Bike dies with throttle applied - Honda Rebel Forum
 
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post #1 of 6 Old 09-13-2019, 11:43 AM Thread Starter
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Bike dies with throttle applied

I have a 2008 Honda Rebel that I just bought in rough shape. I'm in the process of getting the bike back up and running right. I have already fixed a few of the electrical issues but now i'm dealing with the bike dying when throttle is applied. I have cleaned and re-built the carbs 2 times now. First time i cleaned it out with carb clearer and the 2nd time i used the Berryman's Chem Dip solution for 24 hours. When I bought the bike it ran but very rough due to the exhaust being chopped off but it ran enough to ride it around the block. Now after cleaning the carbs it will not stay running when i apply throttle at all. It will idle rough and start up fine with the choke applied about 1/2 - 3/4. I have looked for a intake leak with spraying carb cleaner around the carb while it was running but it is not running smooth enough that I could notice a change when spraying carb cleaner around the intake seals. Any ideas as to what would cause this issue? Thanks!
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post #2 of 6 Old 09-13-2019, 12:45 PM
 
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most (if not all dips) are worthless these days imho..
there was a time carb bodies came out of dip looking like new and my fingernails softened to a rubber consistency when immersed.. Not any longer with less caustic chemicals used today..
I'd suggest soaking several days, agitate bucket and rotate carb body during soak period..
rotating carb body in solution allows cleaner to displace air trapped inside the many small internal passageways
Or use an ultrasonic cleaner..

Sounds like the Accelerator pump isn't doing it's job enriching mixture coming off idle..
Two possibilities, the accelerator diaphragm is damaged or the check valve isn't sealing properly.. Check Here for reconditioning PDF of accel pump check valve..
Least expensive diaphragm I have found that works, though the rod needs to be cut to length... Another source for Accel pump..
or spend the big bucks and buy complete assembly 16021-KEN-620 Pump Diaphragm set..

96 VS800 Intruder (sold 2018 ), 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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post #3 of 6 Old 09-13-2019, 12:53 PM Thread Starter
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Soaked, thanks for the quick reply. Would an ultrasonic cleaner help with the accel pump check valve if that was the issue? When i looked over the accel pump diaphragm it looked good with no obvious signs of cracks or damage.
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post #4 of 6 Old 09-13-2019, 01:32 PM
 
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I'd think a ultrasonic cleaner would be better than just soaking..
Being Old school i've never used ultrasonic, though have thought of buying one..
everyone who has one swears by it..

Retired from working in auto/truck shops in 90's, much has changed in the last 2 decades..
Now I set the bucket where each time going outside I rotate entire bucket half a dozen times and reach in once a day to flop the parts around.. Think my last soak several years ago (gotta be near 10 years) lasted 5 days..

So seldom have need to rebuild carbs or clean other small parts can't justify buying a cleaner.. last few years restoring antique oil lamps has been my focus..
Interesting science in air/fuel delivery ratios in itself.. especially when it comes to wick fed mantle lamps..
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96 VS800 Intruder (sold 2018 ), 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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post #5 of 6 Old 09-13-2019, 01:39 PM Thread Starter
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Thanks, after reading more about the accel pump and the cleaning doc you posted. I'm heavily leaning towards the pump cap passages being blocked. I'm going to strip it down again and re-soak the cap portion and test the flow before putting it back together fully. If the soak doesn't clean it out I can send it to a buddy who has an ultrasonic cleaner. I appreciate your time and help!
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post #6 of 6 Old 09-13-2019, 01:46 PM
 
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I assemble the pump to bowl, 1/4" gas added and pump while watching for push back of fuel into bowl while thumb is over exit port in upper lip of bowl...

Use Care, pumping can squirt gas several inches into air out exit port..

96 VS800 Intruder (sold 2018 ), 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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