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Author Topic: Hi everyone  (Read 1224 times)

Offline norn

  • Posts: 6
Hi everyone
« on: Oct 25, 2017, 04:39:07 »
Hey guys and girls, I'm a 23 year old Ace 125 owner in Albany, Western Australia, Australia. Aprox. 10 000 km on the clock. Long time reader (I was inspired to buy one originally when reading the "Bike in a box" thread), thought I'd finally make an account.

I'm currently just an owner and unfortunately not a rider. After having it hotwired, stolen, recovered, and completing numerous electrical repairs, I thought I finally had it sorted. Then, as I was exiting a freeway (travelling approx 80 km/h) and slowing down in the slip lane, it suddenly lost power and stalled. Plenty of fuel, petcock fine, so I tried starting it a ~50 times, but not so much as a whimper. I do the walk of shame the rest of the way to work, and then all the way home in the evening.

Eventually I muster the courage to start trying to fix it. Cleaned the carby, checked the air box, running fine, and idling! Very proud of myself. Take it out, get up to 80, and then the same power loss again, except it doesn't quite stall and I'm able to limp it home. I let go of the throttle and it stalls.

I replaced the carby with another fake Mikuni. Running fine, and idling, again! Exact same thing happens again when taken up to speed.

Took off the exhaust this afternoon to check for wasps nests, no problems that I can see. Ran it with the exhaust disconnected for a while, seemed happy at first, but then black smoke and a stall.

Am I missing something obvious? Is there something I should be checking?

Thanks for reading,

norn

Offline stroker crazy

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Re: Hi everyone
« Reply #1 on: Oct 25, 2017, 05:15:49 »
Got my thinking-cap on but haven't been struck by a brilliant solution yet!

Does it continue to run if you don't go over 60-70?

(It's not a good idea to run it without the exhaust)

Crazy
“Ride like the Wind” W.H.

Offline norn

  • Posts: 6
Re: Hi everyone
« Reply #2 on: Oct 25, 2017, 06:02:58 »
Thanks for your mental energy, crazy!

I didn't quite explain myself properly. When I get the revs up high, then it's as if a switch is flicked that stops it from running correctly, and it won't be able to idle etc. The way to "unflick" the switch seems to be to completely dismantle and clean the carby, or replace it, at which point it will seem to work properly until it's revved high again.

(I put the exhaust back on :) )

norn

Offline stroker crazy

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Re: Hi everyone
« Reply #3 on: Oct 25, 2017, 07:46:42 »
Next time you take it for a ride take a plug spanner with you.

Pull the spark plug immediately after it dies to see if it oily or dry or whatever. What sort of plug are you using?

Double check the electrics for good earths, no shorts etc.

Crazy
“Ride like the Wind” W.H.

Offline r4g5

  • Posts: 51
Re: Hi everyone
« Reply #4 on: Oct 25, 2017, 12:45:37 »
Does it happen when the engine is hot and cold? I'm just wondering if it's revs or heat? I've been doing my valve clearances (with the help of crazy) recently so it's on my mind. If there is little/no valve clearance then it could affect performance at higher revs on a hot engine.
My first thought though was needle jet getting stuck but if you changed the carb then guessing it can't be that...good luck

Offline Racing Ruben

  • Posts: 57
Re: Hi everyone
« Reply #5 on: Oct 25, 2017, 13:00:57 »
I once had a similar problem with a cg125.  After riding it for a while it kept on stalling.  It was the fuel tank that sucked itself vacuum so the fuel stopped going to the carb.  Maybe a long shot....
Good luck

Offline stroker crazy

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Re: Hi everyone
« Reply #6 on: Oct 25, 2017, 18:26:07 »
It was the fuel tank that sucked itself vacuum so the fuel stopped going to the carb …

Could be!

A lot of 'Ace' fuel caps leak - maybe this one seals too well.

Crazy
“Ride like the Wind” W.H.

Offline norn

  • Posts: 6
Re: Hi everyone
« Reply #7 on: Oct 25, 2017, 23:28:17 »
Thanks so much for all the advice guys!

Crazy:
Quote
Next time you take it for a ride take a plug spanner with you.

Pull the spark plug immediately after it dies to see if it oily or dry or whatever. What sort of plug are you using?

Double check the electrics for good earths, no shorts etc.
Thanks Crazy, I'll do that. I'm using a stock plug, NGK, I think I'll buy a replacement and see if that helps. I really hope it's an electrical problem.

r4g5:
Quote
Does it happen when the engine is hot and cold? I'm just wondering if it's revs or heat?
Well, when I start it cold, it seems to be able to idle OK, but it starts creeping into a stall as it warms up (I thought this was to do with the idle screw, but you've got me thinking there may be more to this).
Quote
...but if you changed the carb then guessing it can't be that...
Yeah, I thought the same, but after changing that all over, I agree.

Racing Ruben:
Quote
It was the fuel tank that sucked itself vacuum so the fuel stopped going to the carb...
Thanks Ruben, no danger of that: when I refuel, I have to decide in advance how far I want to travel, and how tightly I want to be cornering (i.e. how much fuel I want to slop on my legs). A niiiiice loose "seal" for me.

EDIT: typo

Offline r4g5

  • Posts: 51
Re: Hi everyone
« Reply #8 on: Oct 26, 2017, 02:26:33 »
I'd try opening the choke when it begins to stall and see if this has any effect...mine had running issues at temp, tried this. It ran better so I knew the mixture screw had to come out a bit. Would be weird that you're getting the same symptoms on two carbs though

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Offline norn

  • Posts: 6
Re: Hi everyone
« Reply #9 on: Oct 26, 2017, 03:52:44 »
I'd try opening the choke when it begins to stall and see if this has any effect...mine had running issues at temp, tried this. It ran better so I knew the mixture screw had to come out a bit. Would be weird that you're getting the same symptoms on two carbs though

Yeah, opening the choke near a stall keeps it alive. I'll try messing with the mixture.