New Member Big Bore Stroker Question By dirtrider1219 (Read 2,077 times)

[dirtrider1219]

Oct 25, 2015 19:29:24 GMT -6 czmdiver said:

Oct 25, 2015 17:58:30 GMT -6 dirtrider1219 said:

Thanks diver. I'm leaning toward the original stroker kit because I love displacement   I was thinking about ceramic coating the piston as well. Never tried it but have heard good things about it and should help reduce friction from the aggressive rod angle. I will probably start a new build thread and I can also document any differences between the p engines and non p engines. 

You mean a Ceramic Thermal Barrier Applied to the Dome correct?

Yep, and possibly the skirts?

[czmdiver]

www.polydyn.com/performance_coatings.htm
These folks got it going on. Ive used them for Piston Domes, Skirt Coates and Header Coatings.
You won't be putting Ceramic on the Skirts. They use the Ceramic to Reinforce there Dry Film on the Skirt coat.

[dirtrider1219]

I will certainly check them out diver thanks. I think I'm going to pull the trigger on that kit in the original post tomorrow Any more advice or warnings from anyone before I do so my motor doesn't go boom

[jct842]

Damn, a guy could easily spend a couple thousand on a big gy6 making 2 times as much power as it was originally designed for. Same guy could get a pretty dang nice used motorcycle for that kind of money. And expect it to last at least long enough to get it paid for!

Don't get me wrong, I like to mess with scooters too, but spending thousands on one only to get beat at a stop light with a 25 year old suz 400 that cost $475 on craigs list that will still be running long after the big gy6 pukes gobs of broken parts on the sidewalk isn't my kind of a good deal.

[richardv]

Oct 25, 2015 21:52:59 GMT -6 jct842 said:

Damn, a guy could easily spend a couple thousand on a big gy6 making 2 times as much power as it was originally designed for. Same guy could get a pretty dang nice used motorcycle for that kind of money. And expect it to last at least long enough to get it paid for!

Don't get me wrong, I like to mess with scooters too, but spending thousands on one only to get beat at a stop light with a 25 year old suz 400 that cost $475 on craigs list that will still be running long after the big gy6 pukes gobs of broken parts on the sidewalk isn't my kind of a good deal.

You got that right. I can buy a '06 Honda VTX1300 for the price of a 250/300cc scooter and drive it across the country on one oil change. But it doesn't have the step through, almost, frame and the fun of the modification.  The insurance is higher as well on the motorcycle.

[cyborg]

This is one of my big bones of contention as well,,,a good quality scooter costs alot of money,,,still not as much as a full size motorcycle but plenty expensive none the less,,,,,i nosed around CL got a gently used and stored for years nonop dr350 dualsport with 11-1200 miles for a grand $875 in carb pipe and some other dodads and it will run rings around my new stella for a few hundred less,,,,i did get a year and a half left over stella but still new with 2 miles or so on it ,,,its all what you want,,i used the stella to commute on and grocery runs,,,the dr is the ride machine,

[jaxrhapsody]

Oct 25, 2015 21:52:59 GMT -6 jct842 said:

Damn, a guy could easily spend a couple thousand on a big gy6 making 2 times as much power as it was originally designed for. Same guy could get a pretty dang nice used motorcycle for that kind of money. And expect it to last at least long enough to get it paid for!

Don't get me wrong, I like to mess with scooters too, but spending thousands on one only to get beat at a stop light with a 25 year old suz 400 that cost $475 on craigs list that will still be running long after the big gy6 pukes gobs of broken parts on the sidewalk isn't my kind of a good deal.

True, but its a different class of motorbike. I don't see why anybody would be wanting to race a motorcycle with a scooter, unless it was a Grom, or something. It's about working within the limitations. It's like why fix up that foxbody with a built 5.0 stroker, and a cobra irs, when you can buy a new v6 mustang and have a much better car, well, because. Some one wants to build up a scooter, and blow the engine, well engines can be gotten cheap.

Why own a scooter if a motorcycle is better? Mopeders spend time with 70&80cc stroker kits, tiny drum brakes, and sometimes try and make twin variation work, all that when they can just buy a scooter? There are people that trick out gopeds, even running them off nitro, well a moped is a step above that. It's a hobby- modding things to drive, or ride, there are better things higher on the food chain, scooters to mopeds, sports cars to muscle cars, hyper cars to sports cars. Tbey all exist for a reason. I just want to build an awesome scooter, and worry about even a honda rebel would be a better alternative to almost any scooter. I still wany a moped, because it's about the scene.

[Alleyoop]

I hope the OP has checked his current motor casing and checked if when bored out to take the 63mm there will be enough meat around the stud holes and the chain wall. Here is a 63mm that left paper thin walls and it did not last even a ride it blew up after starting it and adjusting it.
Notice the missing pieces around the studs and chain wall.
Alleyoop

[czmdiver]

Oct 26, 2015 11:43:38 GMT -6 Alleyoop said:

I hope the OP has checked his current motor casing and checked if when bored out to take the 63mm there will be enough meat around the stud holes and the chain wall. Here is a 63mm that left paper thin walls and it did not last even a ride it blew up after starting it and adjusting it.
Notice the missing pieces around the studs and chain wall.
Alleyoop


Wow total butcher job, How can anybody overlook that?
And the Sloppy Permatex

[czmdiver]

Something else to consider.

For the No Case Bore NCY Iron Lined Cylinder on Right has a Bare Minimum Flange Thickness of .039 or 1mm make it a lille sketchy for me.
The Case Bore Plated Taida Cylinder has a Much Thicker Flange. My Choice.

[Alleyoop]

That is how NCY can say their 61mm no boring is required, they turn down the Jug and now you have a much thinner cylinder lining. By the way that pic of blown up 63mm is actually NCY's bored out casings.

[jct842]

The only point I am trying to get across is there is a time to stop when "hopping up" a gy6 where no matter how neat the build is. Unless you are building a grenade.

NASCAR motors make almost triple what a stock 350 auto engine makes in hp. But they are not anything close to a stock engine, not one part from the block on down is interchangable with any makers car. Still a 355ci design. Each part is made with the finest metal available. Engine life is designed for possibly 900 miles and they still blow them up in a 500 mile race.

Going back to our gy6 not one part is made of the finest materials. A motor built up from one designed to be around 100cc and some one stretchs it all the way up to 232cc. Looks to me more like a grenade than a motor! If I built one I would want some sort of a scatter shield over it to protect the family jewels.

[cyborg]

ouch and double ouch,,,i love the non concentric case bore job,,,must have been cut by gomez adams,,,,maybe pugsley or fester

[Alleyoop]

Oct 26, 2015 16:32:33 GMT -6 cyborg said:

ouch and double ouch,,,i love the non concentric case bore job,,,must have been cut by gomez adams,,,,maybe pugsley or fester

Do they work for NCY? Guy paid good money for the TWO halves and he did not notice the clearance problem. He just slapped the crank in and buttoned the two halves together and slapped the top end on lit it up and

[jaxrhapsody]

All the reason I'm leaving my engine alone, sans intake, and exhaust. Unless I win the free cad/haas session lottery, and can have custom built engine, and case.