06-23-2020, 09:52 PM | #1 |
Join Date: May 2020
Posts: 20
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Bashan motomax - nearly unusable
Bike has 500 miles. Got stranded the past 3 days because of engine bogging in 5th gear at constant throttle. The bike shuts off for about 5-10 min and starts again after that. The second I get up to cruising speed in 5th, it will bog and die again. Anyone know what this could be? I'm thinking it's something to do with the needle in the carb.
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06-23-2020, 11:10 PM | #2 |
Join Date: Nov 2019
Posts: 23
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I’d say you have a carburetor issue. Probably a simple adjustment.
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06-23-2020, 11:33 PM | #3 | |
Join Date: May 2020
Posts: 20
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Quote:
I wonder if I'm running too rich? But if that were the case, wouldn't the problems happen in other gears? This is my first bike, so I'm still learning. Thank you for any help. |
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06-23-2020, 11:43 PM | #4 |
Join Date: May 2006
Location: Yuma, Arizona
Posts: 9,055
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If you haven't already done so, and if you haven't, before messing with the carb, look up how to set the valve lash. These can get pretty tight, and sometimes come tight out of the box.
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06-24-2020, 08:59 AM | #5 |
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Join Date: Oct 2016
Location: Houma, La.
Posts: 11,707
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^What he said ^
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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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06-24-2020, 04:07 PM | #7 |
Join Date: Jan 2020
Location: Vääksy, Finland
Posts: 401
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One thing to check is the tank breather (provided this has one, not familiar with the model)
Sometimes the breather hose can get kinked or clogged and it pulls a vacuum into the tank thus starving the carb of fuel. Wait 10-15mins and the cap seal lets in enough air to fill the bowl, bike starts, rinse and repeat. Next time it bogs down open the fuel cap, if you get a *schup* then that's your problem.
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06-25-2020, 07:33 PM | #10 |
Join Date: May 2020
Posts: 20
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Update: Checked the spark plug (NGK) and it was pretty loose. Didn't even have to break it free, it just turned freely. I feel dumb. Adjusted the valve clearance with a cold engine (had a bit of difficulty finding TDC). Initially, I noticed both were extremely tight with no play whatsoever. Set both to 0.0025". Pulled carb needle housing apart once again, and seated the E clip and the V clip nice and snug (I hadn't pressed the V clip all the way down & flush against the bottom before). Tank breather had no issues. Afterwards, I changed the oil with Amsoil synthetic 20w-50, and saw some speckles in the old stuff with an LED shining at it. Go figure, it started pouring rain here in NE Florida as I was fastening the last fairing. Bummer, but I'll have to wait to ride her after. I did let her idle for about 5-7 min and I noticed the new ticking noise coming from the valves (which I think is good). I'm guessing the ticking will reduce once the engine warms up. Furthermore, upon revving, there is no more high pitched rattle between ~3k-4k rpm like there used to be. Could this be because the valves were too tight before? Feeling pretty optimistic, but the true test will be coasting in 5th for a few miles.
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06-26-2020, 11:30 AM | #11 |
Join Date: Jun 2016
Location: Hell
Posts: 2,408
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06-29-2020, 05:33 PM | #12 |
Join Date: May 2020
Posts: 20
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Update: bike bogged the very next day on my way home from work after all the adjustments. Bummer. But you know what... funny thing is, it poured rain all day while my bike sat in my work parking lot. Come to think of it, it's rained nearly every day for the past couple of weeks here in NE Florida. Thinking back, I'm pretty sure the bike had the bogging issues every single time it got soaked. Could it be possible that water is causing the plug not to spark correctly? Has anyone else experienced problems with a wet/soaking wet bike?
Edit: because I've now let the bike dry for 24 hrs and it runs perfectly fine. It's a beautiful sunny day today. Riding all around town right now for the past hour and no bogging issues whatsoever |
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06-29-2020, 05:42 PM | #13 |
Join Date: Nov 2017
Location: Marseille, France -> Conakry, Guinea
Posts: 1,481
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Check whether your grounds are tight, and make sure to weatherproof your connectors with a good dielectric grease, the rain isn't directly affecting the plug, potentially your coil is getting wet/isn't grounded properly?
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06-29-2020, 05:45 PM | #14 |
Join Date: Jul 2018
Posts: 212
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Rain water shouldn't be able to make its way into the engine, unless there is a leak somewhere or things aren't bolted down well enough. Water can get in through gaps or leaks in hoses, possibly through the airbox or intake into the carb, depending on how your bike is set up. Any way you slice it, you don't want any water getting into your fuel lines, air intake, gas tank, etc. etc. The engine itself is sealed with gaskets and everything else that carries air or fuel to the engine should not provide an entry way for water. You should be able to give your bike a wash with the garden hose and take off right after you're done to help dry the bike off with no water entering the engine. Electrical connections (wire harnesses, brake cables, turn signal wire connections) should all be waterproofed and/or away from water exposure as well.
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2018 RPS Hawk 250cc Mods so far: 1. Mikuni VM26 Carburetor w/#115 main jet 2. 17T/45T JT sprockets 3. JT 428 X-ring chain 4. Air box mod 5. Hawk Digital Cluster 6. Aftermarket IMS shift lever 7. Performance Aftermarket Exhaust 8. 295mm Nitrogen Gas Monoshock, 20W oil front forks |
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06-30-2020, 06:06 AM | #15 |
Join Date: Nov 2017
Location: Marseille, France -> Conakry, Guinea
Posts: 1,481
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Water in the engine won't do that. Period. That's why I offered the explanation that I did. Water getting into the oil (unless it's a huge amount) will evaporate out, and water in the combustion chamber will just clean the combustion chamber, in fact, it's an old trick to decoke an engine to run it while spraying water through a spray bottle directly into the intake.
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