What are the Pros and Cons of a BBK?

Carnie · Post by **Carnie** » Thu Mar 17, 2011 11:20 pm

I am wanting to put a 48mm BBK in my '87. But I want to know if there are any negative side effects of doing so. Also, do I need to get anything else to go along with it, like gears or anything? If so, where would be a good place to find those parts?

THANKS!!!

____________
black 87 spree

veedubh20 · Post by **veedubh20** » Sat Mar 19, 2011 4:07 am

dont waste time on 87 -93 motor.

get a dio motor and be happy!

Bear45-70 · Post by **Bear45-70** » Sat Mar 19, 2011 11:53 am

Carnie wrote:I am wanting to put a 48mm BBK in my '87. But I want to know if there are any negative side effects of doing so. Also, do I need to get anything else to go along with it, like gears or anything? If so, where would be a good place to find those parts?

THANKS!!!

____________
black 87 spree

Pro:

More power

Better performance

Con:

Cost money to buy

Takes work to install

Reduced fuel economy

Reduced engine reliability

Needs aftermarket intake system to get the most out of it

Needs aftermarket exhaust system to get the most out of it

Oh and skip the Dio unless you have lots of money and better than average mechanical skills.

mr pibbs · Post by **mr pibbs** » Sat Mar 19, 2011 12:15 pm

It may seem strange ( or it may not) but these gentlemen are correct. If you are looking for dependable speed get an engine from a 94+ elite and you will be happier and probably spend less money on jets/carbs/kit etc.

I suggest swapping a Kymco ZX 50 in. Larger 12" rim, wide tire - great speed.

bakaracer · Post by **bakaracer** » Sat Mar 19, 2011 1:14 pm

You will also need to get the head opened up for the largerbore size and have the head recut for a squish band for that size bore. You are limited bylowed and top speed as the spree is a non-variated motor. If you put up gears ,you loose some lowend takeoff.if you keep the stock gears your topspeed will be about the same maybe another 2-3mph more but that's it. At least you will get to your topspeed faster and have more torque to climb hills. That's the plus side of adding a bigger bore

Bear45-70 · Post by **Bear45-70** » Sat Mar 19, 2011 1:26 pm

Read here about the head work with pictures.

http://hondaspree.net/wiki/index.php5?t ... ds_-_Spree

eliteguy50 · Post by **eliteguy50** » Mon Mar 28, 2011 7:16 pm

Another con is that a BBK requires more oil than the stock delivery system supplies so on the road fill ups are not as simple with pre-mix.

Carnie · Post by **Carnie** » Mon Mar 28, 2011 11:10 pm

Do you have to pre-mix once you put in a BBK or will oil injector suffice and do that for you?

Trafficjamz · Post by **Trafficjamz** » Mon Mar 28, 2011 11:19 pm

Carnie wrote:Do you have to pre-mix once you put in a BBK or will oil injector suffice and do that for you?

You can add oil to the tank @ a ratio of 70:1

or

disable the oil pump and mix @ 32:1

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What are the Pros and Cons of a BBK?

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