is the slide need to go higher than what the idle stop can offer which is not good. is that right? after that i'm lost. i removed the side cover to check the belt now i need to measure it. if it is 13.5 mm or smaller replacement is due. before i open it further do i need all that measuring tools that i don't have or can i eye ball it? i'm looking up the variator so i know what i'm looking for, i'll keep you up dated to ensure i don't screw up to bad.
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Post by bear4570 on Jun 29, 2011 0:17:32 GMT -5
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Post by 99redrider on Jun 29, 2011 16:57:51 GMT -5
i will go by harbor freight and purchase the last option tool since i have reading glasses. i'll get back to you on the carb info hopefully removal is not required. also can you give me a clue on the variator to make my search quiker? thanks again. the good side is i'm getting to know more about my scooter for future reference.
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Post by bear4570 on Jun 29, 2011 21:21:21 GMT -5
In the service manual there are some decent pictures of the variator and the how to disassemble/assemble are OK.
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Post by 99redrider on Jul 3, 2011 18:16:41 GMT -5
i tried a couple of things with no success. i BBQ my muffler thinking it was clogged then disconnected the auto choke, again each attempt nothing. what section of the manual will i find the variator? this is my first time doing this. my theory knowledge is not working. i'll get back with you on the carb and slide #. i bought the utility caliper, measured the drive belt 13.61. i will replace the belt as soon as the engine performance improves. an aero 125 will be great about now, but i'm committed to see this through. if i can't fix this thing i can't fix nothing. i'm hoping a little drama will keep me motivated.
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Post by bear4570 on Jul 3, 2011 22:38:11 GMT -5
Section 8, "Drive & Driven Pulleys/Kick Starter/Clutch" Section. It is called the "Driven Pulley."
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Post by 99redrider on Jul 6, 2011 14:34:27 GMT -5
the carburetor # is PB 540AVH1 or Pb 54DVH1, length of slide is 24mm. side that goes to intake 19mm, bolt holes center to center 43mm. i've seen carbs with 19mm, bolt holes 49mm. can you recommend a replacement carb? i'm loosing all hopes. i wanna ride! thanks for the manual info. please don't give up on me.
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Post by bear4570 on Jul 6, 2011 15:39:33 GMT -5
That is the right carb number but your slide measures shorter than mine which is 24 mm. Yeah I can, find a Keihin PB2HB or a PB2BG carb, both or 18 mm carbs with electric bystarters, however the PB2HB has an 18 mm throttle bore while the PB2BG has a 16 mm throttle bore. The Aero 80 intake has a 19 mm bore.
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Post by 99redrider on Jul 6, 2011 23:36:21 GMT -5
i rechecked the carb bore because the first measure was of the black spacer. this time i check the carb bore it turned out to be 16mm. are the bolt holes center to center on my measurement correct? sorry for asking but what is a bystarter and what is it for? is the 18mm better than the 16mm, will the bolt holes fit my intake and my air filter? what kind of set up is on your aero 80?
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