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Kz 440 MAC Exhaust Questions
- Tyler
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Anyway I found a 2 into-2 MAC exhaust for my 83 440 and was wondering if people have had to re-jet the carbs when running this exhaust kit? I have the factory air filter and air box installed.
If I knew what I was doing all the time life wouldn't be any fun.
'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro
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- bountyhunter
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Hello everyone. It has been a long winter but I finnaly got the bug yesterday ant took my 440 out for a spin. I don't think I have ever been on a bike before the first of April. Living in ND I can't complain although it was only 29º F.
Anyway I found a 2 into-2 MAC exhaust for my 83 440 and was wondering if people have had to re-jet the carbs when running this exhaust kit? I have the factory air filter and air box installed.
I put a 2-1 MAC on my 750 twin and I did have to rejet and change the needle positions. Mine runs OK with the stock main jet but I had to go about three sizes richer on the pilot jet and two slots richer on the needles.
1979 KZ-750 Twin
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- Tyler
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If I knew what I was doing all the time life wouldn't be any fun.
'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro
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- bountyhunter
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Ok so I will probably have to do some tuning. Is there a good place to find jets? Are they a statndard aftermarket type, or do I have find used and NOS OEM parts?
This place had the biggest selection and lowest prices on jets for mine:
www.psep.biz/
They were the only place I found that sold jets in pairs isntead of making you pay twice as much for a set of four.
All the other places don't seem to realize that not every bike on earth has four carburetors....
You should run it first, yours may run OK with the stock jets. If not, you can tune it up.
1979 KZ-750 Twin
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- Tyler
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I find that these smaller displacement Kaws can get realy finniky when you start changing intake and exhaust components.
If I knew what I was doing all the time life wouldn't be any fun.
'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro
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- Becker
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- The Doctor Will Rise Again
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78 KZ750B3
79 KZ400 LTD
78 KZ650C2
79 KZ650C3
78 KZ650B2A
80 KZ650F1
80 KZ650E1
81 CB750K Super Sport
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- Tyler
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If I knew what I was doing all the time life wouldn't be any fun.
'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro
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- bountyhunter
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I keep hearing about a removable baffle in this exhaust. IS there any effect other than noise to removing the exhaust baffel?
It will probably increase flow and make the engine run leaner. It will not necessarily improve performance.
1979 KZ-750 Twin
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- leboeuf
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- Tyler
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The bike runs great, I may not have to do anything to the carbs. I am gonna have to drive it for a while and see. I did suspect it was a littel on the rich side before I started, but it ran about the same with the new pipes on. The sound on the other hand is pretty cool. My 440 sounds pretty mean, I would think the biger bikes would sound much nicer though. :evil:
I had been watching these kits for a while, and I bought the last one Dennis Kirk had in stock because they knocked the price down $50. It's the only option you have if your cleaning up one of these old twins other than buying used stuff.
And thanks for the quick answers guys.
If I knew what I was doing all the time life wouldn't be any fun.
'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro
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