a couple questions about stroker engines

[kevbo]

It may or may not be cheaper in the long run to get someone else to do it however what will you learn by doing that? Isn't the whole point of these forums to exchange information and learn something? We could answer most questions by saying "Take it to the dealer to fix it", but that wouldn't make very interesting reading.

Just tell me what is cool and where to swipe my credit card, thats all that matters. Its nearly impossible to find good information for parts that already exist. Product development people don't seem to ride at all and they certainly
don't want to give away what they have learned.

 

[SUPERTUNE]

Yes, I do have riders help me develop engine packages because I'm so high up in horsepower with these bigger X Scream 1000cc engines I can't really feel how to tune them because when I hit the throttle, the ski throws me off or jumps completely out of the water!

 

[freestylegeek]

...*means degrees cause i havent figured out where that symble is on the keyboard...

Hold down the 'Alt' key, then type in 167 in the keypad, then release the 'Alt' key.

 

[eel]

Here are a few questions about stroker engines that are rarely asked.

1: Do I need one?

2: Am I better off spending my money on other mods?

3: What are the pro's and cons?


I have my opinions but it would be interesting to see others valued opinions on these questions.

 

[egbrig]

Goose, 128 total duration on the transfers is good as well as the 190 on the exhaust. Exhaust shape is important as well as other factors but those two are good.

 

[Goose]

Goose, 128 total duration on the transfers is good as well as the 190 on the exhaust. Exhaust shape is important as well as other factors but those two are good.

thats the first post in this thread that was useful thanks alot

 

[SUPERTUNE]

Be easy on me now... It takes a recipe formula to make port mapping work right for a specific target rpm range. Its all in the total package. I have never copied port spec's from any other engine builders, I have tried all different types of porting myself and that's how I learned what I wanted in freestyle horsepower and not racing horsepower. (big difference) All engines are not ported the same.
Stock 61x, re-sleeved big bore 61x, ADA monster bore cylinders, Lamey 7 port cylinders all use different mapping.

 

[stuntbikemike]

Chuckie ....you can't teach old dogs new tricks.....let them spend all there money and time just to have a unreliable set up......they need to ride a TEAM SCREAM setup to know ITS THE BEST SETUP.......

And to other members of this forum.....You know chuck as more work to do than any other builder in the nation....When he answers your questions.....THATS THE FACT. Im surprised he even answers qs on here....Just a nice guy who wants to better the sport with quality workmenship...I wouldn't trust anybody else with my boats ....EVER....:woot:

 

[Boris]

Chuckie ....you can't teach old dogs new tricks.....let them spend all there money and time just to have a unreliable set up......they need to ride a TEAM SCREAM setup to know ITS THE BEST SETUP.......

And to other members of this forum.....You know chuck as more work to do than any other builder in the nation....When he answers your questions.....THATS THE FACT. Im surprised he even answers qs on here....Just a nice guy who wants to better the sport with quality workmenship...I wouldn't trust anybody else with my boats ....EVER....:woot:

Amen

 

[SuperJETT]

And to other members of this forum.....You know chuck as more work to do than any other builder in the nation....When he answers your questions.....THATS THE FACT.

There is more than one way to skin a cat. Chuckie does great with his techniques, so do other builders.

I learned back when I had an engine built by George Grabowski that there are different approaches to engine building, even though they all use the same principles.

 

[Big Kahuna]

Chuckie ....you can't teach old dogs new tricks.....let them spend all there money and time just to have a unreliable set up......they need to ride a TEAM SCREAM setup to know ITS THE BEST SETUP.......

And to other members of this forum.....You know chuck as more work to do than any other builder in the nation....When he answers your questions.....THATS THE FACT. Im surprised he even answers qs on here....Just a nice guy who wants to better the sport with quality workmenship...I wouldn't trust anybody else with my boats ....EVER....:woot:

There is more than one way to skin a cat. Chuckie does great with his techniques, so do other builders.

I learned back when I had an engine built by George Grabowski that there are different approaches to engine building, even though they all use the same principles.

Darin beat me to it!!!!!!!!

There are many builders out there that all build great motors. They may all take different routes to get to the same place.......

 

[stuntbikemike]

IMO from the ******** ive seen Chucky's way will be the best....And i do mean the best....but you keep thinking what you want...youll learn one dayIMO

 

[freestylegeek]

This thread has veered a little off topic, but here is what MacDizzy says about engine builders and their philosophy:

"Two stroke engine builders may be able to gain more respect from their customers when they learn to not keep as many secrets about what it is they do. The customers who sit on the fence for a long time before choosing to modify or not do so because they can not justify the associated costs - they have nothing to judge them against. It is very unlikely that every person the engine builder tells his tuning strategy to will have the ability to perform, skill to achieve, money for tooling, patience to learn or the mechanical aptitude to carry out the given tasks which are necessary to over ride them in order to do the work themselves. In fact the reverse may well be true. It is possible that once a person understands what is involved in the two stroke power building process they may be more willing to trust the engine builder and offer less resistance when it comes to buying more products or services because they have been educated about the processes. Many people want to understand what's being done to their favorite ride so they can tell their riding friends more than the dollar amount associated with the new found speed they're experiencing."

That has always been a HUGE factor in who I pick to do any work for me.

Back on topic. Goose, I would strongly recommend calling some engine builders and talking with them about what your desired outcome is. That will be FAR more informational than trying to get information from the boards.

 

[#ZERO]

So after a few days of research i came up with this.if i use 82mm kawie flat top pistons and a stock 61x cylinder and sleeves. I will take around 1.27mm off the bottom that will set my port timing up as follows
*means degrees cause i havent figured out where that symble is on the keyboard
85*my exhaust port will open
116*my transfers will open
190 degrees exhaust duration
128 degrees intake duration
30 degree blowdown



is that an ok area to shoot for with port timing

The specification you mentioned might work well if you're building a superstock engine but it's not going to work well for freestyle use. If you were to remove the sleeves and make the counterbore lower to line up the transfer ports with the 61x cylinder casting it would make the port timing more usable but if you're going to all this trouble to machine the cylinder you might as well install some big bore sleeves with better port timing that are made for the flat tops. Also the Kawasaki pistons don't work well with the 61x sleeves because ring pin rides right on the edge of the auxiliary transfer ports and at the 82mm bore size you're only going to have one overbore.