Honda Monkey Exhaust on CT70

Old Guy Too Many Bikes

Old Guy Too Many Bikes

Well-Known Member
A few months ago, my son bought a brand new Honda Monkey. Neat little bike. Well, being a fuel injected motor, the exhaust system goes from the head pipe, under the engine, through a catalytic converter, then makes a u-turn and comes up, makes another bend and then out to a cannister muffer out the back. Nasty thing, but the bike had a nice exhaust sound, more of a blub blub blub, rather than a rat tat tat. Well my boy bought an replacement exhaust that has no cat but looks almost stock. Sounds the same albiet maybe a bit louder. I took the old one of course. So today I spent the day cutting and welding until I came up with a something that resembles an exhaust system. And you know what, it goes blub blub blub. (My CT has a YX140 in it). I sprayed the exhaust with some black Hi-temp and will post a picture tomorrow. May not be the trickest system, but the price was right.
 
Old Guy Too Many Bikes

Old Guy Too Many Bikes

Well-Known Member
Old Guy Too Many Bikes said:
A few months ago, my son bought a brand new Honda Monkey. Neat little bike. Well, being a fuel injected motor, the exhaust system goes from the head pipe, under the engine, through a catalytic converter, then makes a u-turn and comes up, makes another bend and then out to a cannister muffer out the back. Nasty thing, but the bike had a nice exhaust sound, more of a blub blub blub, rather than a rat tat tat. Well my boy bought an replacement exhaust that has no cat but looks almost stock. Sounds the same albiet maybe a bit louder. I took the old one of course. So today I spent the day cutting and welding until I came up with a something that resembles an exhaust system. And you know what, it goes blub blub blub. (My CT has a YX140 in it). I sprayed the exhaust with some black Hi-temp and will post a picture tomorrow. May not be the trickest system, but the price was right.
Click to expand...

Here it is, installed on the bike. I left a bung on just in case I need to install some kind of heat shield.
 

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darrel gunderson

darrel gunderson

Active Member
I just bought a 2021 Monkey myself. I took the stock ugly heavy exhaust off and installed a TB system. Runs and sounds way better.
 

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Old Guy Too Many Bikes

Old Guy Too Many Bikes

Well-Known Member
darrel gunderson said:
I just bought a 2021 Monkey myself. I took the stock ugly heavy exhaust off and installed a TB system. Runs and sounds way better.
Click to expand...
I can't justify the price, but I really love riding that Monkey. My son's is blue also. His system has a similar sized but less restrictive muffler that eliminates the cat. It still uses the OE heat shields so it still looks stock. We went on a 70 mile canyon ride on Tues. I'm still breaking in my CT70, so I rode my Lifan 140 powered , skinny tired, CL90 and I couldn't keep up with him in the corners. It was a dead heat in a drag race from zero to 50 though. I hope to beat him once I get the YX140 installed.
 
Gary

Gary

Well-Known Member
The year 2071.... I'm looking for an original NOS exhaust system for my 2020 Monkey,just missed out on a used one for 250 bitcoins
 
Old Guy Too Many Bikes

Old Guy Too Many Bikes

Well-Known Member
My great grandfather had one way back when, but he cut it up for his CT70 Honda which was passed down to me. I still ride it since I had the hover conversion done to it a few years back.
 
D

Deoodles

Well-Known Member
Congrats Darrel. I put the Takegawa on mine and some other mods and ended up back at bone stock. I was lucky enough to get everything sold except the TB cam. I just like it stock for some reason. Blue is the best color IMO.
 
Old Guy Too Many Bikes

Old Guy Too Many Bikes

Well-Known Member
My Harley riding buddy has got the little bike itch and wants a Monkey. But here is So Cal, there's none to be found. Some dealers will take a deposit and put you on a list, but are charging $500 over list price. Even used ones are few and far between and asking $4500 and up. In the meantime, I'm breaking in my CT70 with the YX140 in it. Did the 30 min zinc oil change and valve adjustment. Doing an easy 100 mile break in. Passed 50 miles today and did my first full throttle pull in 1st and 2nd. Couldn't keep the front wheel on the ground in 1st unless I'm leaning way over the handlebars. (make that 2 full throttle pulls). I think this bike will show it's tail light to a stock Monkey.
 
Old Guy Too Many Bikes

Old Guy Too Many Bikes

Well-Known Member
Bike's running great except it was burbling at light loads and steady speed. Idles perfect, full throttle good. Heard good things about the Mikuni VM 26 and was considering getting one since my motor has the Volk Chiniese copy. Checked the plug, looked good, nice and tan. so I tried raising the needle one notch, figuring it needed more fuel and it ran worse. So then I lowered the needle to the top notch and the problem went away. I'll run it a while and check the plug again.
 
P

Paul7060

Member
Old Guy Too Many Bikes said:
Here it is, installed on the bike. I left a bung on just in case I need to install some kind of heat shield.
Click to expand...
I built this one stock is barely 1” ID . This is a reverse cone megaphone muffler . With removable muffler core using the stock heat shield . This a TBOLT 140 engine
 

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