Planet Minis

MiniObsessed · 08-28-2005, 05:03 PM

what is the biggest big bore kit they make for a crf/xr 70? thanks in advance

p3racer · 08-28-2005, 05:43 PM

95cc bigbore or 124cc stroker

MiniObsessed · 08-29-2005, 08:15 AM

where would i go and get the 95 kit?

p3racer · 08-29-2005, 08:27 AM

dratv.com you have to bore the cases for it

five0addict · 08-29-2005, 11:17 AM

tb 88 with race hed piston

imported_Imaposer · 08-30-2005, 09:02 AM

Quote:

Originally Posted by five0addict

tb 88 with race hed piston

When building a 70, is it worth going to the TB race head or does the stock 70 head flow well enough? If I keep the stock head, what needs to be done to it such as valve springs, cam, etc?

p3racer · 08-30-2005, 09:04 AM

STOCK 70 HEAD WONT COMPAIR TO A TB HEAD I WOULD GET THE TB RACE HEAD KIT AS IT IS THE BEST BUY FOR THE MONEY AND MOST RELIABLE MOST POWER

imported_Imaposer · 08-30-2005, 09:14 AM

Damn, I was afraid of that. I was hoping to save a few bucks on the head when I build my daughters 70. I thought that maybe i could just go with the TB88 cylinder, the correct piston for the 70 head, a cam with springs and a carb with intake and come out cheaper than buying the complete head.

p3racer · 08-30-2005, 09:27 AM

the 88 bigbore for stock 70 head with a TB race cam and rev box with the stock 70 intake and carb with a clamp on uni filter and a pipe will make it way better than a stock 70 if you do need a pipe I have a FMF for 65 bucks shipped I also have a tb 20mm carb and intake for 60 bucks and even have a used LA sleeve 88cc bore kit with a web cam for 135 bucks it has a billet aluminum steel sleeved cyclinder tell you what I will sell the whole set up with jets for the 20 carb for 260 shipped with a new gasket kit

p3racer · 08-30-2005, 09:33 AM

Quote:

Originally Posted by BrandXMinis

We took both a 70 head and a TB style race head to the machinist to get valve job and port and polish. This info can be all wrong, but when the company reviewed both of the heads, he said to get all the work done to the 70 head. I don't know what the pro's were to go with the 70 head as I do not even get into that kind of work, but he said we would make more power. Hopefully in the next month or so we can get some dyno number to compare though.

i have heard and seen the same

imported_Imaposer · 08-30-2005, 10:25 AM

So, you're saying that the Honda head has more potential than the TB if you were having extensive head work done but that in stock form the TB head is much better. Right?

five0addict · 08-30-2005, 11:01 AM

cheap build (im doing this without the cam tho)
tb88 cylender
tb88 race head piston
tb88 race camshaft

i did a home port cleanup. theres many resrictions in the 70 head. i also polished the combustion chamber and valve seats. idk how it will help but ill see.

you dont need HD valve springs on the 70

08-28-2005, 05:03 PM	#1 (permalink)
MiniObsessed PM Newbie Join Date: Nov 2004 Location: Michigan Posts: 12	crf/xr70 big bore what is the biggest big bore kit they make for a crf/xr 70? thanks in advance

08-28-2005, 05:43 PM	#2 (permalink)
p3racer Founding Member Join Date: Sep 2003 Location: FLORIDA Posts: 6,285	95cc bigbore or 124cc stroker

08-29-2005, 08:15 AM	#3 (permalink)
MiniObsessed PM Newbie Join Date: Nov 2004 Location: Michigan Posts: 12	where would i go and get the 95 kit?

08-29-2005, 08:27 AM	#4 (permalink)
p3racer Founding Member Join Date: Sep 2003 Location: FLORIDA Posts: 6,285	dratv.com you have to bore the cases for it

08-29-2005, 11:17 AM	#5 (permalink)
five0addict T'AINT NO THING! Join Date: Dec 2003 Location: Atascadero CA!!! Posts: 4,428	tb 88 with race hed piston

08-30-2005, 09:04 AM	#7 (permalink)
p3racer Founding Member Join Date: Sep 2003 Location: FLORIDA Posts: 6,285	STOCK 70 HEAD WONT COMPAIR TO A TB HEAD I WOULD GET THE TB RACE HEAD KIT AS IT IS THE BEST BUY FOR THE MONEY AND MOST RELIABLE MOST POWER

08-30-2005, 09:14 AM	#8 (permalink)
imported_Imaposer 2nd Gear Member Join Date: Feb 2005 Location: Newnan, GA Posts: 308	Damn, I was afraid of that. I was hoping to save a few bucks on the head when I build my daughters 70. I thought that maybe i could just go with the TB88 cylinder, the correct piston for the 70 head, a cam with springs and a carb with intake and come out cheaper than buying the complete head.

08-30-2005, 09:27 AM	#9 (permalink)
p3racer Founding Member Join Date: Sep 2003 Location: FLORIDA Posts: 6,285	the 88 bigbore for stock 70 head with a TB race cam and rev box with the stock 70 intake and carb with a clamp on uni filter and a pipe will make it way better than a stock 70 if you do need a pipe I have a FMF for 65 bucks shipped I also have a tb 20mm carb and intake for 60 bucks and even have a used LA sleeve 88cc bore kit with a web cam for 135 bucks it has a billet aluminum steel sleeved cyclinder tell you what I will sell the whole set up with jets for the 20 carb for 260 shipped with a new gasket kit

08-30-2005, 10:25 AM	#11 (permalink)
imported_Imaposer 2nd Gear Member Join Date: Feb 2005 Location: Newnan, GA Posts: 308	So, you're saying that the Honda head has more potential than the TB if you were having extensive head work done but that in stock form the TB head is much better. Right?

08-30-2005, 11:01 AM	#12 (permalink)
five0addict T'AINT NO THING! Join Date: Dec 2003 Location: Atascadero CA!!! Posts: 4,428	cheap build (im doing this without the cam tho) tb88 cylender tb88 race head piston tb88 race camshaft i did a home port cleanup. theres many resrictions in the 70 head. i also polished the combustion chamber and valve seats. idk how it will help but ill see. you dont need HD valve springs on the 70

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