There is No Fuel/Air Mix Screw on my Bike? - Honda Rebel Forum
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post #1 of 37 Old 05-18-2017, 10:13 PM Thread Starter
 
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Unhappy There is No Fuel/Air Mix Screw on my Bike?

Hello,

My post comes from desperation. I bought a 2013 Honda Rebel, it was a floor model in a dealership. It's my first bike, and I've driven it for about a year now. I love my bike... however...

1st Gear has a max speed of about 10mph (and sound horrible after 5-7mph), 2nd Gear about 20mph, and so on, with a max speed of about 50. My choke needs to stay on for a lot longer than my friend's bike (also a Honda Rebel). My research tells me to adjust the fuel/air mixture... and that's where I keep hitting a roadblock.

This is what I've found online.


And this is my friend's bike (and what I believe to be the mixture screw circled in yellow - although from the other side of the bike).


And here is my bike... (and I circled where I believe the mixture adjustment should be - same side as my friend's)

There is nothing to adjust. It is solid. No tab to turn. Nothing to move. I've even tried turning the whole thing with pliers (albeit gently). Nothing.

I bought a Fuel Mixture Screw thinking that is what I needed, and all I would have to do is screw it into the bottom. But the underneath of what I circled seems solid. I've poked around in there, and there is no opening. Here is a picture of the underneath of the yellow circle (it was the best photo I could manage).


So now I am at a complete loss. Anyone have any ideas of what I need to do? I feel like I'm missing something important here, I just cannot figure out what.

Any help would be greatly appreciated!

Thanks,
Nick
Attached Images
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File Type: jpg RebelIDLEmixSCREWS.jpg (63.8 KB, 18 views)
File Type: jpg NotMyBike.jpg (184.4 KB, 20 views)
File Type: jpg Screenshot_20170518-200629.jpg (127.5 KB, 16 views)
File Type: jpg IsMyBike.jpg (192.7 KB, 17 views)
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post #2 of 37 Old 05-18-2017, 11:12 PM
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Welcome to the forum.

Adjusting the air mixture along with the idle may help the bike idle better and minimize the need for choke, but it does nothing for all those other things you quoted.

I've never seen an air mixture screw or cover that looks like that. Mine looked like your friends before I cut the tab off of it so I could adjust it.

Maybe it is a California model or EPA adjustment preventer, or maybe someone put an aftermarket carb on it. Did you buy it new? Does it have any modifications to the intake, or exhaust, or sprockets?

Hopefully someone will chime in who has seen this, or knows what it is, or how to adjust it, or remove it.

Your max speeds are way off for a normal stock rebel. You should be able to hit the marks on the speedometer, 20 in 1st gear, 40 in 2nd, 55 in 3rd, 70 in 4th, and 80 in 5th, and maybe 85 on a good long straight. Mine does that regularly when I blow the carbon out of it.

Can you describe this horrible sound that you mentioned?

It probably just needs the carb cleaned, but I don't know about the sound.

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post #3 of 37 Old 05-19-2017, 12:18 AM
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I thought he was referring to engine noise. When you wind the engine out, it does sound like it's going to explode (it won't).

Guba is right!

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!

2001 & 2009 Rebel 250, 2006 Ninja 250, 1989 Vulcan 750
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post #4 of 37 Old 05-19-2017, 06:38 AM Thread Starter
 
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The sound is from the engine, as if it is straining to reach that speed. Similar to what (I imagine) it would sound like trying to reach 30mph in 1st gear on a (normal) rebel.

It was new(ish?). Floor model. Less than 100 miles on it (I cannot remember the exact number). Purchased in Wisconsin (I live in Chicago).

I have made no modifications to the bike other than a battery powered clock and a helmet lock (both on the handlebars).

I have no idea how to check for modifications to the intake, exhaust, or sprockets, but I have made none.

Shortly after getting it, I took it to a scooter shop (it was 2 blocks from my home), and someone suggested my problems were just because it was new, and it needed to be broken in. It now has more than 2000 miles on it.

Also, for what it is worth, at low speeds in first gear, it feels like a (heavily sedated) bucking bronco (not smooth).

I can take more pictures if that would help. Just tell me of what.
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post #5 of 37 Old 05-19-2017, 09:49 AM
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What you describe sounds pretty normal to me. If you get a chance, see if you can ride someone else's Rebel or have someone who's owned one ride yours and see what they think. The bucking part may be due to how you are shifting it.

Guba is right!

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!

2001 & 2009 Rebel 250, 2006 Ninja 250, 1989 Vulcan 750
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post #6 of 37 Old 05-19-2017, 12:04 PM Thread Starter
 
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There is no shifting involved when you are simply in first gear. My bike is unsteady at low speeds in first gear.

I have driven my friend's Honda Rebel. He has driven my Honda Rebel. We are in agreement - there is something wrong with my bike. The choke needs to be on for a LOT longer, the bike speeds are not what they should be, first gear is a lot less stable (I had to use his Rebel to pass the motorcycle test for my license).

For what it is worth, if the choke is about halfway open, it seems to run a lot more like I would expect it to run. I can't say if doing that corrects all my problems (since it is not something I make a habit of doing), but the few times I've done it on accident, I realized it because of thoughts like, "Wow, my bike's acceleration is great!" or "What on Earth is going on... I'm going 25mph in 2nd gear...."
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post #7 of 37 Old 05-19-2017, 01:09 PM
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I was primarily referring to how smoothly you let the clutch out when in first. If not done smoothly, it can cause the bike to "buck" for lack of a better description. Ditto for the transition from first to second gear.

From what you are saying, the need to use some choke definitely sounds like a carb issue. It's quite possible that sitting in the showroom for that long with gas in the carb caused it to gum up slightly.

As to the noise issue, it would be hard to diagnose from a distance. Have you checked to be sure the exhaust support bolts are tight?

Guba is right!

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!

2001 & 2009 Rebel 250, 2006 Ninja 250, 1989 Vulcan 750
Putting your bike year and model in your signature helps others help you!
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post #8 of 37 Old 05-19-2017, 02:25 PM
 
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Take it for a ride and be real easy on the throttle. See if you can get it to do better with it only a quarter or less of the way open, then try it full throttle. If there is a difference, you need to clean your secondary jet. Mine did this for a while. Ethanol is evil.

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post #9 of 37 Old 05-19-2017, 02:28 PM Thread Starter
 
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There isn't really a noise issue. Whenever you try too fast for the gear you are in, the engine will sound strained. That is all I was referring to. So, long story short, I usually switch to 2nd gear around 5mph (although I generally start in 2nd gear because what's the point of 5mph), I switch to 3rd gear around 25mph, and so on.

So, in the interest of clarity, let me retract my earlier comment about it sounding "horrible", and just say that I can hear the engine get significantly louder without going much faster after about 6mph while in first gear.

Also, even after I smoothly release the clutch, 1st gear is ALWAYS bucking at low speeds. I do not have that issue with my friend's Honda Rebel. My friend does not have that issue with his Honda Rebel. My friend DOES have that issue with MY Honda Rebel. So I don't think it's me, it seems like the bike.

The fact that I cannot find/adjust the fuel/air mixture makes me think that is, at the very least, part of the problem.
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post #10 of 37 Old 05-19-2017, 02:31 PM
 
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Mine bucked at WOT, but did fantastic at low speeds. Give my suggestion a try and let us know what happens.

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