Planet Minis

mini mullisha · 07-12-2008, 04:53 AM

Im a little confused?Do crf bore kits work on a z50r 85model?As ive seen kits for z50s that fit xr/crfs's ?

crf450 racer · 07-12-2008, 05:04 AM

Yes same motor

mini mullisha · 07-12-2008, 05:31 AM

cause thinking of going halfs in this kit;
Five-O 88cc Engine Kit - BTO Sports
with mate,he wants cam and carbie/maifold for his stock50 as ive allready got an manifold and 18mill carb to put on the z50r, so this will work?

crf450 racer · 07-12-2008, 05:38 AM

yea

mini mullisha · 07-12-2008, 11:46 PM

Quote:

Originally Posted by crf450 racer

yea

Thanks heaps buddy,but can som1 else also comfirm this for me,cause my mrs will kill me if i buy more stuff that dont fit my bikes haha

alexficco · 07-12-2008, 11:51 PM

i dont think so... not untill the 88 model... im not for sure tho. pm firepower354 and he could tell you

SLAyER · 07-13-2008, 12:17 AM

1982 and up is the same.

mini mullisha · 07-13-2008, 01:05 AM

Quote:

Originally Posted by SLAyER

1982 and up is the same.

Yer thats what i thought, but when the say 6 or 12 volt that losses me.
Yeiw SLAYER!!

chuggz · 07-13-2008, 04:54 AM

mini, if your motor is 6volt with points, with 3 down gearbox you will need a different piston and barrel as the 6v conrod is shorter,

if your motor is 12volt with cdi 3up gear box than the kit will work BUT the cam will be different, z50 cams are not roller bearing

dirtbkr188 · 07-13-2008, 06:52 AM

As SLAyER stated above, the '82 and newer engines have the long rod, and the CRF big bore kit will fit...BUT...as chuggz said, the bearing cam will NOT work in the Z50R head, and there is a loss of compression due to the bigger combustion chamber area of the Z50R head.

T Bolt USA · 07-13-2008, 07:33 AM

no matter what year honda 50 you have we have a bbk

chuggz · 07-13-2008, 02:16 PM

i have a 1982 z50 motor 3 down and points also, and i purchased a 88cc hyper stage kit for it and the piston didnt come right to the end of the barrel because of the shorter rod,meaning i didnt have much compresion, luckily i bought a second hand crf50 motor that solved my issue

BlackBeard · 07-13-2008, 02:17 PM

your 85 motor is fine. it will bolt right up. just make sure he takes the cam as i think your z50 head uses journal type bearings instead of bearings like the crf

chuggz · 07-13-2008, 02:29 PM

honda partsmanual fiche z50r 85 z50 monkey gorilla

look here this bike is obviously 6 volt and the crf kit will not work they have a flatt top piston, you will need a different piston for the big bore kit to work on this motor to compensate for the shorter rod

dirtbkr188 · 07-13-2008, 05:08 PM

The 1982 and newer crank rod is the same length, whether or not it is in a Z50R, an XR50, or a CRF50. Being 6V or 12V has nothing to do with it. The only time 6V or 12V comes into play is when you are swapping complete crank assemblies. The 6V has a different left-side taper than the 12V cranks, and is 3/8" shorter on the stator side.
Also, the '93 (I think) and newer Z50R has the same roller bearing cam as the XR/CRF50s have.

mini mullisha · 07-13-2008, 05:31 PM

Far out im still confused haha,Thanks heaps for replys.I think i might just get the tb88 kit thats meant for my year bike and be safe,bike only cost me a few hunge so not after anything flash,id be spewing if it went better than my crf88 lol.
Cheers

BlackBeard · 07-13-2008, 06:00 PM

what were basically saying is get that five o kit and as long as you only keep the piston and cylinder youll be fine, the cam wont work for you. if i were you id check out DrATV OPERATES HERE and get there 99 dollar 88kit

dirtbkr188 · 07-13-2008, 06:03 PM

The TB88 kit for your bike will have a piston domed specifically to work with your stock head if you order this kit.
And, apparently, the same piston will work with the race head, as well, as shown here.

mini mullisha · 07-13-2008, 06:26 PM

yer the tbkit is the 1 i was looking at,dratv not sure they post to aus,and can get the tb kit in aus reasonably cheep.

07-12-2008, 04:53 AM	#1 (permalink)
mini mullisha 2nd Gear Member Join Date: Dec 2005 Location: QLD Australia Posts: 255 My Mood:	Bore kits Im a little confused?Do crf bore kits work on a z50r 85model?As ive seen kits for z50s that fit xr/crfs's ?

07-12-2008, 05:04 AM	#2 (permalink)
crf450 racer 1st Gear Member Join Date: Jun 2008 Location: TEXAS Posts: 169	Re: Bore kits Yes same motor

07-12-2008, 05:31 AM	#3 (permalink)
mini mullisha 2nd Gear Member Join Date: Dec 2005 Location: QLD Australia Posts: 255 My Mood:	Re: Bore kits cause thinking of going halfs in this kit; Five-O 88cc Engine Kit - BTO Sports with mate,he wants cam and carbie/maifold for his stock50 as ive allready got an manifold and 18mill carb to put on the z50r, so this will work?

07-12-2008, 05:38 AM	#4 (permalink)
crf450 racer 1st Gear Member Join Date: Jun 2008 Location: TEXAS Posts: 169	Re: Bore kits yea

07-12-2008, 11:51 PM	#6 (permalink)
alexficco 3rd Gear Member Join Date: Dec 2006 Location: Gardnerville, NV Posts: 1,277	Re: Bore kits i dont think so... not untill the 88 model... im not for sure tho. pm firepower354 and he could tell you

07-13-2008, 12:17 AM	#7 (permalink)
SLAyER 2nd Gear Member Join Date: Apr 2004 Location: Camarillo, CA Posts: 984 My Mood:	Re: Bore kits 1982 and up is the same.

07-13-2008, 04:54 AM	#9 (permalink)
chuggz PM Newbie Join Date: Jun 2008 Posts: 4	Re: Bore kits mini, if your motor is 6volt with points, with 3 down gearbox you will need a different piston and barrel as the 6v conrod is shorter, if your motor is 12volt with cdi 3up gear box than the kit will work BUT the cam will be different, z50 cams are not roller bearing

07-13-2008, 06:52 AM	#10 (permalink)
dirtbkr188 3rd Gear Member Join Date: May 2004 Location: New Jersey Posts: 2,973	Re: Bore kits As SLAyER stated above, the '82 and newer engines have the long rod, and the CRF big bore kit will fit...BUT...as chuggz said, the bearing cam will NOT work in the Z50R head, and there is a loss of compression due to the bigger combustion chamber area of the Z50R head.

07-13-2008, 07:33 AM	#11 (permalink)
T Bolt USA Advertiser Join Date: Jan 2005 Posts: 4,793 My Mood:	Re: Bore kits no matter what year honda 50 you have we have a bbk __________________ T Bolt USA ALL top Pitbikes ,Engines and Parts for Pitbikes & Minis Website Contact THECRKID@TBOLTUSA.COM or Call 215-630-3554

07-13-2008, 02:16 PM	#12 (permalink)
chuggz PM Newbie Join Date: Jun 2008 Posts: 4	Re: Bore kits i have a 1982 z50 motor 3 down and points also, and i purchased a 88cc hyper stage kit for it and the piston didnt come right to the end of the barrel because of the shorter rod,meaning i didnt have much compresion, luckily i bought a second hand crf50 motor that solved my issue

07-13-2008, 02:17 PM	#13 (permalink)
BlackBeard "ZBBT" Join Date: Oct 2007 Location: 50 riders Posts: 1,836 My Mood:	Re: Bore kits your 85 motor is fine. it will bolt right up. just make sure he takes the cam as i think your z50 head uses journal type bearings instead of bearings like the crf

07-13-2008, 02:29 PM	#14 (permalink)
chuggz PM Newbie Join Date: Jun 2008 Posts: 4	Re: Bore kits honda partsmanual fiche z50r 85 z50 monkey gorilla look here this bike is obviously 6 volt and the crf kit will not work they have a flatt top piston, you will need a different piston for the big bore kit to work on this motor to compensate for the shorter rod

07-13-2008, 05:08 PM	#15 (permalink)
dirtbkr188 3rd Gear Member Join Date: May 2004 Location: New Jersey Posts: 2,973	Re: Bore kits The 1982 and newer crank rod is the same length, whether or not it is in a Z50R, an XR50, or a CRF50. Being 6V or 12V has nothing to do with it. The only time 6V or 12V comes into play is when you are swapping complete crank assemblies. The 6V has a different left-side taper than the 12V cranks, and is 3/8" shorter on the stator side. Also, the '93 (I think) and newer Z50R has the same roller bearing cam as the XR/CRF50s have.

07-13-2008, 05:31 PM	#16 (permalink)
mini mullisha 2nd Gear Member Join Date: Dec 2005 Location: QLD Australia Posts: 255 My Mood:	Re: Bore kits Far out im still confused haha,Thanks heaps for replys.I think i might just get the tb88 kit thats meant for my year bike and be safe,bike only cost me a few hunge so not after anything flash,id be spewing if it went better than my crf88 lol. Cheers

07-13-2008, 06:00 PM	#17 (permalink)
BlackBeard "ZBBT" Join Date: Oct 2007 Location: 50 riders Posts: 1,836 My Mood:	Re: Bore kits what were basically saying is get that five o kit and as long as you only keep the piston and cylinder youll be fine, the cam wont work for you. if i were you id check out DrATV OPERATES HERE and get there 99 dollar 88kit

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07-13-2008, 06:03 PM	#18 (permalink)
dirtbkr188 3rd Gear Member Join Date: May 2004 Location: New Jersey Posts: 2,973	Re: Bore kits The TB88 kit for your bike will have a piston domed specifically to work with your stock head if you order this kit. And, apparently, the same piston will work with the race head, as well, as shown here.

07-13-2008, 06:26 PM	#19 (permalink)
mini mullisha 2nd Gear Member Join Date: Dec 2005 Location: QLD Australia Posts: 255 My Mood:	Re: Bore kits yer the tbkit is the 1 i was looking at,dratv not sure they post to aus,and can get the tb kit in aus reasonably cheep.