Board index Flathead Power-Technical Questions, Answers, and Suggestions K-Models K motor Stroker?

K motor Stroker?

Moderators: Curt!, Pa

Post Mon Apr 03, 2006 6:09 pm

Posts: 71
Location: Northern IL, USA
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

Post Mon Apr 03, 2006 7:44 pm
xlr

Posts: 149
Location: calif
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.

Post Mon Apr 03, 2006 8:19 pm
xlr

Posts: 149
Location: calif
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

Post Mon Apr 03, 2006 8:40 pm

Posts: 71
Location: Northern IL, USA
I was concerned about the pinion shafts. Will sportster pinion shafts work for a 52 k?

Post Mon Apr 03, 2006 8:58 pm
xlr

Posts: 149
Location: calif
yes

Post Mon Apr 03, 2006 8:58 pm
xlr

Posts: 149
Location: calif
yes

Post Tue Apr 04, 2006 5:55 am

Posts: 1050
Location: Greenbackville, Virginia, USA
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

Post Tue Apr 04, 2006 8:25 am

Posts: 55
Location: west coast
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.

Post Tue Apr 04, 2006 8:45 am
panic

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

Post Tue Apr 04, 2006 2:32 pm
xlr

Posts: 149
Location: calif
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.

Post Tue Apr 04, 2006 3:00 pm
panic

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

Post Tue Apr 04, 2006 3:21 pm
xlr

Posts: 149
Location: calif
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.

Post Tue Apr 04, 2006 3:39 pm
panic

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

Post Tue Apr 04, 2006 4:05 pm
xlr

Posts: 149
Location: calif
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

Post Wed Apr 05, 2006 7:46 am

Posts: 1675
Location: Interlaken, NY USA

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

Post Wed Apr 05, 2006 8:40 am
panic

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

Post Wed Apr 05, 2006 8:45 am
panic

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

Post Wed Apr 05, 2006 10:44 am
xlr

Posts: 149
Location: calif
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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