1954 KHK

Production K Models

Re: 1954 KHK

Postby Mutt » Tue Jun 19, 2018 8:41 am

The info says KHK light lifters. So did the regular K models use lifters with a solid body and the KHK use 45 lifters with 2 holes?
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Re: 1954 KHK

Postby wz507 » Tue Jun 19, 2018 9:27 am

3 hole tappet

3-hole tappet.jpg
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Re: 1954 KHK

Postby Mutt » Tue Jun 19, 2018 9:33 am

Thanks for the pic
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Re: 1954 KHK

Postby starcain » Tue Jun 19, 2018 11:19 am

Comparison pics of K tappets and tappet screws.
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K Tappet Compare (Copy).jpg
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K Tappet Screw Compare (Copy).jpg
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Re: 1954 KHK

Postby Mutt » Tue Jun 19, 2018 1:19 pm

awesome. Does anyone reproduce these light lifters and adjusters?
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Re: 1954 KHK

Postby wz507 » Tue Jun 19, 2018 2:11 pm

Both Jim’s and S&S make tappets with drilled bodies, but don't know of any hollow adjusters. The weight of the parts made by Jim’s is 74 g, and I don’t know what the weight of the S&S part is. If the S&S part and Jim’s part have the same body thickness, the S&S part having the larger holes should be lighter. Recently ordered some S&S tappets so will post when I weigh them. Don't know that 5-10 g difference in valve train weight is so critical on our machines since a flathead valve train has a fairly easy life without the extra mass of a rocker arm and pushrod to return, and the low spring force that is not magnified through a rocker arm.

Jims tappets.png
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S&S flathead tappets.jpg
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Re: 1954 KHK

Postby Mutt » Tue Jun 19, 2018 5:24 pm

What's the price for the S&S? Do they come in oversize?. I don't care much for Jim's stuff. Seen too many broken pinion shafts that were made by Jim's
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Re: 1954 KHK

Postby wz507 » Tue Jun 19, 2018 6:11 pm

The S&S lifters can be ordered in std and +0.005" OS. I think they retail for ~ $350 but you can find them for less, as shown at the link below. I think you can also purchase just the bodies with no adjuster, which can account for a significant savings. Another nice feature of the S&S product is that there is a wrench flat on top of the body so you can secure the body, and not torque it when making a lifter adjustment.

http://www.powersportparts.net/i-259537 ... gIN9fD_BwE
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Re: 1954 KHK

Postby wz507 » Fri Jan 25, 2019 3:26 pm

wz507 wrote:Recently ordered some S&S tappets so will post when I weigh them. Don't know that 5-10 g difference in valve train weight is so critical on our machines since a flathead valve train has a fairly easy life without the extra mass of a rocker arm and pushrod to return, and the low spring force that is not magnified through a rocker arm.

To follow-up on this, an order for S&S tappets resulted in disappointment since this tappet is no longer offered. Opted for Sifton Lightning tappets in 0.005" OS which weighed 83.3 g/tappet, so on the heavier end of the spectrum and about the same as K and KH tappets (see Starcain's weights given above). In appearance these are conventional looking K, KH, tappets with 2 large dia holes through the body of each.
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Re: 1954 KHK

Postby gabbyjon » Mon May 20, 2019 5:03 pm

I have a serial # 54KH1751
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