Rich or Lean - Honda Rebel Forum
 
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post #1 of 5 Old 04-08-2020, 01:44 PM Thread Starter
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Join Date: Apr 2020
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Hey guys, I just recently did a full tune up on my 99, including completely disassembling and cleaning the carb. After re assembly I set the a/f screw to what I believe was 2 3/4 turns out from lightly seated. I've now put about 45 miles on the bike since and I figured I'd pull the plugs and take and look. my question is how exactly do I tell if I'm rich or lean or just right according to my plugs , I'll attach a few photos of my plugs as well, thank you!
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post #2 of 5 Old 04-08-2020, 01:56 PM
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Location: Monroe, Louisiana
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Here's a chart. Spark Plugs

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

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #3 of 5 Old 04-08-2020, 05:56 PM
 
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Funk - How did the bike ride? Was it responsive? Have any running problems?

According to guys who do this, the way to read a plug is to hold the throttle wide open for as long as you can (I guess), then kill the engine, coast to a stop and then pull a spark plug.

I accomplished it a more modern way. See this thread: https://www.hondarebelforum.com/f18/...ng-122021.html

If it rode responsively, your tune is likely good. It's a dynamic affair. Sometimes it's rich, sometimes it's lean, depends on conditions.

2016 Honda Rebel 250 - The "Piglet."
AFR sensor equipped and downsized to a 0.105" main jet.
The only changes so far.
Bought on 6/29/19 with 44 miles.
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post #4 of 5 Old 05-30-2020, 02:33 PM
 
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2 3/4 turns seems a bit rich I would think 1 1/4 - 1 1/2 would be a better range. These engines don't seem to be that fussy, mine ran with nearly half choke for 10 years and I didn't know it, I bought it off the show room that way. I would start with 1 1/2 turns and check the performance and the mileage, burn a tank full then check the plug, it should be a light brown. If you are getting about 60 MPG and it will do 65 - 70 MPH, you are there. If you can operate in that range I would not touch it.
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post #5 of 5 Old 05-30-2020, 05:17 PM
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2 3/4 turns is what Honda recommends for the initial setting on second generation Rebels.

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

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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