Author Topic: Stroker? (Read 1708 times)

Zukman88 · « **on:** December 09, 2013, 09:47:00 pm »

As I think about how ima rebuild my first lt250r, I wonder has anyone ever tried a custom Stroker crank? Is it too much of a hassle? Not too much Maybe 2mm the most, just to get a good low end. Idk how bad it will hurt the engine but it shouldn't be that bad. Many other bikes can get strokers, but I never heard of any LT250r being that. What y'all think?

Dutch_Rutter · « **Reply #1 on:** December 09, 2013, 10:00:14 pm »

I'm kinda curious myself as I have my LT 250 completely apart in my garage waiting to be rebuilt.

LT250RWV · « **Reply #2 on:** December 09, 2013, 10:48:09 pm »

Their no stroker cranks for the lt250.. A couple builder are making big bores with a stoker setup. But it will cost you a pretty penny. Get you a good pipe reeds carb port job head mod. You will have you good 250.

All American · « **Reply #3 on:** December 09, 2013, 10:57:28 pm »

I hope you have an extra 5 G's or more if you decide to peruse it. It's literally a one of a kind setup with major design hurdles and major milling of custom parts. definately not for the faint of heart. I spoke with a builder who's doing it, and it's no small weekend project. That's all I'm going to share. I wouldn't want to make anybody mad at me for giving too much up.

Dutch_Rutter · « **Reply #4 on:** December 09, 2013, 10:59:29 pm »

well i'm out, i'm not going to radical with mine, but you should Zukman and let me know how it is

Just a quick side note not to hijack or anything, but what is the head mod?

All American · « **Reply #5 on:** December 09, 2013, 11:02:12 pm »

Quote from: Dutch_Rutter on December 09, 2013, 10:59:29 pm

well i'm out, i'm not going to radical with mine, but you should Zukman and let me know how it is Just a quick side note not to hijack or anything, but what is the head mod?

Squash maybe? Or o ring?

LT250RWV · « **Reply #6 on:** December 10, 2013, 12:53:11 am »

Correct the squish band also to have your head oring. So you dont have to run headgasket anymore. It really helps the running of your quad.

Dutch_Rutter · « **Reply #7 on:** December 10, 2013, 12:57:27 am »

I'm going to have to do this when I'm putting mine back together. I'm excited about having this run better then Good by simple mods like this.

1986QuadRacer · « **Reply #8 on:** December 10, 2013, 01:11:08 am »

A couple grand would build a nice Zilla motor

All American · « **Reply #9 on:** December 10, 2013, 01:24:24 am »

Quote from: Dutch_Rutter on December 10, 2013, 12:57:27 am

I'm going to have to do this when I'm putting mine back together. I'm excited about having this run better then Good by simple mods like this.

Talk to iceracer, he was a dream to deal with. Not a single complaint

Iceracer · « **Reply #10 on:** December 10, 2013, 07:35:07 am »

TO stroke an engine properly your looking at a minimum of $1000 to do rite. It requires a rod kit, knowing the range of piston weights you will be using so the crank can be balanced correctly. Crank alone will cost you better than 700. It will make more low end power, BUT can reduce RPM you can run at for peak power this may or may not be a good thing depending on your pipe setup and other variables.
It requires Different porting, due to the stroke this is a major reason most 4 mil Hondas run like a turd. It may change where your cylinder needs to be placed (spacer plate) depending on length of stroke. It will require a nice set of cases to be clearanced for the rod due to the location of the pin some engines do this mod themselves when the washers let go

. Stroking 2 mm is not worth the added effort, 4mm I guess well see, up to 6 is possible, anything beyond that probably wont fit without sealing issues unless major welding of the cases and re machining is done $$$$$$.

Unfortunately Kawie and Suzuki got hosed by the aftermarket from the beginning. Honda got all the cool aftermarket stuff for cheap. You can build a 4mil Honda big bore from ESR for under 1200. I cant turn on the lights in my shop after buying the parts to do a LT for what they can sell em for ready to run. Hell even a Kawie you can make a 317- 330 for 500-1000 with just a piston and Rod change no stroke at all.
You have to really love a Suzuki to bother. But I guess that why were here.

Dangerouspower · « **Reply #11 on:** December 10, 2013, 03:15:24 pm »

Carl who built that crank ? Crankworks?

Zilla273 · « **Reply #12 on:** December 10, 2013, 04:25:17 pm »

Carl, have u done any stock bore strokers on the lt's?

Iceracer · « **Reply #13 on:** December 10, 2013, 05:05:27 pm »

Yes cw, no a small bore is on the list for later. Once you get this far into something its kind of a waste to not do it all the first time around. I can drop a smaller cylinder on it anytime down the road. Should be all done in a couple weeks. Then well see what happens.

Dangerouspower · « **Reply #14 on:** December 10, 2013, 05:09:51 pm »

Mind me asking how much its + stroke? And did you keep the LT rod?

Zukman88 · « **Reply #15 on:** December 10, 2013, 05:26:01 pm »

Thanks for the opinions but I'm shocked at how much this could cost. I'm not talking bout 4 to 5mm I'm just thinking 2. And keep it stock maybe .20 over on bore and nice port work to line up with the ports. I got a 3mil 240 blaster back in VA. Didn't need a trenching to cases, but I know it could be a more affordable way to customize a lil stroke increase. And to make up rpm I would get vforce reeds shearer pipe and gear changes plus a pwk or pj carb. It would take a lot of comparing other cranks and motors to see if it can really work. And y'all right aftermarket just never praise suzuki enough to up some hp.

Iceracer · « **Reply #16 on:** December 11, 2013, 11:17:52 am »

Zuk, just so you know, .5mm-8mm all cost the same to stroke. You might be able to get away with and live with not balancing the crank at+2, not a risk I'm willing to take, and you really need to be sure and put a new rod kit on it. Its not worth the trouble if you don't, they have to weld the pin on them.
DP, its a 4mil, no its not a Lt rod.

Zukman88 · « **Reply #17 on:** December 11, 2013, 04:17:18 pm »

Dam thanks for the advice. It's all about cost and I know I have too much on the plate to add on more finances, but maybe one day

PCS · « **Reply #18 on:** December 11, 2013, 10:59:52 pm »

http://crankworks.com/index.php/crank-services

MotorGeek - Jerry Hall · « **Reply #19 on:** December 12, 2013, 08:07:13 am »

Quote from: Zukman88 on December 09, 2013, 09:47:00 pm

As I think about how ima rebuild my first lt250r, I wonder has anyone ever tried a custom Stroker crank? Is it too much of a hassle? Not too much Maybe 2mm the most, just to get a good low end. Idk how bad it will hurt the engine but it shouldn't be that bad. Many other bikes can get strokers, but I never heard of any LT250r being that. What y'all think?

Why do you want a stroker crank?

?.

Are you going to become another victim of all of the hype generated by those that may not look for what may be the best for their customers.

The engineers at Suzuki spent who knows how much money testing different bore and stroke combinations for the best power/reliability design. Increasing the displacement by stroking does not guarantee that there will be more low end or any more peak power. Two-strokes do not respond to stroke changes like four-strokes. Shops that build stroker crankshafts specialize in modifying or building stroker cranks to a customers specifications or request, not re-designing the rest of the engine so that the whole engine is more reliable and powerful. If you want a 25mm stroker crank they will build it if there is a place in the crank web for relocation of the crankpin. They do not care if the stroker crank is going to work with the rest of your engine and pipe combination.

Changing the stroke of the engine requires a complete RE-DESIGN of the whole power making portion of the engine to optimize the engine for the new stroke. The ports, cases, exhaust system etc are influenced by the stroke.

If you decide to go down the road of stroker cranks, find an engine builder that has spent a lot of money field and dyno testing to optimize the new engine design.

I have NEVER seen a stroker crank that has the same outside diameter crank webs as the stock crank that is stronger than the stock crank. Why increase the power of an engine and decrease the strength of the crank. I get 5 to 10 calls a day from guys wanting to increase the power of their engine and wanting to keep the reliability of a stock engine. This is not rocket science.

Mgty3Whlr · « **Reply #20 on:** December 28, 2013, 01:03:59 pm »

When I did my 4mm 88 LT250, I had to trench the cases so the rod would clear.
I couldn't imagine fitting a 6 or 8mm stroker in the cases without some extensive welding because, with a 4mm, there wasn't a whole bunch of sealing area.

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Author Topic: Stroker? (Read 1708 times)

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