she dogs, then flies! intermittent loss of power

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she dogs, then flies! intermittent loss of power

Postby kenyrider » Fri Jun 01, 2018 3:36 pm

1995 honda helix. cannot pin down this loss of power. I get on highway and it struggles to get to 62, then BLAMMO! as if a pea was stuck in the fuel line and suddenly pops out, it fixes whats wrong and suddenly lurches to 72 mph no problem!

last summer the carbuerator insulator boot was cracked and replaced it. ive also replaced the spark plug and ignition coil (seemed to help smooth accel but still doing this). im baffled. i took out the fuel filter sponge and cleaned.. not clogged. exhaust seems fine, no leaks. air filter isnt clogged.

some factors.. in the morning going to work when its still cold (im in colorado but the bike had no problems with altitude for last ten years, never changed jets) it seems to run better. BUT after work when its warm, you can almost feel compression on the engine and the MAIN telltale sign its going to do it, is that it farts and sputters and backfires when you let off the accelerator.

AGAIN, most times if you force it, aka get on the highway and just keep going while it sounds like maybe its sucking for air (thats a guess i dont really have a basis to describe that), but just keep going a mile or two, it suddenly fixes its problem and screams down the road like always (this is of course frustrating with pissed off cars behind you). this bike is all OG and only has 20k on it, most of it from me. i got it in 2008 with 9k on it and never had any problems. I do not see any leaks in any lines, cant get it to surge spraying ether around the carb..etc..

youd think if jets were clogged or something it would do it all the time! either its broke or not! ive kept up with oil changes and all religiously. getting super frustrated. Id forgotten this thing could go over 70. well yesterday when it finally broke free it hit 72 in seconds.. i think i once had it up to 78 if im remembering correctly.
when it has its problem it pretty much cant get over 62 especially in a headwind.

i dont detect any rust or water in the gas tank or lines.

ANY guesses??

Thanks in advance!
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Re: she dogs, then flies! intermittent loss of power

Postby zozman » Fri Jun 01, 2018 8:05 pm

kenyrider wrote:...last summer the carbuerator insulator boot was cracked and replaced it....


I suggest you install the 2007 Honda Helix carburetor flange support bracket and related kit as described in another post on the forum. It will stop the carburetor shake that damages intakes.

In regard to your scooter performance, or lack thereof. You obviously have a fuel delivery problem. Either its at the carburetor level or the fuel pump level. Rarely do you get sporatic issues with a faulty fuel pump.

The Honda Helix service manual describes the fuel flow test to conduct to determine if adequate fuel is being delivered by the fuel pump to the carburetor.

The run cold stall warm is indicitive of a faulty autobystarter.

By the time you completely rebuild your 1995 carburetor by adding a new autobystarter, air valve, new jets, float valve and gasket kit, and hope you rebuilt it according to specs, you might have just bought a new Honda Helix carburetor. In fact, You can buy a cheap chinese carburetor for $43. It might give you some improvement but throttle response will suffer. I recommend you NOT buy a cheap chinese clone carburetor but get the OEM Honda one. The PN 16100-KFR-842.

zoz
87 & 98 Helix
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Re: she dogs, then flies! intermittent loss of power

Postby kenyrider » Tue Jul 10, 2018 11:05 am

Hmmm.. yeah i dont think it could be the fuel pump as this has been going on the better part of a year now and it seems like it wouldve just died by now if that were the problem, not work, then not work well x 100.

The auto bystarter may be where i look next, if that needle isnt doing what its supposed to it could explain things. Oddly enough it actually seems to do this problem less after work when its been a cool summer 100 degress, but then when i stop the engine for ten minutes to pick up my kid after driving it for 20, now it will sputter or outright stall when i start it back up.

I also need to take the carb off and look for debris and make sure its all clean. ive now tried seafoam and it looked like it was helping but then nope, back to it. hard to figure out what to throw money at when the scooter isnt worth all that much but its not even to 20k yet, in spite of its age.

this is another theory here and may be in my head but it almost seems at times like i hit a big enough bump and it fixes itself. only thing i could guess there is it IS the bystarter and possibly tats dropping the needle down or up or whatever it does, but its too inconsistent to prove. ive still been riding it every single day and it hasnt killed me but id have thought any gunk in there wouldve burned off this hot summer riding it 15 miles or so each day to and from work. I hate to take it to a shop cuz theyll be all into harleys and blow all sorts of my money figuring out where to start with this thing, or at least thats what i feel.

i did clean and blow air through the filter so its not that thats clogged.
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Re: she dogs, then flies! intermittent loss of power

Postby birdmannn101 » Wed Jul 11, 2018 4:18 am

kenyrider wrote:last summer the carbuerator insulator boot was cracked and replaced it. i took out the fuel filter sponge and cleaned.. not clogged. air filter isnt clogged.

some factors. is that it farts and sputters and backfires when you let off the accelerator.

i got it in 2008 with 9k on it and never had any problems.



Sounds like rust in the tank and/or fuel filter but you say there is NO rust. That would be my first guess.

I have replaced the insulator boot with a Chinese one, only to find out that the hole where the vacuum line attaches was still plugged up with some rubber. Never had this problem with an OEM one.

I don't know what you mean by cleaning a fuel filter SPONGE. I always REPLACE the fuel filter and air filter since it doesn't take much to mess up your day with bits of debree. Farts and sputters is a good sign of air leaking at the muffler and/or insulator boot. A small crack in the insulator boot could ruin your day.
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Re: she dogs, then flies! intermittent loss of power

Postby Av8er » Wed Jul 11, 2018 6:55 pm

Which insulator are you referring too?
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Re: she dogs, then flies! intermittent loss of power

Postby birdmannn101 » Thu Jul 12, 2018 4:51 am

Av8er wrote:Which insulator are you referring too?


The rubber gasket between the carb and the engine.
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