Rule changes for F4

**Bert** · 12th April 2011, 18:10

Originally Posted by Skunk

I'm lov ing the 'only $160' type comments. I wish I had that sort of money to spare. There's a reason I have 5 TF engines sitting on my bench doing nothing.

Ebay my man:
http://cgi.ebay.com/ebaymotors/Suzuk...item4a9e6f1d93
~$60 would be here in a week.
if thats not to your liking then Akunar do a Yamaha RX series piston (very simliar to TF spec) for around 22 shipped if you can break a deal on shipping (dont expect it to last for more than a couple of runs)...

But value for money the KT ($65-75) fits the bill... but I know I felt sick paying for the crank work (still at uni at the time; good old student loan) and lasted another 4-5 years: before it all started to undo...

**kel** · 12th April 2011, 20:45

Originally Posted by Bert

Ebay my man:

Well said Bert, there's plenty of options and bargins if you have the time to look. The KE has been the beneficiary of many ebay bargins - KX125 Wiseco piston $9.99US, complete bottom end $100, rod kit $60 and the list goes on.
And the FXR piston from Akunar was $20 (had to take advantage of the extra displacement rule

)

**richban** · 12th April 2011, 22:14

If it was easy everyone would do it. Mike was smart enough to mod his engine to take the KT pistons. Seams now people want an easy road. I don't think there needs to be any rule changes just coz people don't want to do the hard yards. It is almost impossible to get an FXR to 158. You will find almost all of the oversize ones are 156. My super worked engine was making just under 26hp before it died. Thats 166hp per liter. A long way off the 200 it would need to make, to catch the 2 strokes in power. Don't go crying about the 4 strokes capacity and chopping on about peaky 2 strokes that no one can ride. Coz it be bullshit. Just makes 2 stroke riders sound like whining babies.

**speedpro** · 12th April 2011, 22:50

Not many of us do have heaps of money or time spare. My latest MB engine took about 6 years to get together mainly for financial reasons. KT pistons would cut costs and also allow the use of worn cylinders, but . . . . . . it also allows a considerable performance increase and you don't have to pay someone for that. Careful research, time with paper pencil and calculator, and hours in the garage filing ports.

It's a tricky one, possibly best left for those without a vested interest to decide.

**koba** · 13th April 2011, 07:20

Originally Posted by Gigglebutton

Get speed pro to have a look at your motor. He and Tee Zee have helped me loads

They have a long way to look...

I'm in welly but I have (and will again - If they don't get sick of it) Picked their brains a bit as well as picking the brains of our local chaps in the know. It seems I'm a brain picker. I pick my nose too.

**RMS eng** · 13th April 2011, 13:56

Originally Posted by richban

If it was easy everyone would do it. Mike was smart enough to mod his engine to take the KT pistons. Seams now people want an easy road. I don't think there needs to be any rule changes just coz people don't want to do the hard yards. It is almost impossible to get an FXR to 158. You will find almost all of the oversize ones are 156. My super worked engine was making just under 26hp before it died. Thats 166hp per liter. A long way off the 200 it would need to make, to catch the 2 strokes in power. Don't go crying about the 4 strokes capacity and chopping on about peaky 2 strokes that no one can ride. Coz it be bullshit. Just makes 2 stroke riders sound like whining babies.

a KT100 only makes 18-20HP so for a bucket a KT piston is no better than a RM100 piston, heaps on ebay you just have to look,and if your cylinder is worn out,just get another one.rules are fine.and kelly i have 5 KE125 motors most from ebay from $40.00 US to my door

**kel** · 13th April 2011, 15:21

Originally Posted by RMS eng

kelly i have 5 KE125 motors most from ebay from $40.00 US to my door

Are you offering to sell me one? dont suppose you have a cylinder under there as well?

**jasonu** · 13th April 2011, 16:15

Originally Posted by kel

Are you offering to sell me one? dont suppose you have a cylinder under there as well?

Fuck off they're mine!!!

**kel** · 13th April 2011, 17:34

Chris still spinning you that yarn?

**RMS eng** · 13th April 2011, 18:42

Originally Posted by kel

Chris still spinning you that yarn?

you got it,ones in my KX and one is to be used to make a disc valve 50cc with a derbi cylinder.

**speedpro** · 13th April 2011, 19:33

Originally Posted by RMS eng

a KT100 only makes 18-20HP so for a bucket a KT piston is no better than a RM100 piston, heaps on ebay you just have to look,and if your cylinder is worn out,just get another one.rules are fine.and kelly i have 5 KE125 motors most from ebay from $40.00 US to my door

KT100s are severely restricted porting wise hence the meagre horsepower. They do however rev and rev and rev and are well engineered to do it which makes the pistons desireable. They also come in .05mm steps and you can go to any kart shop and buy a couple of versions from a few different brands, unlike RM100 pistons.

**RMS eng** · 13th April 2011, 21:10

Originally Posted by speedpro

KT100s are severely restricted porting wise hence the meagre horsepower. They do however rev and rev and rev and are well engineered to do it which makes the pistons desireable. They also come in .05mm steps and you can go to any kart shop and buy a couple of versions from a few different brands, unlike RM100 pistons.

rm100 pistons go in 0.25mm and 0.50mm.1977-78 have 16mm pin not 14mm