Top Speed 47mph - Page 2 - Honda Rebel Forum
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post #11 of 50 Old 01-27-2017, 12:14 PM
 
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I too have thought of chain Guys on Coleman Collectors Forum often use Sash Chain pictured below..
obtained chainmail used for cleaning cast iron pans works perfect, now I'm thinking inside the tank..
https://www.amazon.com/Knapp-Made-CM.../dp/B0087UYR1S
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post #12 of 50 Old 01-27-2017, 04:45 PM Thread Starter
 
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Today when riding it felt like it had more power but still hard to push over 50mph i need to test it somewhere that's as not to get a ticket haha. I understand that the speedometer isn't %100 accurate but is it off the same amount for everyone or is it more random give or take 5mph sort of thing? I'll test it out later with an app anyone ever use Ulyssee speedometer and how accurate is it?

2000 Honda Rebel CMX250C-C2 Rebel (15k Miles)
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post #13 of 50 Old 01-27-2017, 07:29 PM
 
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I'd check the petcock isn't plugging up when you get low on gas and easier to drain..
check the sediment bowl by unscrewing the bottom of petcock you can check this when valve off, and remove petcock check the internal tank screen...

could also be partial blockage of a carb passage, best to eliminate the easy stuff first..
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96 VS800GL Suzuki Intruder, 87 CMX250C Rebel,
79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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post #14 of 50 Old 01-27-2017, 10:11 PM
 
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Well, I know you probably know this, but since I don't think it was ever mentioned...are you absolutely sure that BOTH spark plugs are firing?

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post #15 of 50 Old 01-28-2017, 02:11 AM
 
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You need to go back and start over again. Don't worry ab out the tank right now. Remove the fuel hose from the petcock, and see if you get good gas flow. If so, you are ready to move on. If not, you need to remove the petcock and check the filter on the inside. It may be plugged up. There is also a removable sediment trap on the bottom of the petcock that should be removed and cleaned. After cleaning everything (I use spray carb cleaner) put it back together, and see what happens. If you now get good fuel flow, time to move on. If not, the last thing you can try is soaking the petcock in Seafoam for a couple of days. If that doesn't work, you are probably looking at a new petcock. Honda petcocks are riveted together and cannot be taken apart.

Once you have good fuel flow from the petcock, you have eliminated that as a problem. Next, install a new (clear if you can find one) fuel line directly from the petcock to the carb, without a filter, and ride the bike. If the performance has not improved, the next step is to remove, completely disassemble and thoroughly clean the carburetor, including all passages. The small E string from a guitar works great for cleaning jets and other small passages. Blow everything out with spray carb cleaner. Wear a face shield to avoid getting the carb cleaner in your eyes. Check the vacuum diapgragm for any holes and make sure it fits properly around the edges. Put the carb back together and hook everything up. Make sure the throttle and choke cables are connected and operate properly. Make sure the fuel line is full of gas. There should be no air pockets. Now ride the bike again. If it STILL does not run right, and if you are sure you cleaned the carb properly, you have pretty much eliminated the fuel system as the problem.

Next, get 2 new NGK spark plugs of the correct type, connect them to the plug wires, but do not install them. Lay them on the engine somewhere so they are grounded. It is best to do this in the shade, so you can see better. Turn the engine over with the starter. Check both plugs. You should get a nice fat blue spark from both. If you do, the only things left to check are valve adjustment and compression. Make sure the valves are adjusted properly, then check the compression. It should be 160 psi or higher. If you did not get a proper spark, repost after doing everything but the compression test. Even though the ignition system on the Rebel is simple, there are a lot of things to check. I don't want to get into all that here if it is not necessary.
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post #16 of 50 Old 01-28-2017, 06:20 AM
 
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Quote:
Originally Posted by JerryH View Post
fuel line directly from the petcock to the carb, without a filter,
I emphatically disagree,, Rebel is notorious for rusted fuel tank..
I understand the intention to test with unrestricted fuel flow, but one does so at the peril of clogging carburetor with contamination..
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79 CB400 Hawk (sold 93), 75 CB350 (sold 83), 71 CB350 (stolen 74)
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post #17 of 50 Old 01-28-2017, 05:33 PM Thread Starter
 
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I pulled one spark plug and it looks rusty i not sure if this is supposed to look like that or not but from what i read tan is good?
The fuel line did have a lot of air in it before i cleared out the filter but its full now.

I did a search on amazon didn't find 2nd gen for NGK but i found two different ver numbers
https://www.amazon.com/NGK-2983-Spar...ywords=cmx250c

and

https://www.amazon.com/NGK-CR6HIX-Ir...ywords=cmx250c

May i assume the NGK CR6HIX is the 2nd gen?

also when i go to plug the spark plug cap back on it feels loose it just doesn't want to fit snug could this also be a problem?
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post #18 of 50 Old 01-28-2017, 06:15 PM
 
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your plugs look serviceable, a little worn.. in a pinch I'd reuse them
but for around $5 for 2 regular plugs new ones would be the next NAPA stop.

CR6HX would work fine if you can find them,, no need to get Iridium version plugs imo
I've have been using Autolight 4194 the last 13 years..

some brands work better in an engine than others..
NGK, Nipon Denso (ND), Bosch, have all worked well for me over the years in foreign engines.
pick a substitute that's readily available.
NGK CR6HS - Alternative spark plugs
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post #19 of 50 Old 01-28-2017, 06:15 PM
 
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That plug looks fine.
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post #20 of 50 Old 01-28-2017, 08:16 PM Thread Starter
 
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hmm okay so i went and pulled the other spark plug out and it had some kind of cover between the spark plug and the boot. It doesn't let me put the boot on the spark plug with the cover over the spark plug lol Did this come from inside the boot it self?
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2000 Honda Rebel CMX250C-C2 Rebel (15k Miles)
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