10-24-2020, 04:28 PM | #1 |
Join Date: Feb 2020
Location: Los Angeles, CA
Posts: 10
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BD125-8 Shuts Down between 5-6k rpm
This thing is driving me nuts. Idles and revs and holds fine in neutral, but once in gear and hit 5000 rpm looses all power. Will even shut off. I've had to ride home at 3000 rpm. Replaced CDI and coil. Checked timing which appeared to be a tooth off. Even swapped carbs. Anyone experience this or have an idea?
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10-26-2020, 08:08 PM | #2 |
Join Date: Feb 2020
Location: Los Angeles, CA
Posts: 10
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Nobody has had this experience? It's driving me crazy! There's not too many parts left I could replace on the bike to troubleshoot and it's still running like shit. I'm so tired of working on the bike, I just want to get it running properly so I can sell it and buy a Honda. This thing is junk.
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10-26-2020, 08:25 PM | #3 |
Join Date: May 2018
Posts: 1,638
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any Chance your cdi has a rev limiter in it ? If it’s a generic one from an atv or a smaller kids bike that might be how it was set up
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10-26-2020, 08:32 PM | #4 |
Join Date: Feb 2020
Location: Los Angeles, CA
Posts: 10
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it does not. It started doing this even with the old cdi, which i now assume is still good. Doing wheelies with the crew and it started cuttting out in wheelies and on both wheels as well.
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10-28-2020, 02:04 PM | #5 | |
Join Date: May 2006
Location: Yuma, Arizona
Posts: 9,055
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Quote:
https://www.kronikracing.com/
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"They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard |
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10-28-2020, 06:21 PM | #6 | |
Join Date: Feb 2020
Location: Los Angeles, CA
Posts: 10
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Quote:
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10-29-2020, 10:38 AM | #7 |
Join Date: May 2006
Location: Yuma, Arizona
Posts: 9,055
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I know that people have, in the past, suggested using aluminum cans as a feeler gauge (I forget what its thickness is), but that was for vertical singles as found in the dual-sports, and I think the gap was fairly close depending on bike's engine brand (usually Zongshen 2xx cc vertical thumpers). Not to mention, it seems that every single brand has their own intake and exhaust gap specs, so I guess using cans would be more for stuck on the side of the road valve lash adjustment, lol. BTW, what are the specs for these engines?
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"They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard Last edited by culcune; 10-29-2020 at 11:41 PM. |
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10-29-2020, 05:18 PM | #8 |
Join Date: Nov 2019
Posts: 99
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Is any of the emissions stuff disconnected? If not, check all your vacuum lines and tank vent. If it is disconnected, try hooking back up. Try removing the fuel filter and running straight to the carb. Just my .02
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11-10-2020, 12:57 AM | #9 | |
Join Date: Feb 2020
Location: Los Angeles, CA
Posts: 10
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Quote:
According to TBoltUSA https://tboltusa.com/store/tech.php?...%2C+and+Timing |
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11-10-2020, 01:05 AM | #10 | |
Join Date: Feb 2020
Location: Los Angeles, CA
Posts: 10
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Quote:
I'm convinced there's something electrical going on here. I noticed my led light kit reboot when I pressed the starter button the other night. CDI, coil and V/R have all been replaced. I have a new battery arriving tomorrow. Process of elimination lol. |
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11-10-2020, 08:29 AM | #11 |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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Just throwing this out there but seen it before on here. Are you using a resister spark plug with a resister coil wire cap? That will cause a weak spark.
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