New exhaust and jetted carb - Honda Rebel Forum
 
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post #1 of 7 Old 09-06-2019, 07:37 PM Thread Starter
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New exhaust and jetted carb

Recently piped and jetted my 85 rebel 250 now anything past about half throttle it wants to bog an pop, let out of it and clears up till i try to accelerate. Diaphragm looks good any suggestions?
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post #2 of 7 Old 09-06-2019, 08:31 PM
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Welcome to the forum. What type exhaust and jets did you use? Did you happen to go by the recommendations here: Jet Kit Calculator Techincal - Jet kits for Carburetors

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 7 Old 09-06-2019, 08:39 PM Thread Starter
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Yes i went to carbjetkits.com put jardine slash cut de baffled with a pod air filter it called for two shims on the needle and a 148 main and a 40 pilot
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post #4 of 7 Old 09-06-2019, 08:41 PM Thread Starter
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Was thinking about taking carb back off an removing one shim and see if that helps
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post #5 of 7 Old 09-06-2019, 08:59 PM
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The popping/backfiring is due to an overly lean condition. Rejetting is a trial and error experience.

You probably put a small pod filter on the crankcase breather hose. Be aware that the inside of the filter can become blocked by oily goo, resulting in too much internal pressure which will blow out the left side oil seal

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 #6 of 7 Old 09-06-2019, 09:16 PM Thread Starter
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I just put the filters on their brand new and it loses power and starts popping over half throttle idles perfect starts perfect easy acceleration it runs perfect just hard acceleration is when it starts having issues
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post #7 of 7 Old 09-09-2019, 11:58 AM
 
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85 - I suggest that you watch and/or contribute to this thread. https://www.hondarebelforum.com/f76/...fr-122445.html


It sounds like your issue is with your main jet selection based on how you describe when your problem occurs. My bike is stock, and runs very well. With everything stock, at WOT, my bike is rich. Way rich. It is about 19% richer than 12.5:1. And at 12.5:1, it remains rich (and safe). And mine stock, is way richer than 12.5:1. 12.5:1 is very safe, and is the AFR that produces maximum WOT power with gasoline. Mine is running about 10.5:1, at best at WOT. When I first whomp it (below redline) it hits about 9.0:1. And works its way up to 10.5:1 (with more airflow) at near redline.


My opinion is, that carbjetkits is a company whose job it is to make money. In order to make money they have to sell. The only true way to know how to jet your bike is to run an AFR gauge on it. Or, to have someone else with the same or similar set-up run an AFR sensor, and tune. Then match their tuning. Read through that linked thread. I hope my contribution will be worthy.


I'm in process of tuning my stock bike. Unfortunately, I've been on a long sabbatical away from my bike due to my Mom being in the hospital, then passing away. Followed by my dad being sick this past week / weekend. Hopefully this evening, I'm going to start gathering data. The weather looks good. So maybe I'll get some runs in.




7milesout

2016 Honda Rebel 250 - The "Piglet."
Totally Stock at the moment.
Bought on 6/29/19 with 44 miles.
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