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Kx85 With Kx100 Sleeve?

This is a discussion on Kx85 With Kx100 Sleeve? within the 2 Stroke Pitbikes forums, part of the General Talk category; Hello guys i have a Kx85 and i was wondering wether the sleeve of the kx 100 in bolt on on my culinder or i ...

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    Hello guys i have a Kx85 and i was wondering wether the sleeve of the kx 100 in bolt on on my culinder or i have to do porting?


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    Quote Originally Posted by powerman View Post
    Hello guys i have a Kx85 and i was wondering wether the sleeve of the kx 100 in bolt on on my culinder or i have to do porting?


    A KX100 is just a bored out 85 cylinder from the factory. So you can get the cylinder you have bored and chromed. I believe Eric Gorr can get it done properly, and at a good price. High Tech Horsepower is supposed to be good as well. --L*64

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    another option just try and find a 100 top end maybe hit up ebay for a part out?

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    Quote Originally Posted by Luckystar64 View Post
    A KX100 is just a bored out 85 cylinder from the factory. So you can get the cylinder you have bored and chromed. I believe Eric Gorr can get it done properly, and at a good price. High Tech Horsepower is supposed to be good as well. --L*64


    Here in Greece i dont have the option of culinder chroming so sleeving is way cheaper.



    Quote Originally Posted by elixur View Post
    another option just try and find a 100 top end maybe hit up ebay for a part out?




    This is also very expensive and the shipping cost is over 50$ to Greece.







    What do you believe should i do the sleeving?How much will the extra power be with +15cc?Would i gain 3-4hp?And probably i would need jetting.

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    Quote Originally Posted by powerman View Post
    Here in Greece i dont have the option of culinder chroming so sleeving is way cheaper.









    This is also very expensive and the shipping cost is over 50$ to Greece.







    What do you believe should i do the sleeving?How much will the extra power be with +15cc?Would i gain 3-4hp?And probably i would need jetting.

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    I'd say that you'd notice more torque than peak horsepower with the extra displacement. If you wanted the best gain-- you'd go with VForce reeds, and a Pro Circuit or FMF pipe in conjunction with the added displacement. I'm sure you could find somebody in Europe to bore and rechrome your 85 cylinder at a decent price. I'd hit the internet and see what you find. I know they have KX100's in Europe someplace. I've seen them in Euro MX vids. Two strokes are still very popular there. --L*64

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    Quote Originally Posted by Luckystar64 View Post
    I'd say that you'd notice more torque than peak horsepower with the extra displacement. If you wanted the best gain-- you'd go with VForce reeds, and a Pro Circuit or FMF pipe in conjunction with the added displacement. I'm sure you could find somebody in Europe to bore and rechrome your 85 cylinder at a decent price. I'd hit the internet and see what you find. I know they have KX100's in Europe someplace. I've seen them in Euro MX vids. Two strokes are still very popular there. --L*64


    Yes thats true when boring a two stroke without porting you get more power in lower rpms.Yes i cant find somenone to chrome it but it costs more.Anyway i dont want to keep it a lot still and with the first chance i want to sell it to buy a bigger one so i just want some extra low budget power.





    So you believe that sleeving to 100 is a bolt on conversion?

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    You don't have to re-sleeve. Just bore out the sleeve that's already in it. IDK about getting it chromed. You may not have to-- ya may just be able to go with a bore. --L*64

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    I suggest you use a KX85 cylinder for this modification. The 85 cylinder makes much better power than the 100 cylinder.(there is a difference)



    If your looking for a rippppppppppppper, below.



    50.5mm bore x 50mm stroke=100cc (this will out perform the BB 52.5mm(100cc) cylinder or Bigger BB, hands down)

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    Υes i will use the 85 cylinder but with the kx 100 sleeve.

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    Gene-- great to see ya on here again. Are you saying that the motor is stronger when stroked, rather than bored? I have a KX100 that is fast as heck. You think it would be even faster with the 85 top end? --L*64

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    Quote Originally Posted by Luckystar64 View Post
    Gene-- great to see ya on here again. Are you saying that the motor is stronger when stroked, rather than bored? I have a KX100 that is fast as heck. You think it would be even faster with the 85 top end? --L*64




    Thanks, been busy trying to stay busy. Finally got Zac 2005 CR250 together, he went to RED BUD on Saturday race an Open class, 41 riders he took 1st................. he ran against the 450,s.........lol



    Yea the 85 cylinder is the way to go, the biggest I would bore an 85 cylinder is 50.5mm(port design reasons) Any thing bigger the power band starts getting narrow. Stroke it 50mm(100cc) or 52(105cc) bore it 50.5mm You will not be disappointed.



    The older 100cc kaw motors where set up nice right from the factory 51.8mm stroke, bore it out to a 50.5mm(104....1mm over) But then they started making the new motor in 1995.....lol

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    Gene-- My bud was up there racing the Vet Nat last week. I think he got 11th in 40+ B. He said that it rained so hard, and the track was so crappy for the second moto-- alotta guys didn't even race it. Unfortunately the guys that sat it out were behind him. I thought he said they had a huge gate of riders too. He said the 50+ guys were lightning fast too.



    About the 85/100 motor. Who makes the piston and crank you'd run in the motor you described? Wiseco? --L*64

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    It did rain but it really wasn't that bad by the end of the day the sun came out, A hand full of them where doing Loracos leap. It was a little rutty but nothing to bad. I herd over 700 riders it was pack it look like a Regional.



    Wiseco makes the piston, we custom stroke the OEM cranks in house.

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    Interesting. I have a KX85/100 mishmosh bike myself. It started out as an '05 KX100. It's now running 85 wheels, swinger, & linkage. It has an '09 KX85 bottom end and electrics, with the '05 KX100 top end bolted right on. I'm running the slightly longer '05 100 frame. It has V-Force reeds, and an FMF pipe. The bike runs pretty damn strong, and the longer frame actually adds some stability to the ride. I don't want to go through all the effort of the crank-- (mostly because I don't ride the bike very often, and I was going to get another 150R eventually). When it's time for a top end, would it be of any benefit to get an 85 cylinder bored and chromed to run with the OEM 100 piston, as opposed to just getting the stock 100 cylinder rechromed? I was just going to get the stock cylinder ported and rechromed when it wears out. If I can pick up some bottom or mid with an 85 cylinder-- it may be something I could keep in mind. --L*64

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    TWO 05 CRF 50S, 03 XR 50, 04 636, 01 400EX!

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    The 52.5,53,54.5mm pistons are to big for the port design............When we build super minis we use 85 cylinders and the 50.5 mm piston on all the models, there just isn't enough port area there to get the correct port timing it needs to get a good broad power curve.



    If you look in the exhaust port on your 100 cylinder its choked down compared to the 85 cylinder, that's one way of trying to help that 100 cylinder out(because the piston is to big for the ports).....................look at it this way a KX100 piston is 1.5mm(52.5mm they even have a 54.5 available for the 100) smaller than the 125's 54mm standard piston, so really to get a good power curve you really need the ports from the 125 in your 100 cylinder. there trying to fit 20lbs(125 piston) of potatoes in a 10lbs sack(100 cylinder/ports). I hope its making since with out me going into tech detail and really confusing ya.



    So if your looking for the best bang out of your KX100, go with the 85 cylinder bore it no bigger than 50.5. Stroke the motor down the road..........just throw a 2mm hot rod stroke crank in it making it a 96cc it will out perform the 100 cylinder with the stock stroke.



    We have done a few motors where we have made a thicker powervalve for the KX cylinder to help out in the low end.







    Gene

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    Very interesting Gene.... I may have to buy a whipped azz KX85 motor, and experimenting with it. --L*64

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    Back in 2003 I built a motor for a kid right before he went to Loretta MX National.........I took a cylinder off a 2000 KX80(48mm bore) put it on the 2003 lower end, stroked the crank 1mm it still made the displacements 85cc(48mmbore x 46.8mm stroke). We made a thicker power valve for it to help the lower end out. Made some timing adjustments. Had to modify the exhaust flange a little so the 2003 pipe would fit the 2000 cylinder...................................He called me a few days after they broke the motor in and said He noticed a big difference.

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    Lotta options with the 85/100 motors I guess. I'll address the KX100 later. I don't ride that bike a ton... and it's pretty fast already. I figured I'd run my '05 KX65 pit bike past ya while we're talking two strokes.



    I rode the 65 all the time a couple years ago, but got into my 150F's, and parked the 65 most of the time last year. I decided that the 150F makes a great race bike, but I enjoy jacking around on the 65 more when I'm riding my local pit bike track just for fun. So I've been riding the 65 quite a bit again this year. It takes a refined riding style, but it's alotta fun to roost most of the other riders on a $1000 bike made for an 8 year old when you're a + 40 year old man who's multiple times too big for the thing... haha!



    I don't want to get silly building the 65 motor. I ride it because it's cheap, fast, has good suspension and brakes, is fun, and most of all- the hard to ride nature of the thing keeps my two stroke skillz sharp. It's the 125 of pit bikes so to speak. I was wondering if a set of V-Force reeds, port job, and Pro Circuit pipe would help the power spread at all. I don't want to go through the expense of lowering the base, and milling the head on this bike-- as I want to keep the motor basically stock (yes... cheap too), and reliable for the amount of hours I put on it. Any other ideas? Should I retain the stock pipe? When I started riding the 65-- everybody said "Good luck keeping the motor together", but it's been stone solid. --L*64

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