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K motor Stroker?

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Dave56KHK

Posts: 71

Joined: Sat Feb 05, 2005 1:01 am

Location: Northern IL, USA

Post Mon Apr 03, 2006 6:09 pm

K motor Stroker?

A friend of mine bought a 52 K rolling basket. It came with KH barrels but still has the stock flywheels. He wants to stroke it to a KH. Can this be accomplished? I told him the best thing would be to buy a set of K barrels and be done with it, but he really wants to stroke it. Thanks
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xlr

Posts: 149

Joined: Thu Aug 05, 2004 12:01 am

Location: calif

Post Mon Apr 03, 2006 7:44 pm

no problem. get set of kh flywheels 4 9/16. s/s makes 4 5/8 for sporsters. u can make head gasket or trim top of piston have done by triming piston. have to clear cases and make sure pistons dont hit flywheels. maby u can use 45 low compression pistons not sure of deck hight of that piston. but can be done with out much work. one important thing to check is breather timing after u do most time with strokers breather timing has to be redone. little work buy well worth it. lot power to be gained.
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xlr

Posts: 149

Joined: Thu Aug 05, 2004 12:01 am

Location: calif

Post Mon Apr 03, 2006 8:19 pm

hi again here is another way i have done couple times this is probley best way. if u have skilled machinest u can remachine head in cobustion area i have machined as much as .150 from that area
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Dave56KHK

Posts: 71

Joined: Sat Feb 05, 2005 1:01 am

Location: Northern IL, USA

Post Mon Apr 03, 2006 8:40 pm

I was concerned about the pinion shafts. Will sportster pinion shafts work for a 52 k?
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xlr

Posts: 149

Joined: Thu Aug 05, 2004 12:01 am

Location: calif

Post Mon Apr 03, 2006 8:58 pm

yes
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xlr

Posts: 149

Joined: Thu Aug 05, 2004 12:01 am

Location: calif

Post Mon Apr 03, 2006 8:58 pm

yes
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greybeard52

User avatar

Posts: 1050

Joined: Tue Dec 05, 2000 1:01 am

Location: Greenbackville, Virginia, USA

Post Tue Apr 04, 2006 5:55 am

Like XLR said, yes, BUT you'll have to use a sporty engine sprocket. Not a bad thing if you stroke it. It'll give you longer gearing and a sporty primary chain. Also if i remember right the KH clutch and trans gears are much heavier.
Ah what the heck, tell your friend to sell me the barrels. :wink: :wink: G
The reason people blame things on previous generations is that there's only one other choice
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ramjet

Posts: 55

Joined: Mon Apr 03, 2006 9:07 am

Location: west coast

Post Tue Apr 04, 2006 8:25 am

K motor Stroker

You guys ever heard of using short rods, and short barrels ? Quick revs with this set up. I saw a set of these barrels on e-bay a couple of months ago.
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panic

Post Tue Apr 04, 2006 8:45 am

Last edited by panic on Thu Jun 15, 2006 10:28 am, edited 1 time in total.
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xlr

Posts: 149

Joined: Thu Aug 05, 2004 12:01 am

Location: calif

Post Tue Apr 04, 2006 2:32 pm

hi some years ago tom sifton and jerry branch and lenord andres made short rods they did it by cutting rods and welding i did 2 sets for tom. better rod angle but hard on pistons. xr 750 rods r shorter so r xr 1000 barells is where most of the work. yes i seen the barrells in person that was on ebay. i have 3 sets i got from andres. set up for dual carb.
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panic

Post Tue Apr 04, 2006 3:00 pm

Last edited by panic on Thu Jun 15, 2006 10:27 am, edited 1 time in total.
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xlr

Posts: 149

Joined: Thu Aug 05, 2004 12:01 am

Location: calif

Post Tue Apr 04, 2006 3:21 pm

panic hi may i ask why cant u use 45 pistons? quality? what i mean is ones that r availble from v twins they have low comm. and high as u know. have held and mesured both deck hight diffrent. if fellow has k stroke is 3 13/16 to 4 5/8 yes kh 4 9/16. want to loss wieght in clutch cut outter and inner to make 5 plate out of it. infact harley use to sell 5 plate conversion for r models. now we use alum ones i make them for xr 750s. that s why i said 45 pistons they look same as k low comperssion ones. when i install oil pump i always degree it rather than marks. most my experance is with r models wr kr xlr xr 750. but in last few years been converting ks to krs lot of them out there now.
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panic

Post Tue Apr 04, 2006 3:39 pm

Last edited by panic on Thu Jun 15, 2006 10:27 am, edited 1 time in total.
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xlr

Posts: 149

Joined: Thu Aug 05, 2004 12:01 am

Location: calif

Post Tue Apr 04, 2006 4:05 pm

ok i see if i am right what u r saying the top ring from wrist pin hole is diffrent on k kh and 45
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Frankenstein

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Joined: Thu Jun 27, 2002 12:01 am

Location: Interlaken, NY USA

Post Wed Apr 05, 2006 7:46 am

The shortened ones on ebay awhile back looked as if the base flange was turned down, a new flange machined and fitted higher up on the cylinder. Then of course, they must have cut down the spigot accordingly.
Dr.Dick
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panic

Post Wed Apr 05, 2006 8:40 am

Last edited by panic on Thu Jun 15, 2006 10:26 am, edited 1 time in total.
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panic

Post Wed Apr 05, 2006 8:45 am

Last edited by panic on Thu Jun 15, 2006 10:27 am, edited 1 time in total.
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xlr

Posts: 149

Joined: Thu Aug 05, 2004 12:01 am

Location: calif

Post Wed Apr 05, 2006 10:44 am

all short rod motors i have seen and had. had spigots welded one. i do have one set where they made a maifold lot of work. i did build one set once where carbs came out right side. thats best way but lot of work.

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