New rebel 250 guy here , 67 mph engine cuts off - Page 2 - Honda Rebel Forum
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post #11 of 29 Old 08-19-2019, 04:21 PM Thread Starter
 
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Well tested with cap off. Ran better up to 70. Backfire now won’t go past 50. Lol no rpms in each gear. Maybe back to CDI change?
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post #12 of 29 Old 08-19-2019, 05:17 PM
 
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Believe you said a CDI was coming.. couldn't hurt to swap it out..
Skeptical that it will cure problem, wouldn't be the first time I was wrong..

tend to feel it's fuel supply and/or carb related.. online diagnostics are rather arbitrary, so I'll be watching for the outcome.. Keep us informed

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post #13 of 29 Old 08-19-2019, 05:19 PM Thread Starter
 
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Originally Posted by SoakedKarma View Post
Believe you said a CDI was coming.. couldn't hurt to swap it out..
Skeptical that it will cure problem, wouldn't be the first time I was wrong..

tend to feel it's fuel supply and/or carb related.. online diagnostics are rather arbitrary, so I'll be watching for the outcome.. Keep us informed

Going to borrow CDI off non ca rebel and try tonight lol but yes it’s coming , of this isn’t it , going to have to take care somewhere . I don’t mind electrical but carbs scare me . To many little parts lol
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post #14 of 29 Old 08-19-2019, 05:37 PM
 
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All CDIs from 2nd generation 1996 through 2016 rebels will interchange..
if that swap fails check the screen inside tank.. no need to remove tank, just drain into container, unscrew nut at base of petcock.. there is a sediment bowl attached to the bottom of petcock that should be cleaned out as well...

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 #15 of 29 Old 08-19-2019, 09:45 PM Thread Starter
 
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Well replaced CDI, changed plugs and took pitcock off and drained gas . Won’t go past 50 wot. Looks like carb issue 🏻 Have to call local shop and see if he does carb work . Main jet issues maybe?
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post #16 of 29 Old 08-19-2019, 10:46 PM Thread Starter
 
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Also thinking diaphragm tear maybe . Can I get to this without pulling carb
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post #17 of 29 Old 08-19-2019, 10:59 PM Thread Starter
 
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Checking it over I noticed rear of carb isn’t connected to air box. Would this cause no top end and bogging ?
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post #18 of 29 Old 08-19-2019, 11:16 PM
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You bet it would! Kinda surprised it ran that well. Think you've found the problem. Looks like the clamp came off.

Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #19 of 29 Old 08-20-2019, 06:18 AM Thread Starter
 
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You bet it would! Kinda surprised it ran that well. Think you've found the problem. Looks like the clamp came off.
Too much air ? I’m hoping that’s it . We will see .
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post #20 of 29 Old 08-20-2019, 11:50 AM
 
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I'd be concerned road grit is causing vacuum piston to bind..
Hard to tell how long unfiltered air has been entering carb..
Remove air filter, press on outside of rubber duct so it folds into itself, deformed into somewhat of a C and shove duct lip into air box.. little lubricant WD40 or silicone helps.
At that point you should be able to lift vacuum piston with finger and feel binding is there is any..

You could also check piston operation while engine running.. may need to use cell phone camera to video rise and fall as throttle operated..

if piston raises fully w/engine running at higher RPMs torn diaphragm would seem unlikely to me..

With duct pushed inside air box, 1/4 of the work to remove carb has been accomplished should you decide to have it gone through...

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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