Rebel AFR! - Page 4 - Honda Rebel Forum
 10Likes
Reply
 
Thread Tools Display Modes
post #31 of 96 Old 09-17-2019, 08:18 AM Thread Starter
 
7milesout's Avatar
 
Join Date: Jun 2019
Posts: 175
Garage
Quote:
Originally Posted by VAReb View Post
Using your data on 45-50 mph being the most efficient travel speeds, I am confident I could get much higher mpg out beyond this urban environment.
VAReb - Even though somewhere in the 40 - 50 mph range should be the most fuel efficient, I recommend to all riders to sit back and enjoy the ride no matter the speed. Whatever speed is safest and suitable for the conditions, which should lead to the maximum enjoyable ride.


Because either in the optimal fuel economy range or not, the Rebel is very fuel efficient. I bought a Burgman 650 Executive, and gave up on it quickly because it was such a fuel hog. 47 mpg is the best I could do on it. I can almost do that with my Corolla. I think the CVT and the final drive are not very efficient. Sucker runs good and will do 100 mph, but, it is not nearly as enjoyable as the Rebel. I've rode all types. In the future I may find the biggest hulking Goldwing I can find, but for now, I'll ride around on the Rebel and love it.
markwilliamson likes this.

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.
7milesout is offline  
Sponsored Links
Advertisement
 
post #32 of 96 Old 09-17-2019, 08:46 AM Thread Starter
 
7milesout's Avatar
 
Join Date: Jun 2019
Posts: 175
Garage
flitecontrol - I have to say, I've never been a big believer in reading a spark plug. My gut always told me they don't change in color quick enough to be clear enough on what's truly going on with a combustion event. Which is what led me to buying the wideband AFR for my Scamp. I had to replace the whole exhaust on that LA 360 anyway. So when I did, I bought headers, 2.5 inch pipes, ran that through a X-Pipe and Borla mufflers. I had a bung mounted on each exhaust bank. Boy, what an eye opener for me. I had been having the most difficult time cranking the Scamp prior to the new exhaust and gauge because I kept flooding it.


However, upon installing the AFR gauge, I found out quickly, that I was having a hard time starting the Scamp because … I wasn't giving it nearly enough gas! I wasn't flooding it at all! I learned that if there's one thing an LA V8 just loves, and that is GAS. I swear, it seems like I could fill the cylinders with gas and the sucker would fire right up. If it weren't for the AFR gauge, there's no telling just how --itty the car would crank and drive. And how poorly it would be carbureted. I would probably be in a constant state of aggravation with that car. An AFR gauge is a gift from God. Now the Scamp fires right up, and all except for one lean stumble off-idle, (which is a downleg booster Edelbrock trait), the car feels like it is fuel injected, and will melt the tires. That's why when I got the Rebel, I just knew I would have to put the AFR gauge on it. I had a local trustworthy shop do an alignment on the Scamp. And the tech came back and said, "there's one thing about it … that Scamp sure runs good." Had a Scamp load of friends ride with me to lunch one day and wanted to feel the power. One of them commented, "I didn't think it was going to pull like that." And the rest were all in agreement. I have learned a lot about Edelbrock carbs and tuning with an AFR gauge! Anywho…


If you were going 55 - 60 mph uphill, it stands to reason that main jet was largely involved in that. One thing I can note is that once the main jet is involved, the AFR tends to drop very linearly from the point the main jet first gets involved until the throttle is pinned. With a pinned throttle at 55 to 60 mph on the stock main (and all other stock stuff like filter and airbox), the AFRs will hit the 9 to 9.5 level (as shown on my plot). But if you weren't pinned it could have easily been 12.5 or higher … even to slightly above 14.7. There are lots of throttle inputs on the Rebel that run the AFR to a perfect condition. But what's a perfect condition? Depends on who you ask. The engine, the environment, me, you, will all have differing opinions. I like the fact that there are conditions the Rebel goes extremely lean. As long as it runs good. And I like the fact that the stock carb has the ability to completely satisfy both cylinders at max rpm and WOT. I was not expecting it, but the carburetion on the Rebel is able to quickly swing from super lean, to super rich. It can cover a lot of AFR ground.


As for why yours were so white? Dunno, never a big believer in that. Maybe your ride prior to your chop got the spark plugs really white and then your chop pull didn't change their color that quick (just speculation). I have not a clue. But one thing I can tell you, this AFR gauge doesn't lie. Will my tuning make much difference? Meh … maybe not. We've only 234 cc to work with. But any improvement in 65+ mph performance I'll take, especially if it will use a skosh less fuel in doing so.




7mileout

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.
7milesout is offline  
post #33 of 96 Old 09-17-2019, 08:53 AM
Moderator
 
Join Date: Aug 2008
Location: Monroe, Louisiana
Posts: 28,212
Forgot to mention that I also converted to a first generation air filter setup, if that amounts to a hill of beans.

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
flitecontrol is offline  
 
post #34 of 96 Old 09-17-2019, 08:59 AM Thread Starter
 
7milesout's Avatar
 
Join Date: Jun 2019
Posts: 175
Garage
I have to go to my dad's house this weekend. Which is about 125 miles on interstates … through Atlanta and about another 15 miles surface streets. I was thinking, that once north of Atlanta, maybe I start at some even 10 mile marker and hold that sucker wide open for as long as I can, and record the time and miles it was wide open. That would give me an average WOT speed. Then, after tuning, I do that again some time and note the difference.


Sounds difficult to achieve. But I may give it a try if I'm dumb enough to ride up there on the Rebel. I say dumb because I would head out right after work (5 pm-ish). Luckily, the traffic is mostly going the other direction, and now I can hit the Northwest Corridor toll road and get through Atlanta reasonably quick. Just a lot of cars to deal with, many of which are trying to do 90 mph.

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.
7milesout is offline  
post #35 of 96 Old 09-17-2019, 09:00 AM Thread Starter
 
7milesout's Avatar
 
Join Date: Jun 2019
Posts: 175
Garage
Quote:
Originally Posted by flitecontrol View Post
Forgot to mention that I also converted to a first generation air filter setup, if that amounts to a hill of beans.
It could. Does it seem like to you that the construction of that air filter setup is more, or less restrictive?

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.
7milesout is offline  
post #36 of 96 Old 09-17-2019, 01:30 PM
Moderator
 
Join Date: Aug 2008
Location: Monroe, Louisiana
Posts: 28,212
I really didn't notice any difference between the two filters. But then my butt dyno isn't as sensitive as others.

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
flitecontrol is offline  
post #37 of 96 Old 09-18-2019, 08:45 AM Thread Starter
 
7milesout's Avatar
 
Join Date: Jun 2019
Posts: 175
Garage
My new main jets are between Jacksonville, FL and Atlanta! I'm getting excited. I may go ahead and start messing with the carb, to see if I can shortcut this process.


Flitecontrol - you mentioned (I think it was) some hex head screws or something similar on the bottom of the float bowl. Do these carbs come with those crappy soft phillip's pan head screws on the float bowl that try to strip out in the screw drive area? Those are the worst. If so, can you identify the replacements (if that's what you were getting at)? I'll start trying to source them.


Thanks.

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.
7milesout is offline  
post #38 of 96 Old 09-18-2019, 09:11 AM
Moderator
 
Join Date: Aug 2008
Location: Monroe, Louisiana
Posts: 28,212
The OEM carb screws are indeed the "crappy soft phillip's pan head screws on the float bowl that try to strip out in the screw drive area" type. I replace all of them (11 IIRC) with stainless socket head type screws from a local company, Construction Bolts. If you can't find a source, I can send a set for $1.50 plus shipping. The USPS charges extra for any package they can't run through their automated equipment, and that includes anything metal.

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
flitecontrol is offline  
post #39 of 96 Old 09-18-2019, 01:47 PM Thread Starter
 
7milesout's Avatar
 
Join Date: Jun 2019
Posts: 175
Garage
Let me see how much I dislike them first. I'll let you know.

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.
7milesout is offline  
post #40 of 96 Old 09-19-2019, 08:13 AM Thread Starter
 
7milesout's Avatar
 
Join Date: Jun 2019
Posts: 175
Garage
Last night I got my wiring issue fixed. My AFR gauge was only powered while on LOW beam (white wire). Flipping to HIGH beam the AFR gauge would lose power. I connected to a blue and white wire. Now it stays on LOW and HIGH beam. I always run my HIGH beam during daylight hours. So far, everything looks good for a 125 mile ride up the interstate Friday evening.


The new main jets seem to be stuck in Macon, GA. Not an issue, I wasn't going to fool with them until next week anyway.




7milesout

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.
7milesout is offline  
Reply

Tags
air/fuel results, air/fuel tests, fuel economy

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda Rebel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome