Planet Minis

benjaidafufukil · 10-01-2008, 02:51 AM

Hi there people,

I have 2 KLX motors with:

- Take 138 + R
- 55mm stroker
- VM26 (one Take / one Kitaco)

I was wondering if porting was really needed for these motors, or if the gain on a 150cc will not be too noticeable?

My second option was to build a Kitaco 143 4Valve (we are limited to 150cc on the french championship so I can t go 160cc). The only thing is nobody in France runs the motor so I have absolutly no feedback.

Is anyone running a Kitaco 4Valve on this forum? How does it perform against a 150+R?

Thx,

Ben

benjaidafufukil · 10-01-2008, 02:53 AM

I also would like to know what type of porting could be needed for the +R head? Would you only redo the intake and match it to the boot and redo exhaust too?

benjaidafufukil · 10-01-2008, 04:58 PM

Anyone?

chasetheface123 · 10-01-2008, 05:01 PM

ok dude teh kitaco 4 valve freekin rips from what i hear. dominates r heads and anything alike.

chasetheface123 · 10-01-2008, 05:01 PM

talk to dnrcustoms which is derrick rose i beliv ehe has one

Zachmotox179 · 10-01-2008, 05:05 PM

well i guess it all depends if you want to spend a few hundred in porting or $1500 on a new motor kit and have to split the cases again to take out the stroker crank.

Paxracing · 10-01-2008, 05:13 PM

Quote:

Originally Posted by benjaidafu***il

Hi there people,

I have 2 KLX motors with:

- Take 138 + R
- 55mm stroker
- VM26 (one Take / one Kitaco)

I was wondering if porting was really needed for these motors, or if the gain on a 150cc will not be too noticeable?

My second option was to build a Kitaco 143 4Valve (we are limited to 150cc on the french championship so I can t go 160cc). The only thing is nobody in France runs the motor so I have absolutly no feedback.

Is anyone running a Kitaco 4Valve on this forum? How does it perform against a 150+R?

Thx,

Ben

What pipe.

2wheeltyson · 10-01-2008, 05:23 PM

i have had a couple +R heads, 1 not ported 1 ported by mike castro. if the right person ports it it's definately worth it. i have rode dereks 160 4V and it does rip, it was better than my 194+R. but it uses valve shims instead of tappet screws and needs adjusted frequently. if i was a serious racer i would want the 4V, but since i'm old and slow i downgraded to a 138+R (with porting)

HI-TECH HORSEPOWER · 10-02-2008, 12:24 PM

On almost all heads there's room for improvment. Our built TB155 with there new V2 head/Ported compared to Derek 4V head, the torque on the TB155 is only 0.3 ftlbs of torque away from Dereks torque specs on his 160 motor with the 4V head. I going to try an other cam to see if we can match or beat those torque numbers.

Because of the two different cam specs, Dereks 4V peak torque is between 7,700-8,700 rpms our TB 2V peak torque is at 6,700-7,700.(Both are ported)

The answer to your question is, Yes porting helps.

Gene

aedwards07 · 10-02-2008, 12:44 PM

Gene,
What kinda torque numbers are you looking at?Im at 11.19 on a bolted together 172+R with the S20 cam.Just curious how it compares.

HI-TECH HORSEPOWER · 10-02-2008, 03:32 PM

Quote:

Originally Posted by aedwards07

Gene,
What kinda torque numbers are you looking at?Im at 11.19 on a bolted together 172+R with the S20 cam.Just curious how it compares.

160/Derek 4V= 11.4 torque
155/Zac 2VTB=11.1 torque

Gene

chasetheface123 · 10-02-2008, 03:38 PM

hey gene just outta courisoty whats the stock torque of a yx 150 if you know?

HI-TECH HORSEPOWER · 10-02-2008, 04:17 PM

Quote:

Originally Posted by chasetheface123

hey gene just outta courisoty whats the stock torque of a yx 150 if you know?

Sorry havent had one of those on the dyno.

mototim · 10-02-2008, 04:22 PM

Quote:

Originally Posted by hi-tech horsepower

160/derek 4v= 11.4 torque
155/zac 2vtb=11.1 torque

gene

just curious how much hp

benjaidafufukil · 10-02-2008, 04:40 PM

Quote:

Originally Posted by Paxracing

What pipe.

Yoshimura Ti pipe

HI-TECH HORSEPOWER · 10-02-2008, 06:32 PM

Quote:

Originally Posted by mototim

just curious how much hp

160/Derek 4V= 11.4 torque---19.1h.p.
155/Zac 2VTB=11.1 torque---16.9h.p.

HI-TECH HORSEPOWER · 10-05-2008, 12:46 PM

Quote:

Originally Posted by aedwards07

Gene,
What kinda torque numbers are you looking at?Im at 11.19 on a bolted together 172+R with the S20 cam.Just curious how it compares.

What carb are you running? What RPM did the peak torque(11.19) take place?
What pipe?

benjaidafufukil · 10-05-2008, 12:54 PM

Nobody really seems to be answering my original question

Paxracing · 10-05-2008, 01:06 PM

If your question is "are you going to gain horsepower by just porting the R head"? No. It's all in combinations, pipe, carb, cam, gas, ect.... We have been porting bikes for over 18 years there was a guy on here that everyone said how good his porting was, so I sent some up to him and with the combination we run I lost horsepower.

10-01-2008, 02:51 AM	#1 (permalink)
benjaidafufukil 2nd Gear Member Join Date: May 2007 Location: Paris, FRANCE Posts: 455	Porting a +R head or moving to something else Hi there people, I have 2 KLX motors with: - Take 138 + R - 55mm stroker - VM26 (one Take / one Kitaco) I was wondering if porting was really needed for these motors, or if the gain on a 150cc will not be too noticeable? My second option was to build a Kitaco 143 4Valve (we are limited to 150cc on the french championship so I can t go 160cc). The only thing is nobody in France runs the motor so I have absolutly no feedback. Is anyone running a Kitaco 4Valve on this forum? How does it perform against a 150+R? Thx, Ben

10-01-2008, 02:53 AM	#2 (permalink)
benjaidafufukil 2nd Gear Member Join Date: May 2007 Location: Paris, FRANCE Posts: 455	Re: Porting a +R head or moving to something else I also would like to know what type of porting could be needed for the +R head? Would you only redo the intake and match it to the boot and redo exhaust too?

10-01-2008, 04:58 PM	#3 (permalink)
benjaidafufukil 2nd Gear Member Join Date: May 2007 Location: Paris, FRANCE Posts: 455	Re: Porting a +R head or moving to something else Anyone?

10-01-2008, 05:01 PM	#4 (permalink)
chasetheface123 Chuck Norris for president! Join Date: Nov 2007 Location: Boyne City Michigan Posts: 4,811 My Mood:	Re: Porting a +R head or moving to something else ok dude teh kitaco 4 valve freekin rips from what i hear. dominates r heads and anything alike.

10-01-2008, 05:01 PM	#5 (permalink)
chasetheface123 Chuck Norris for president! Join Date: Nov 2007 Location: Boyne City Michigan Posts: 4,811 My Mood:	Re: Porting a +R head or moving to something else talk to dnrcustoms which is derrick rose i beliv ehe has one

10-01-2008, 05:05 PM	#6 (permalink)
Zachmotox179 3rd Gear Member Join Date: Jan 2007 Location: NH 03051 Posts: 3,073	Re: Porting a +R head or moving to something else well i guess it all depends if you want to spend a few hundred in porting or $1500 on a new motor kit and have to split the cases again to take out the stroker crank.

10-01-2008, 05:23 PM	#8 (permalink)
2wheeltyson 3rd Gear Member Join Date: May 2005 Location: michigan Posts: 1,653	Re: Porting a +R head or moving to something else i have had a couple +R heads, 1 not ported 1 ported by mike castro. if the right person ports it it's definately worth it. i have rode dereks 160 4V and it does rip, it was better than my 194+R. but it uses valve shims instead of tappet screws and needs adjusted frequently. if i was a serious racer i would want the 4V, but since i'm old and slow i downgraded to a 138+R (with porting)

10-02-2008, 12:24 PM	#9 (permalink)
HI-TECH HORSEPOWER 1st Gear Member Join Date: Oct 2006 Location: Michigan Posts: 217	Re: Porting a +R head or moving to something else On almost all heads there's room for improvment. Our built TB155 with there new V2 head/Ported compared to Derek 4V head, the torque on the TB155 is only 0.3 ftlbs of torque away from Dereks torque specs on his 160 motor with the 4V head. I going to try an other cam to see if we can match or beat those torque numbers. Because of the two different cam specs, Dereks 4V peak torque is between 7,700-8,700 rpms our TB 2V peak torque is at 6,700-7,700.(Both are ported) The answer to your question is, Yes porting helps. Gene

10-02-2008, 12:44 PM	#10 (permalink)
aedwards07 3rd Gear Member Join Date: Jan 2004 Location: Kissimmee,FL Posts: 5,873	Re: Porting a +R head or moving to something else Gene, What kinda torque numbers are you looking at?Im at 11.19 on a bolted together 172+R with the S20 cam.Just curious how it compares.

10-02-2008, 03:38 PM	#12 (permalink)
chasetheface123 Chuck Norris for president! Join Date: Nov 2007 Location: Boyne City Michigan Posts: 4,811 My Mood:	Re: Porting a +R head or moving to something else hey gene just outta courisoty whats the stock torque of a yx 150 if you know?

10-05-2008, 12:54 PM	#18 (permalink)
benjaidafufukil 2nd Gear Member Join Date: May 2007 Location: Paris, FRANCE Posts: 455	Re: Porting a +R head or moving to something else Nobody really seems to be answering my original question

10-05-2008, 01:06 PM	#19 (permalink)
Paxracing 3rd Gear Member Join Date: Mar 2004 Location: ca Posts: 5,517 My Mood:	Re: Porting a +R head or moving to something else If your question is "are you going to gain horsepower by just porting the R head"? No. It's all in combinations, pipe, carb, cam, gas, ect.... We have been porting bikes for over 18 years there was a guy on here that everyone said how good his porting was, so I sent some up to him and with the combination we run I lost horsepower.

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