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Old 09-26-2009, 10:42 PM   #1
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Exclamation Should i buy a new os 12zt t5 or a well maintained second-hand os 12tz spec2??

Dear all


I just bought a nt1,now need for a engine for it


i need u professionals,help to decide Should i buy a new os 12zt t5 or a well maintained os 12tz spec2??

the second hand spec2 have used 8 liters oils....



Also, grp 12????


appreciate for reply
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Old 09-26-2009, 10:48 PM   #2
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Depends on how the used one was taken care of and treated.
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Old 09-26-2009, 11:44 PM   #3
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What he said. Unless I know the previous owner very well and trust him, I do not like to buy used engines. 8 liters is over 2 gallons. I would lean toward a new engine at that point unless the deal was very good and I trust the seller. Also, if you are going to be doing organized racing, a 5 port engine is probably not legal.
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Old 09-27-2009, 01:35 AM   #4
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thanks for the reply

as far as i know, just replace by one new crankcase


so ,os 12tz or grp

which one do u suggest ?
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Old 09-27-2009, 01:53 AM   #5
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only street racing


the seller can give me half price than he bought it


also this price is equal to a new not tunned os 12zt t5,that's why i ask this question


also,my friends buy a grp engine

GRP TUNNED 12 TOURING GTO1K 12TC

compare with os 12zt t5 which one is faster???


i want one faster than his

Last edited by kakluote; 09-27-2009 at 06:38 AM.
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Old 09-27-2009, 07:09 AM   #6
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Well I my self would look at getting parts. The os tz you can get parts for, where the grp parts are getting hard to find since they do not make them any more.
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Old 09-27-2009, 07:54 AM   #7
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so which on is faster?
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Old 09-27-2009, 09:57 AM   #8
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Quote:
Originally Posted by kakluote View Post
only street racing


the seller can give me half price than he bought it


also this price is equal to a new not tunned os 12zt t5,that's why i ask this question


also,my friends buy a grp engine

GRP TUNNED 12 TOURING GTO1K 12TC

compare with os 12zt t5 which one is faster???


i want one faster than his
i would stay away from GRP...
their engines are now on sale but the parts support may not be good. we all know what happened to the company.

i have a BOSS engine which is made by GRP, and i've had difficulty finding their rods and bearings at the LHS's.
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Old 09-28-2009, 06:15 AM   #9
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Quote:
Originally Posted by kakluote View Post
Dear all


I just bought a nt1,now need for a engine for it


i need u professionals,help to decide Should i buy a new os 12zt t5 or a well maintained os 12tz spec2??

the second hand spec2 have used 8 liters oils....



Also, grp 12????


appreciate for reply
owned all 3 of those engines, my verdict would be:

GRP MR tuned= very linear powerband and fuel economy is about the same with picco. high RPM seems unlimited. u can buy replacement parts abroad and some times as far as Hong Kong.

Ostz 5ports= fuel barely 5mins, power better than the grp.

ostz speed2 magnesium head=fuel barely 5mins, power way better than those two bottom. and it screams with SAGE/t1040 pipe..
a
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Old 10-13-2009, 11:03 AM   #10
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thanks all of u


I have bought a new os 12tz spec2
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