Can I use newer stock cams to boost my 78 kz1000?

Maybe I'm missing it so I'll ask anyways... :blush:

Why stock cams and not some performance cams .365 - .410?

What about the head, valve job, port & polished?

Upgrade the Carbs?

You running points or EI?

Home much "Boost" are you looking for/expecting is the real question... Pending what you're desiring to accomplish, some relatively cheap, others not so cheap...

example, just a little extra zip... EI and some different carbs and a 4-1 exhaust alone might make a difference your looking for.

Larry I thought those GPZ cams would require mods or special sprockets or something... maybe I'm confused. Would they bolt right in? Also I don't want the powerband to shift to a higher rpm range, would the GPZ cams do that? I like torque. Thanks much for all your expert advice.

Old Man Rock wrote:

Maybe I'm missing it so I'll ask anyways... :blush:

Why stock cams and not some performance cams .365 - .410?

What about the head, valve job, port & polished?

Upgrade the Carbs?

You running points or EI?

Home much "Boost" are you looking for/expecting is the real question... Pending what you're desiring to accomplish, some relatively cheap, others not so cheap...

example, just a little extra zip... EI and some different carbs and a 4-1 exhaust alone might make a difference your looking for.

Please read my first post. I have BS34s and a Vance Hines drag pipe, Dyna ignition, all else is stock.

well if youre after torque/throttle response id suggest a set of 28-29mm carbs .
what do you have for a baffle in that pipe?

Actually I noticed a significant boost in low rpm torque when I went from the stock carbs to the bigger BS34s. strange but true.

The pipe has a homemade baffle, I think it's about 2" in diameter I don't recall. It's straight thru. I've tried running wiht and without, I notice a slight diff at hi rpm, but nothing down low.

Okay okay so it's bad idea to fart around with the valve clearance - it's real easy to burn your exhaust valves if you're not careful.

For your bike, any intake cam from the Z1 to the 1978 KZ1000 will work fine. '79-'80 intake cams will work, just change the sprockets.

Sure guys, it's a small gain, but this guy is after cheap power. It's all labor. Intake cams are a dime a dozen. In fact, I think I have one. PM me and I'll just send it to you, just pay the shipping.

-Dave

the stock 78 carbs are 26mm,28-29mm carbs are a vast improvement over them.
the stock ports on a 73-80 head will not flow more air than 28s/29s can supply.
34s on the other hand are basically pushing air through a pipe thats roughly 34mm then trying to force it into a pipe thats closer to 27-28mm with no transition between the two,try running down the sidewalk blind folded with a bunch of people behind you doing the same thing.
now to make it interesting put a step about 5" tall in the same sidewalk and see how that works,first guy trips then it gets really ugly from there! :laugh:

this is the air fuel mixture from your 34s trying to jump into your itty bitty intake ports! :woohoo:
smell what im stepping in? :laugh:
In the words of ronald reagan:mr nelson,tear down that damn wall and build those poor fish a ramp already damn it! :woohoo:

hah! yes I did notice the ports were a lot smaller than the carbs. I matched them real nice an smooth-like... and regardless of port sizes, I did feel a very significant improvement in low rpm power over the stockers.

See Dave understands - cheap is the key word here. I enjoy making something from nothing. I'm NOT buying a bunch of expensive performance parts. I just can't justify the expense right now. Just freshening up the stock stuff is pricey enough.

The BS34s were essentially free because I sold the old carbs for the same price... see how I think now? :lol:

Cheap, ahhhhhhhhhhhhhhh.... :S

<$100, change your sprocket ratios for quicker off the line... +2 up on the rear, -1 on the CC equates to Loss ~ 15-20mph off the top end mph...

I get it now..... The old "Dollar & a Dream" scenario :laugh:

beefsquasher wrote:

Okay okay so it's bad idea to fart around with the valve clearance - it's real easy to burn your exhaust valves if you're not careful.

For your bike, any intake cam from the Z1 to the 1978 KZ1000 will work fine. '79-'80 intake cams will work, just change the sprockets.

Sure guys, it's a small gain, but this guy is after cheap power. It's all labor. Intake cams are a dime a dozen. In fact, I think I have one. PM me and I'll just send it to you, just pay the shipping.

-Dave