HELP, need the genius squad!! - Honda Rebel Forum
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post #1 of 39 Old 03-13-2016, 08:16 PM Thread Starter
 
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HELP, need the genius squad!!

My 85 250 has a new tank and Honda petcock, pro-rebuilt carb (last Oct,) I run Shell high test, Castrol GTX 10w40, new air filter, new plugs (Left running a bit lean, right nice and tan.)

THE PROBLEM: With no predictable repeat ability, when crusing on a hold pattern from 35 to 45 or so it will suddenly flatten out on mild acceleration, with no throttle control, and hold it's speed but at least at half power for 1/4 mile to a few miles.

Happens anytime...first AM ride, late in the day after many prob-free miles, cold or hot weather.

Thanks in advance.

“How people treat you is their karma; how you react is yours.”**– Wayne Dyer

1985 Black and Red 250 #5688

2033 Multipearlized XJ10 Hoverbike
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post #2 of 39 Old 03-13-2016, 08:26 PM
 
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That is sounding like the CDI, (ignition control module) and brother that is just a guess.

1986 Honda Rebel 450 28,000 miles
1987 Honda Rebel 450 5,000 miles (sold)
2009 Honda Rebel 250 8,000 miles
1983 Honda CX 650 twisted twin 6,000 miles
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post #3 of 39 Old 03-13-2016, 08:38 PM Thread Starter
 
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Quote:
Originally Posted by Old School View Post
That is sounding like the CDI, (ignition control module) and brother that is just a guess.
Thanks, ran that past the mechanic at Musselman Honda here in Tucson and he just said he didn't think so because in his op it wouldn't be sporadic??

I had 5 wrong diagnosis' from the VA since 2010 so I am skeptical about the so-called "pros" know what I mean?

“How people treat you is their karma; how you react is yours.”**– Wayne Dyer

1985 Black and Red 250 #5688

2033 Multipearlized XJ10 Hoverbike
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post #4 of 39 Old 03-13-2016, 08:46 PM
 
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I do know what you mean about the "pros"
The problem with CDI's is the can be heat sensitive, I have see the CDI's do all kinds of things before they quit completely.
It is very unlikely the carb would malfunction and then straighten out only to malfunction again.
If the CDI does not advance the ignition timing all the way to full the engine will have very little power while that is happening.

1986 Honda Rebel 450 28,000 miles
1987 Honda Rebel 450 5,000 miles (sold)
2009 Honda Rebel 250 8,000 miles
1983 Honda CX 650 twisted twin 6,000 miles
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post #5 of 39 Old 03-13-2016, 11:58 PM Thread Starter
 
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Quote:
Originally Posted by Old School View Post
I do know what you mean about the "pros"
The problem with CDI's is the can be heat sensitive, I have see the CDI's do all kinds of things before they quit completely.
It is very unlikely the carb would malfunction and then straighten out only to malfunction again.
If the CDI does not advance the ignition timing all the way to full the engine will have very little power while that is happening.
Guess you have replaced one then? What sort of ballpark $ might I expect to order one?
Yeah, a 31 year old CDI (far as I know) good chance it might be on its last leg.
Thanks a lot OS.

“How people treat you is their karma; how you react is yours.”**– Wayne Dyer

1985 Black and Red 250 #5688

2033 Multipearlized XJ10 Hoverbike
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post #6 of 39 Old 03-14-2016, 12:23 AM
 
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See if this sounds similar:

http://www.hondarebelforum.com/f76/m...0-a-60025.html

tl;dr a cheap Chinese clone CDI off Amazon fixed my problem.

1987 Rebel 250. 60K miles. Ex-school bike.
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post #7 of 39 Old 03-14-2016, 01:55 PM
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Had a '86 450 do the same thing. Run great for awhile then no power and then fix itself.
Tried everything I could think of. I got a replacement CDI from Jacks in Florida and it fixed the problem.
Electrical problems will drive you crazy sometimes.

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post #8 of 39 Old 03-14-2016, 10:43 PM Thread Starter
 
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Quote:
Originally Posted by sedwards View Post
See if this sounds similar:

http://www.hondarebelforum.com/f76/m...0-a-60025.html

tl;dr a cheap Chinese clone CDI off Amazon fixed my problem.
Thanks, good advice from flitecontrol. Yeah, gonna Amazon/ebay it for a CDI.

“How people treat you is their karma; how you react is yours.”**– Wayne Dyer

1985 Black and Red 250 #5688

2033 Multipearlized XJ10 Hoverbike
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post #9 of 39 Old 03-14-2016, 10:49 PM Thread Starter
 
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Quote:
Originally Posted by jax View Post
Had a '86 450 do the same thing. Run great for awhile then no power and then fix itself.
Tried everything I could think of. I got a replacement CDI from Jacks in Florida and it fixed the problem.
Electrical problems will drive you crazy sometimes.
Strange ain't it?? My fault for not forcing the Honda dealer to check out my CDI with a timing test :-/ $75 for a new petcock and install was as close to being beat up as I wanted to get. I was on the road (home now) and at their mercy since I only had my camper van and few tools and no where to work on it.

Yeah, electrical probs are nothing for some of these guys here but for me it is a foreign language.

I'll come back with a followup when I get my CDI. I knew the genius bar was jumping

“How people treat you is their karma; how you react is yours.”**– Wayne Dyer

1985 Black and Red 250 #5688

2033 Multipearlized XJ10 Hoverbike
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post #10 of 39 Old 03-15-2016, 01:19 AM
 
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You can get 3 packs for like $10 on ebay. I got 3 and the one I put in my scooter is doing fine.
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