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Fine Tuning Kz650
- KawiConvert
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I notice in your tag line it says:
"with pods "
The symptoms are:
"As they are now, I've got a decent bottom end, flat from about 2500 to 4500, alive from 4500 to 7500, and gutless from 7500 on."
This part sounds like the main jets are off:
"gutless from 7500 on."
This part:
"flat from about 2500 to 4500, alive from 4500 to 7500,"
Sounds like the needle taper is wrong or the needles are in the wrong place.
With pods, you can make engine tuning your life's work. The jet sizes and needle taper sre dialed in by the maker to match the flow characteristics across the RPM band. Changing to pods changes the flow characteristics.
That sounds reasonable with what is going on. I'll check the needles to see which ones they are for sure and also order some larger mains.
It is odd because at about 80mph at WOT I'm at about 6-7k RPMs and the bike then creaps the rest of the way to 86-90 and I run out of road before it can ever creep any higher. I am not as worried about top speed as I am about reaching it quickly for passing if needed. Tried to pass a pickup and they accelerated and kept pace till I topped out. Kinda sad that a 15 year old pickup can keep up with a bike, even a 30 year old one.
1978 KZ650 D1 ~ Carb jetting: 107.5 & 20 & 4th groove with pods and 4-1 Exhaust
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- Bluemeanie
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"flat from about 2500 to 4500, alive from 4500 to 7500" sounds like part of the problem I was having. See "Stock specs screwing me up" in carb section.
1980 KZ650F1, Bought new out the door for $2,162.98!
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- KawiConvert
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I found a decent condition, well priced, aftermarket 4-1 and muffler. Put it on, upped my mains to 112.5, pilots to 22.5 and left the needle alone. For the first time I broke 90mph on my bike. With more room and time I might have gone for the gold.
As it is now when I open the throttle wide while the engine is still building up I get a crackly sound from the engine. I seem to have decent power, but it may be too rich. I am not sure as I haven't had this behavior out of my engine before. It is usually when I have it WOT or almost there while still accelerating. I may need to practice good throttle control, but wondering if it may be something else.
Thanks for the help so far.
1978 KZ650 D1 ~ Carb jetting: 107.5 & 20 & 4th groove with pods and 4-1 Exhaust
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- anarki650
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09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
Omaha NE
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- KawiConvert
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Holy cow those are HUGE pilot jets!!! Are you SURE that you don't have a gummed up passage in one or more of the carbs? When running K&N pods and no baffle 4-1 I never had to go over a 17.5 pilot...
Thats what I was thinking as well, but that is what it takes. The carbs are clean, I've blown air through, soaked them and cleaned them, cleaner spray, checked all of the jets when they came off. Nothing blocking them or causing trouble. I may need to back the main jet off a step, but that is what I was trying to find out.
1978 KZ650 D1 ~ Carb jetting: 107.5 & 20 & 4th groove with pods and 4-1 Exhaust
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- anarki650
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09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
Omaha NE
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- KawiConvert
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After a good long ride today, I think I'm going to drop the mains a size, try it tomorrow, and possibly move the needle. Also going to turn the air screws in 1/2 turn as the idle is a little rough, but the power at the bottom is good.
1978 KZ650 D1 ~ Carb jetting: 107.5 & 20 & 4th groove with pods and 4-1 Exhaust
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- timebomb33
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1973 z1 2-1974z1-a,2-1975z1-b dragbikes1015cc+1393cc, 1977kz1000,1978kz1000,1981kz1000j, 1997 zx-11, 2000 z12r,1428turbo nitrous pro-mod and a shit load of parts thats all for now leader sask.,CANADA
I THINK MY POWERBAND BROKE
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