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So sick of this...2hp 77 puch

  • Author: brandon (---.chvlva.adelphia.net)
  • Verified User: improv241
  • Date Posted: 11-08-06 10:41

Poor acceleration and top speed…

I’ve plug chopped – all good
Cleaned tank – clean
cleaned carb – clean
replaced clogged muffler with biturbo – done
replaced old dirty air box with a high flow filter – done

Any other suggestions? I can’t get this ped up to it’s peak condition. I need it to go 25+ at all times and it usually going between 15-20.
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Re: So sick of this...2hp 77 puch

  • Author: mopedmaniac (---.ri.ri.cox.net)
  • Verified User: mopedmaniac
  • Date Posted: 11-08-06 12:57

did you upjet with that biturbo
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Re: So sick of this...2hp 77 puch

  • Author: mkelly (69.12.251.---)
  • kellym
  • Date Posted: 11-08-06 13:31

if the plug chop shows good im assuming he did.

check for sticky brakes, slipping clutch maybe?, loose chain
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Re: So sick of this...2hp 77 puch

  • Author: Cruz (---.tukw.qwest.net)
  • joeyo
  • Date Posted: 11-08-06 15:35

don’t forget to get you’re tires up to good psi, that can make a big difference.
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Re: So sick of this...2hp 77 puch

  • Author: R. (67.139.177.---)
  • jasonf
  • Date Posted: 11-08-06 18:11

Compression test?
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So sick of this...2hp 77 puch

  • Author: brystheguy (---.dyn.everestkc.net)
  • Verified User: brystheguy
  • Date Posted: 11-08-06 21:57

When you say that you plug-chopped and it’s “all good,” what do you mean by that? Not trying to be a jerk, I’m just wondering what you are trying to say. A plug can look “fine” but your moped can still run like crap. Have you played around with airflow at all? Take off the filter so that you have just the intake. As you’re tooling along, reach down and cover part of the intake with your finger. Cover more and less and see what happens. I like to do some troubleshooting this way as it’s quick and you get instant results. Careful as you’re looking down at the carb that you don’t crash in to something though.
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Re: So sick of this...2hp 77 puch

  • Author: brandon (---.chvlva.adelphia.net)
  • Verified User: improv241
  • Date Posted: 11-09-06 01:16

yeah, i upjetted the crap out of it. the stock on a 2hp is 62. I upjetted to a 74. i also moved the needle position down 2 slots to increase gas (like that does much though).
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Re: So sick of this...2hp 77 puch

  • Author: brandon (---.chvlva.adelphia.net)
  • Verified User: improv241
  • Date Posted: 11-09-06 01:17

that’s good. how do you check for sticky breaks and slipping clutch? those could very well be a part of it.
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Re: So sick of this...2hp 77 puch

  • Author: brandon (---.chvlva.adelphia.net)
  • Verified User: improv241
  • Date Posted: 11-09-06 01:17

yeah, they are perfect
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Re: So sick of this...2hp 77 puch

  • Author: brandon (---.chvlva.adelphia.net)
  • Verified User: improv241
  • Date Posted: 11-09-06 01:18

i don’t have the actual meter. but i did the finger test and it’s definitely strong. shot my finger right out of it.
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reply and update (kinda long)

  • Author: brandon (---.chvlva.adelphia.net)
  • Verified User: improv241
  • Date Posted: 11-09-06 01:24

haha, no dude. it’s cool no worries.

What i mean by “all good” is that it gives me a good looking color. I get that not-too-rich brown and isn’t gunked up.

As for airflow, whenever i change it up (covering up the airflow), i always come back to the best run with my current setup. I really feel as though i have the right jetting aka fuel/air ratio coming in right now.

I think it’s clutch or brake issues.

Could be brake because…
It squeaks like crazy
It used to sit outside all the time by previous owner (and ran through camp grounds)

Could be clutch because…
It catches around 15 instead of 10. I would expect it to catch closer to 10 because that’s just what i’m used to.

How do I go about checking both of these?

THANKS A TON ALL
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Re: reply and update (kinda long)

  • Author: CrAzY Hakachukai (---.carolina.res.rr.com)
  • Verified User: crazy_hakachukai
  • Date Posted: 11-09-06 02:36

Have you checked your spark timing?
Spark condition?

What kinda gas are you using? Are you mixing the oil your self? Whats the ratio?

Could you have something blocking the intake circuit in a crazy place that you cant see? (stranger things have happened)

Could it be that your bike is running too rich, even though the plug looks good? I’ve heard that plug chops aren’t all that reliable on mopeds. It makes sense to a certain degree, considering that you are buring both oil and gas as the same time. What if your high oil ratio is masking your low fuel ratio… and vise versa? My spark plug seems to look golden brown no matter what I do.

anyway… just some ideas.

P.S. Bikes that are running rich have a hard time reaching high rpms. I bet if you lean it out litte you’ll see an immediat difference.
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Re: reply and update (kinda long)

  • Author: mkelly (69.12.251.---)
  • kellym
  • Date Posted: 11-09-06 02:54

perhaps you did some piston fiddling and put it in upside down?
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Re: reply and update (kinda long)

  • Author: Nathan (---.suth.com)
  • Verified User: chibichan1701
  • Date Posted: 11-09-06 10:46

I’m amazed no one has mentioned the chain yet. Check that out man, a lousy or rusted chain can wreak havok on your speed. Even having it too tight can drop you down a bit.
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Re: So sick of this...2hp 77 puch

  • Author: Zippy (---.hsd1.ca.comcast.net)
  • Verified User: zippy
  • Date Posted: 11-10-06 01:03

Is your Maxi a 2 speed transmission? If it is a 2 speed it is possible to overfill the transmission and the bike will run really sluggish.

If it is a 2 speed tranny, drain it and refeill with only 9.5 ounces of ATF type “F”. DO NOT top it off.
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Re: So sick of this...2hp 77 puch

  • Author: Prancer (---.proxy.aol.com)
  • Verified User: prancer
  • Date Posted: 11-13-06 13:12

From the way you described it’s actions, it would seem to be something with the carb, though from what you’ve said it’s fine. I think you should lean it out a little. It sounds to me like you might be getting too much fuel. Don’t count on the plug to be right all the time.
Also, you might consider the electrics on your bike. I had a Targa that would bog and die simply because one of the turn signal contacts was grounding out on the headlight housing. It might be a simple coincidence that it’s bogging in a certain place. Vibration can cause a lot of electrical issues if something’s loose or out of place.
Look over the entire bike, and make sure to blow out every single opening on that carb. Take down the cylinder too. Look in all the ports and things. Carbo build-up can cause a lot of issues. That’s for sure. Good luck man.
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Re: So sick of this...2hp 77 puch

  • Author: huffypuffy (---.dhcp.aldl.mi.charter.com)
  • Verified User: huffypuffy
  • Date Posted: 11-15-06 17:00

did you check for air leaks with starting fluid while it was running? And what zippy said about overfilling the trans—I did that once on a franco morini and couldnt get up to 15, then drained about 1.5” out and went 35. And that was even on a 1 speed.
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Re: So sick of this...2hp 77 puch

  • Author: Arran (---.gv.shawcable.net)
  • Verified User: arran
  • Date Posted: 11-15-06 21:15

Don’t forget to check the ignition timing. My Motobecane 40 was slow, hard to start, and gutless going up hill. It turned out that the ignition timing was retarded and after it was reset it went like a bat out of hell.
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Re: reply and update (kinda long)

Brandon,you say that it squeaks like crazy and that the last owner ran it through camp grounds etc.then I think it could be brakes or wheel bearings.If the guy rode through water a lot the brake arm pivots can be stiff or siezed and the wheel bearings rusty.First just walk with the bike with the chain off,is it easy,does it squeak or grab suddenly?If so disconnect the brake cables and try to move the brake actuators by hand,if they bind or dont return easily then you will have to take the wheels off and careully dismantle the brakes.Drive the actuator pivots out and clean and grease lightly,an auto parts store should have special brake grease but copper grease will do.If all is well with the brakes then check the wheel bearings,again turn them by hand,they should spin freely with no binding or play and should be rust free.If not replace them.TIP dont just drive them out,this wears the hubs,heat them up evenly with a hot air pistol or old flat iron and they will pretty much drop out,same applies putting new ones in.By the way dont buy bearings from moped shops I always buy from specialist bearing shops they are usually cheaper and better quality,same aplies to engine bearings.Now good luck Jerry
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Re: reply and update (kinda long)

  • Author: Graham (---.dsl.euclwi.sbcglobal.net)
  • Verified User: mobyman
  • Date Posted: 11-22-06 15:38

do you have engine oil in the transmission or something? The clutch could be slipping from that.
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Re: reply and update (kinda long)

  • Author: tim (---.mad.east.verizon.net)
  • Verified User: electrica1
  • Date Posted: 11-23-06 11:24

how many times do i see a post like this one. alot. I say check the banjo fitting on the bing carb. they always get cloged (small screen) because no one cleans them!
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