Planet Minis

fastbmw · 12-28-2009, 12:11 PM

My "beater" ZB won't run anymore (Can't seem to figure it out, but it's a 72cc big head but it was cobbled together with a mishmash of parts and I'm sick of monkeying with it) so I figured I'd throw a BBK kit at it instead of trying to ressucitate it. I know I have an e22 head and a solid bottom end so I figured I could either get a TB 88cc racehead kit TB 88cc Bore Kit for Race / e22/ CRF70 head

or go for an entire 90 cc piranha Piranha 90cc Engine.

Pros for TB 88; stick with Honda bottom end and lighting stator
Cons; have to buy assorted bits, such as intake, throttle cable, etc. making the cost more than the Piranha. Already have a ZB with this basic kit.

Pros for Piranha; I can basically drop it in (adding my 18mm carb I have sitting in the garage), plus have a 4spd semi-auto.
Cons; have to swap lighting stator over to the new engine, unknown quality of the piranha.

What do you guys think?

daddysmut · 12-28-2009, 12:16 PM

if you're on the street, get the engine....it's worth it just to have the extra gear. i'd save up for a 125 tho

AngryDirtbikers17 · 12-28-2009, 11:14 PM

i just got the piranha 90 for xmas..havent gotten a chance to ride it yett...soon as i rip it ill let you know how it is..seems to be awsome motor!

s_10onbagz · 12-29-2009, 02:18 PM

You might have to do some work to get it up to the acceleration of a tb88rh, but it should be a nice start. Maybe a 54mm crank for a 69mm jug if it fits.

tmas · 12-29-2009, 08:16 PM

Quote:

Originally Posted by daddysmut

if you're on the street, get the engine....it's worth it just to have the extra gear. i'd save up for a 125 tho

I agree with Lenny, go bigger in cc's like the 192 Firepower crate motor. 90 cc is not enough. Go bigger, trust me you will keep up with the traffic easier & it will be a lot more fun to ride.
tmas

firepower354 · 12-29-2009, 08:19 PM

Those P90 motors are no slouch. 49.5mm stroke, 4 speed, e22 head with a 5.25/5.5 lift cam, stock. A Wiseco CRF70 piston, and a little port cleanup makes a decent 88 class mount.

Add a 52.4mm jug & slug, or the TB 54mm for 107-114cc and a rippin "small-block".

I like 'em

The 140's are a sweet bargain, and I may be pulling a couple from new rollers next week, for a better deal yet, if you're in the market for a bigger mill.

TRT · 12-29-2009, 08:22 PM

yea what he said but uf you want a clutch then you should just get a 124cc... you can get em cheap now adays...

12-28-2009, 12:11 PM	#1 (permalink)
fastbmw 2nd Gear Member Join Date: Sep 2005 Posts: 645	Piranha engine or TB bore kit? My "beater" ZB won't run anymore (Can't seem to figure it out, but it's a 72cc big head but it was cobbled together with a mishmash of parts and I'm sick of monkeying with it) so I figured I'd throw a BBK kit at it instead of trying to ressucitate it. I know I have an e22 head and a solid bottom end so I figured I could either get a TB 88cc racehead kit TB 88cc Bore Kit for Race / e22/ CRF70 head or go for an entire 90 cc piranha Piranha 90cc Engine. Pros for TB 88; stick with Honda bottom end and lighting stator Cons; have to buy assorted bits, such as intake, throttle cable, etc. making the cost more than the Piranha. Already have a ZB with this basic kit. Pros for Piranha; I can basically drop it in (adding my 18mm carb I have sitting in the garage), plus have a 4spd semi-auto. Cons; have to swap lighting stator over to the new engine, unknown quality of the piranha. What do you guys think?

12-28-2009, 12:16 PM	#2 (permalink)
daddysmut 3rd Gear Member Join Date: Dec 2004 Location: O-town florida Posts: 3,203	Re: Piranha engine or TB bore kit? if you're on the street, get the engine....it's worth it just to have the extra gear. i'd save up for a 125 tho

12-28-2009, 11:14 PM	#3 (permalink)
AngryDirtbikers17 2nd Gear Member Join Date: Aug 2008 Location: NH Posts: 837 My Mood:	Re: Piranha engine or TB bore kit? i just got the piranha 90 for xmas..havent gotten a chance to ride it yett...soon as i rip it ill let you know how it is..seems to be awsome motor!

12-29-2009, 02:18 PM	#4 (permalink)
s_10onbagz 3rd Gear Member Join Date: Sep 2007 Location: Connecticut. Posts: 1,800	Re: Piranha engine or TB bore kit? You might have to do some work to get it up to the acceleration of a tb88rh, but it should be a nice start. Maybe a 54mm crank for a 69mm jug if it fits.

12-29-2009, 08:19 PM	#6 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 14,206 My Mood:	Re: Piranha engine or TB bore kit? Those P90 motors are no slouch. 49.5mm stroke, 4 speed, e22 head with a 5.25/5.5 lift cam, stock. A Wiseco CRF70 piston, and a little port cleanup makes a decent 88 class mount. Add a 52.4mm jug & slug, or the TB 54mm for 107-114cc and a rippin "small-block". I like 'em The 140's are a sweet bargain, and I may be pulling a couple from new rollers next week, for a better deal yet, if you're in the market for a bigger mill. __________________ Fire Power Minis, nuff said;) FirepowerMinis.com 810-237-9537 M-F 9-7 Eastern Time Zone 262-374-0706 Powder Coating Hotline Exclusive FPM parts and engines. Parts, installation and service for all makes. Honda Trail Bikes parts. Piranha & Medina bikes, thousands of parts, engines and accessories. Custom powder coating. Last edited by firepower354; 12-29-2009 at 08:24 PM.

12-29-2009, 08:22 PM	#7 (permalink)
TRT 3rd Gear Member Join Date: Nov 2005 Location: Earth Posts: 2,300 My Mood:	Re: Piranha engine or TB bore kit? yea what he said but uf you want a clutch then you should just get a 124cc... you can get em cheap now adays...

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