11-29-2022, 05:15 PM | #1 |
Join Date: Sep 2019
Posts: 69
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Hard start. Won't idle without stalling. Backfire.
Back again... I'm getting really redacted sick of this bike right now. I've had more issues in the last 2 months than I've had over the last almost 3 years of ownership....
Rundown of what's going on... Bike was hard to start today, temperature wasn't the issue because I've started right up in much colder than todays 55F.. Had to kickstart, figured battery was low on juice. But seemed to idle fine at this point. Head out and less than quarter mile into the journey I noticed a little bit of stuttering. But I didn't think too much into it at the time. When went to jump on the bike to get home I again couldn't electric start, but kicked it a couple times and it turned over. This is where the issues really started... As I was going to leave the parking lot the bike stalled and I struggled to get it started again over the next 10 - 15 minutes, battery had also started beeping, so it's low.. The bike wasn't staying at idle without giving throttle, but no backfire yet. Took backroads so I didn't have to stop and risk stalling it again. At home I pull the plug, didn't see any problems with it but changed out anyway. Again could barely get it started and was still stalling and now I've got backfire as well. Pulled the pod filter off and put the airbox back on to see if maybe that's causing some weird problem, but nope, same thing. A side note; over the last couple of days I felt power loss around 4th gear where it wasn't climbing like it used to. But those were colder days. TL;DR: Bike hard to start (electric & kick). Stalling at idle. When giving throttle at idle to keep running it backfires. Sputtering. Recent power loss in 4th and 5th gear. 2020 TBR7 |
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11-29-2022, 05:20 PM | #2 |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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When was the last time you checked the valve lash?
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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11-29-2022, 05:38 PM | #3 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,625
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Personally, I am no TBR7 fan (we had major issues with frame build quality, and components, but NOT the engine which actually ran great).
But Jerry is right. You need to methodically go through the standard maintenance procedures. And tell us what you did..... -Valve adjustment is easy on this engine. Take your time and make sure that is good. Many posts on this for the 167FMM CG clone. -You also didn't tell us what you've done to the carb. -Any other mods? These two might be the top of the list for you to either address. Third is mods you might have. Really. Valves are important, and the carb is right behind. Otherwise, these little engines are pretty bulletproof. |
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11-29-2022, 05:45 PM | #4 |
Join Date: Sep 2019
Posts: 69
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It's been quite awhile since I checked valves. I was going to do that back in August-Sept when I had a different issue. But that problem resolved itself overnight.
The more I'm thinking about it now, this does have a lot of valve adjustment symptoms. Didn't think it would cause a completely no start though. I spent another 15 minutes just now trying to kick it only cranking over once for a couple seconds. |
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11-29-2022, 05:51 PM | #5 | |
Join Date: Sep 2019
Posts: 69
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Quote:
Mods list: Nibbi PE28 40 pilot, 120 main jet. Pod filter or Airbox. have used both on this carb. CDI Box. Battery upgrade. Irrelevant stuff like handlebars, grips, mirrors, headlight bulb, turn signals. |
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11-29-2022, 05:53 PM | #6 |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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If you installed one of those so called performance CDI boxes I would go back to the stock CDI and test that too. But definitely do the valves before anything else.
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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11-29-2022, 06:01 PM | #7 | |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,625
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Quote:
Bottom line, take the time and make certain that your valves are adjusted. There are TWO of them. Easy Peasy!!! The carb settings sound reasonable, but I never bothered to replace my perfectly good original carbs on any Chinese bike, and I can't offer any opinion on that. |
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11-29-2022, 06:07 PM | #8 |
Join Date: Sep 2019
Posts: 69
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The previous problem was an issue after riding in heavy rain. Bike stalled as I got home and wouldn't start back up. Let it sit overnight and it started and ran like normal the next day. Last edited by Slug; 11-29-2022 at 06:43 PM. |
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11-29-2022, 09:32 PM | #9 |
Join Date: Jul 2022
Posts: 94
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Use a spark checker to see if you are visually getting a consistent spark. I have seen small engines that sheared the flywheel key and the flywheel is out of place and sparking at the wrong time backfiring and hard to turn over. Rare but possible.
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11-30-2022, 03:19 AM | #10 | |
Join Date: Sep 2019
Posts: 69
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Quote:
I'm so glad I kept the old CDI instead of tossing it. Put the stock one back in and guess what...? The bike started right up no problems and idled fine. On the next warmer day we get here I'll dig into the bike to adjust my valves just to make sure that's not an issue anytime soon. I want to thank you so redacted much for saving me such a headache. I've been losing my mind over how many issues I've had lately. |
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11-30-2022, 10:39 AM | #11 | |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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Quote:
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2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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