Honda Monkey Tune

Discussion in 'Modifications' started by Deoodles, Aug 12, 2020.

  1. Deoodles

    Deoodles Well-Known Member

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    Thanks. It does. I’m waiting on a new breather tube so I can go back to the stock air box. I know I’ll slow it down a bit but it surpassed my expectations so now I have the luxury of eliminating the Intake to quiet it down a bit and still be satisfied with performance.
     
  2. Deoodles

    Deoodles Well-Known Member

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    I installed the stock intake, I lost 3mph I way over did it with the mods so I started to go backwards. First was going back to the stock air box, next I went back to the stock exhaust. The bike still hits 60 easily. I’m still over geared And can’t hit the rev limiter in 3rd or 4th so I’m going to try 15/37. Right now it’s 14/34. The TB cam actually took away low rpm torque and 4th gear is still too tall. I think the cam, self tuning ecu and gears are really all that’s needed To have a 55mph road bike. It’s whisper quiet. I rode with oldct and kept up with his lifan 140.
     
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  3. kirrbby

    kirrbby Well-Known Member

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    What didn't you like about the exhaust, Ray? Little louder? Or you just decided it wasn't necessary?
     
  4. racerx

    racerx Administrator
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    That's rather surprising. I believe you, it's just a big difference...a little north of 1hp(!). Who'da thunk it?o_O
     
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  5. Deoodles

    Deoodles Well-Known Member

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    Hey Kirrbby. I did like the Takegawa SP exhaust. It added maybe 2 mph on the top but I didn’t need that. I wanted good get up and go and to be able to go 55mph sustained for a few miles. I can do that without the aftermarket exhaust. It had a lower tone and wasn’t much louder than stock it also gives the bike almost 3 inches of clearance; another thing I found I didn’t need. You said you took one for a ride I bet how quiet it was was one of the first impressions you got, I really enjoyed that, so going back to stock was an easy choice. I love how quiet it is and how it performs with the other mods. I did 25 miles sustained at 45 mph and checked temp. 185 deg. Not having to deal with heat management is a big plus so getting the performance I need and keeping it simple and close to stock is what is important to me. I’m going to play around with gears to optimize fourth gear. Once I find the right combo I think I’m set. So far I’m enjoying it.
     
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  6. Deoodles

    Deoodles Well-Known Member

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    I don’t think I will be posting much more on this tune. Fattcat was correct it would take a substantial build to have a 60mph tune. I’m not willing to go there. I have adjusted my goals accordingly and am happy with what I have. The TB cam, the self mapping ecu from cjr and the right gearing. It is counter intuitive to increase the rear sprocket size to go faster but that is what it needed. I went from 15/34 to 14/34 to 15/37. The last one hit 55mph in 3rd and 4th sustained it and pulled to 63. These are real road numbers and not I need flat roads or 2 miles to get there. These are there’s a car behind me and I need to go.. I can pull 4th from 40mph to 60mph pretty much anytime I need. I took it on my 75 mile loop and was able to sustain 55mph everywhere I needed to. Engine temp never went over 81 Celsius.:)
     
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  7. kirrbby

    kirrbby Well-Known Member

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    Well I'm well enough impressed Deoodles.
    If you're happy with it, it must be pretty darn good. I know you're used to riding a fast CT70. If you've made this Monkey comparable to that...I bet I'd love it too.
    I still say, it seemed to be too easy. To me, it makes the Monkey more appealing. More like it SHOULD have come right from Honda.
     
  8. Deoodles

    Deoodles Well-Known Member

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    Yup this is how it should have come but.... it wasn’t easy. All in for parts almost $800. To start. Fuel injection. Backing off the mods puts $400 worth of parts on the shelf. I’m trying to sell on the Grom forum to get some of that back. Fuel injection. Also. I lost gas mileage. I started at 150 mpg and I’m testing a tank now but I’m thinking it’s down around 110/120 mpg now. I won’t be changing a thing. Fuel injection. It doesn’t have the same wheelie torque As the CT70 but it makes up for that in comfort and style. Did I mention fuel injection??? :whistle:
     
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  9. Deoodles

    Deoodles Well-Known Member

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    Ride report update. I haven’t changed anything since my last post. The bike does well on the roads I run on and doesn’t require any further adjustments. A few points worth noting. The cam is louder than the stock cam. Also, with this cam the intake noise is a little bit more; even with the stock air box. Fuel economy is now in the gutter. It started out stock at 150mpg. Now it is only 100mpg. Where did they go??? Top speed is 62mph in 4th and oil temps stay in the 80’s C. The bike is very peppy.
     
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  10. Deoodles

    Deoodles Well-Known Member

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    Never done. I didn’t like losing the gas mileage and I didn’t like the cam noise. I ended up back at stock. I have 1000 miles on it now and top speed is 63mph. Back to stock and gas mileage is upwards of 130 mpg. It was higher during break in because I was riding very conservative. I can pull 56 on inclines and that’s good enough. Really enjoy the ride. For anyone thinking about performance mods the best was putting a 14t front sprocket. All others took away from the quiet ride. I spent 800 bucks on bolt on mods that are now sitting in my parts bins. Maybe another day but not today
     
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