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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your engine and what needs to be done to achieve top performance.

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  #1  
Old 12-14-2016, 08:26 PM
crassius crassius is offline
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Default I hate it when they do this.

Putting miles on my new test bikes lately (when repair jobs & weather permit) and one quit on me today. Was pulling up a hill fairly aggressively when it started missing a bit & loosing power, then quit about 100 feet farther up the hill. Looked it over well, saw nothing, checked wiring, unplugged kill wires. Pushed it to top of hill and came down, and it started again. Ran a bit crappy with intermittent missing back to shop.

Drained carb into glass jar to look for water as I had added fuel before starting out, but didn't see anything - checked all and reconnected wires.

Rode around for a couple miles with no problems.

Now, if I never figure out what happened, will I trust it on a long ride?

Troubleshooting after the fact just kills me.
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Old 12-15-2016, 05:13 AM
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ZipTie ZipTie is offline
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Default Re: I hate it when they do this.

Steep hill and sputtering out...float issue maybe from the angle?
Zip
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Old 12-15-2016, 08:41 AM
curtisfox curtisfox is offline
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Default Re: I hate it when they do this.

Sounds like bad gas to me, run fine after you put new in.Or like Zip said, float angle...............Curt
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Old 12-15-2016, 12:21 PM
crassius crassius is offline
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Default Re: I hate it when they do this.

yeah, might have been a water drop that went thru so wasn't seen when I drained carb - this is one of two identical bikes, so float angle shouldn't be it unless the carb has a flaw - also might have been a funny spot on wire connector that rubbed clean when I replugged them

I can only pedal 1/2 a block and only walk a bit less than 3 blocks, so I'm a bit nervous about trying a long ride : (

Just hoping running it a while around the near area will show what's wrong or show that it is OK now.

EDIT: I should also note that this bike has been up that hill three times before during testing with no problems.
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Last edited by crassius; 12-15-2016 at 01:59 PM.
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Old 12-15-2016, 10:09 PM
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sbest sbest is offline
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Default Re: I hate it when they do this.

I had an XT600 that I bought brand new in 1985.
Rode it 1 year, which was the warrantee period when it started shutting down for no reason. Would shut down for a couple seconds, then start back up. It got worse with time.

It got so bad that as I gunned it out into traffic it would quit and toss me over the handle bars, and THEN it fire back up flinging me back on the seat! Not safe at all.

The dealer was good about it. It rarely ever happened at the dealership. They only charged me for the parts tried and minimal labour for what would be servicing anyway.

Finally they found it. Protective varnish coating inside the steel gas tank was breaking down causing almost invisible scales that would block off the petcock filter. Shut the gas off or shake the tank and the fuel would flow again. They pulled the petcock filter and installed an inline filter.


(stock photo identical bike)
100mph dirtbike
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Old 12-16-2016, 09:27 AM
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ZipTie ZipTie is offline
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Red face Re: I hate it when they do this.

If you think about how small the hole is in a carb jet any micro gunk can clog em if even temporary. I would imagine Crassius that you remove and toss the upper petcock gas filter? I have been tossing mine, for good or bad? What do you guys recommend on the little petcock filter????
-sbest, I had a meager 1972 YZ125 Yamaha dirt bike when I was a kid that had so much torque and compression it would rip the spokes clean off the rim and blast so hard with a blip of the throttle and when it kicked in after a one moment delay I needed a death grip on the bars. Those old 2 strokes were scary fast and fun. I could only imagine a 600cc 2 stroke. I would sure like to have one again.
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Old 12-16-2016, 12:31 PM
crassius crassius is offline
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Default Re: I hate it when they do this.

I like both filters - tank filter protects rubber in the petcock, and line filter protects carb when rubber from petcock begins to shred with age.
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Old 12-16-2016, 02:32 PM
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Default Re: I hate it when they do this.

That is too funny Crassius... but full circle protection. Ever had or seen a tank filter clogged?
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Old 12-16-2016, 03:45 PM
crassius crassius is offline
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Default Re: I hate it when they do this.

yes, just blew thru it and replaced
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Old 12-29-2016, 04:19 PM
crassius crassius is offline
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Default Re: I hate it when they do this.

well, bad weather lately had me doing only short rides on it, with no problems

today, it quit at same place on same hill - hit tickler and couldn't tell about gas flow, so opened gas cap - started right up

rode some on level road and started to spit & sputter, opened gas cap and no change, still rolling so hit tickler, no start

got off and looked without touching anything, started up fine after a min

got to shop, checked fuel flow, checked wire connections - rode a bit & it quit again on level road at moderate speed

when it runs, it runs smooth and fast - always sputters a bit before quitting - always starts right up after about a minute - never quits on the run-bench

beginning to hate this POS
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