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Rank: MSF graduate
Groups: Member
Joined: 8/3/2008
Posts: 29
Location: Milwaukee
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Anyone have these? It would be appreciated thanks.
1990 ZR550
1997 TL1000S
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Rank: Administrator
Groups: Administration
Joined: 4/23/2008
Posts: 222
Location: Catskill Mtns.
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The ZR550 cams are identical to each other with different timing (of course), but use the same gears, with the bolt locations changing between intake And exhaust. The ZR550 cams are identical to the early GPz550 cams (models that begin with KZ). The late GPz cams (models starting with ZX) have different timing and duration, use two different timing gears, and require use of the late GPz pistons to prevent bending valves. The late GPz pistons can be used with either set of cams, and the two types of pistons have the same compression ratio. Hope that helps.
| 1990 Kawasaki Zephyr 615 (Daphne) -=- 1986 Kawa Ninja 250 (stolen) | | The Motorcycle Fuel Injection Handbook -=- http://tinyurl.com/297abo |
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Rank: MSF graduate
Groups: Member
Joined: 8/3/2008
Posts: 29
Location: Milwaukee
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I was looking to see if they had some more duration and I was going to toss a set in while I'm doing my valves. Looks like that wont be the case lol. Thanks for the responce!
1990 ZR550
1997 TL1000S
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Rank: Administrator
Groups: Administration
Joined: 4/23/2008
Posts: 222
Location: Catskill Mtns.
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The late GPz cams have 10 deg. more duration each, and they are timed so that there is about the same overlap, IIRC. But like I said, you need the other pistons or you end up with bent valves. With stock carbs, pod filters, and a good aftermarket exhaust, you lose more off the bottom than you gain on the top with the late GPz cams, I do believe. Granted I had the big bore kit, but that ought to favor bigger cams with the same ports.
| 1990 Kawasaki Zephyr 615 (Daphne) -=- 1986 Kawa Ninja 250 (stolen) | | The Motorcycle Fuel Injection Handbook -=- http://tinyurl.com/297abo |
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Rank: MSF graduate
Groups: Member
Joined: 8/3/2008
Posts: 29
Location: Milwaukee
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I will be running pods and a Kerker with the stock carbs. I'm not planning on getting inside the engine so I'll leave cams alone. I was just going to toss a set in since it would be easy while setting the valves. I'm still needing some carb jets, recommendations on what kind and where to purchase?
1990 ZR550
1997 TL1000S
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Rank: MSF graduate
Groups: Member
Joined: 6/7/2008
Posts: 45
Location: Delaware Ohio
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Your Father wrote:I will be running pods and a Kerker with the stock carbs. I'm not planning on getting inside the engine so I'll leave cams alone. I was just going to toss a set in since it would be easy while setting the valves. I'm still needing some carb jets, recommendations on what kind and where to purchase? Since the bike will definitely go lean you might consider the Dial-A-Jet enrichener system. The company owner will help you with the recommended set up. I've used them back in the 80s on a Nighthawk S to take care of a header and the mid range flat spot on a customer's bike, on my own stock Nighthawk, and have run it on my KLX650 covering for the addition of a big bore piston, reverse cone megaphone exhaust, and altitude/temp changes ranging from sea level to about 4000 feet and 20-95 degrees without any adjustment in it. I would bet you could ask for and get a money back guarantee if you asked. The owner and I communicated on the DAJ, why it is so ignored in motorcycles yet accepted readily by ATV and snowmobile markets. I think it's the newness of the two versus the old "jet 'em" attitude in motorcycles. He said he's never had a negative comment from anyone who's used the DAJ, only those who haven't. I've got several guys on the KLX650 group at Yahoo who've done the kit along with a close friend who put the exact same kit that my 650 used on his XT225. It works on the vacuum draw that occurs under lean conditions, so when the engine is drawing a good mix the DAJ basically has no effect - can't really run too rich - but feeds a gas/air mix under the lean draw, much like the Mikuni Powerjet feeds gas only. Yes, even Mikuni uses a similar method to richen mix. You could actually fit the kit without even taking off the carbs, by using the drain screw replacement nipples to feed the jet body. Seriously, take a look. Read the tests done when the DAJ came out by both Motorcyclist and Dirt Bike. Like I said, I'll do this in a heart beat over regular hard jetting. It's a bit costly, but it will pay back in not having to remove carbs/jet/replace carbs and repeat. I'm considering it for my stock Zeph, but funds aren't there right now for the kit of 4.
Mark - klx678 Delaware Ohio 1990 Kawasaki Zephyr 550 mostly stock - if I wanted faster I'd have bought faster 1995 Kawasaki KLX650 with a big bore Vulcan piston 678cc, a pipe, and Dial-A-Jet 1978 Yamaha SR500 eventually to be a 60's style flattrack look street tracker 1967or so Bultaco M27 Sherpa T - first bike I bought, 1971.
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Rank: MSF graduate
Groups: Member
Joined: 8/3/2008
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Location: Milwaukee
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Eh, I dunno about the Dial a jet. It's a neat concept but I'm getting mixed reviews from what I've read. I'm thinking I'll just get a jet kit. I've got nothing but time on this project and enough money into it. I think I can deal with pulling carbs and replacing jets.
1990 ZR550
1997 TL1000S
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Rank: MSF graduate
Groups: Member
Joined: 4/26/2008
Posts: 25
Location: San Francisco, CA.
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Hello all. There is a lot of camshaft information on the GPz550 site, and we're looking for information. http://www.nwsca.com/scripts/gpz_forum_2005/topic.asp?whichpage=2&TOPIC_ID=5887蒌 Were getting close to the difference in camshafts for the 550 models, and could use some help with the ZR550. We need the Cam Lobe Height. Looking at www.Kawasaki.com is states that the camshafts on the ZR550 is the same ones use on other models, but when actually measuring the lobe height, it's not the same. Anyways, if anyone here has access to a ZR550 Cam, and can measure the base circle, and the cam lobe height, we'd all be grateful, and we could put this wonderment to rest. The manuals are not always correct. If you have a ZR550 Manual(Kawasaki) and it lists the lobe height(getting tired of typing those words!), please list it here, and if you have the actual measurments, list them here as well. Sorry to thread pirate. How's everyone doing? Oh for those that know me, I'm now legal to Race my 1985 GPz550 in AFM here in Northern California. Bike is fast, but the rider needs to be faster. I have a bunch of on-bike videos on YouTube under CoreyDSFA for those that are having the white stuff fall from the sky. Watch and lean with me would you? http://www.youtube.com/watch?v=LC4QdO9wmZwCorey Clough GPz550.com Admin
GPz550 Race Bike Stuff: http://smg.photobucket.com/albums/v97/CoreyClough/Track%20Bike%202009/GPz550 Pictures of Stuff I've Done: http://smg.photobucket.com/albums/v97/CoreyClough/Coreys%20GPz550%20Pics/YouTube Videos: http://www.youtube.com/user/CoreyDSFACorey San Francisco, CA (The Straight Part) AFM #944
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Rank: Administrator
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Corey, the early GPz550 and the ZR550 have the same exact part number for their cams. Any differences on a particular set of cams would be down to modification, as I don't think manufacturing variances would be more than a few tenths of a mm at the very worst.
| 1990 Kawasaki Zephyr 615 (Daphne) -=- 1986 Kawa Ninja 250 (stolen) | | The Motorcycle Fuel Injection Handbook -=- http://tinyurl.com/297abo |
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Rank: MSF graduate
Groups: Member
Joined: 4/26/2008
Posts: 25
Location: San Francisco, CA.
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Rank: Administrator
Groups: Administration
Joined: 4/23/2008
Posts: 222
Location: Catskill Mtns.
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Bah, I forget my login name there, so I can't see the thread. :(
| 1990 Kawasaki Zephyr 615 (Daphne) -=- 1986 Kawa Ninja 250 (stolen) | | The Motorcycle Fuel Injection Handbook -=- http://tinyurl.com/297abo |
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