Are bigger carbs better?

[schrodingers cat]

Im not on the track. How do you know I cant find more?

Just because you can doesn't mean you should.

The fact that you are HERE asking the questions tells me your knowledge base is too small to start with.
By all means spend the money as an investment is your own learning.
If you want more power the shortest path is a more cc.

[nzspokes]

Just because you can doesn't mean you should.

The fact that you are HERE asking the questions tells me your knowledge base is too small to start with.
By all means spend the money as an investment is your own learning.
If you want more power the shortest path is a more cc.

Tuff crowd.

Thought was a motorcycle website, not a granny one.

[ktm84mxc]

A man always needs more power it's his God given rite, there's a easy route or the less traveled harder route by tinkering\modifying the bike.
The main handicap with the GPZ400 is the bike runs all the fitments of the 600 with 33% less motor it will always be a struggle to get to perform up to a late model RVF\CBR\ZXR\FZR 400 spec.
It could be done at a cost of time and money , just think you're Bert Munro beavering away in your shed paying homage to the "Gods of Speed" .

[schrodingers cat]

Tuff crowd.

Thought was a motorcycle website, not a granny one.

I get it now. Its a quiz.

You ask the question and we supply the answer you want to hear

[nzspokes]

A man always needs more power it's his God given rite, there's a easy route or the less traveled harder route by tinkering\modifying the bike.
The main handicap with the GPZ400 is the bike runs all the fitments of the 600 with 33% less motor it will always be a struggle to get to perform up to a late model RVF\CBR\ZXR\FZR 400 spec.
It could be done at a cost of time and money , just think you're Bert Munro beavering away in your shed paying homage to the "Gods of Speed" .

You get it. The 400 is quite a bit lighter than the 600 as it has and alloy frame over a steel one etc.

I have been known to spend all night porting motors......

[bogan]

Does that mean the 400 internals are all over-engineered? There's only one thing to do with over-engineered internals...

[nzspokes]

Does that mean the 400 internals are all over-engineered? There's only one thing to do with over-engineered internals...

Took me a while to get what you meant, just saw the car in the background.

gotta love over engineering.

[GrayWolf]

Just mucking about looking at the spec of my GPZ400 and the same year 600. The 400 has 30mm carbs and the 600 has 32mm. Jet sizes etc are pretty much the same, even use the same needles.

So would running 32mm carbs on my 400 give me more power? Or will it kill an torque I have?

probably one of the best 'parts bin specials' that answers the question was Kawasaki's own ZL1000 eliminator from the 1980's. It was Kwak's 'answer' to the V-max, Madura, and Magna 'Power cruisers'. Apart from the frame the bike was a part bin special....GTR1000 shaft drive bottom end (beefed up shaft) GPZ900 close ratio 6 speed box, ZX10 top end, but GPZ 900 head (valves) and GPZ900 carbs (both smaller than the ZX10 ones)... The cam? I guess could only be described as the GTR cam with GPZ lift. I owned one of these and they were quicker to 50mph than the V-max, (we are talking fraction of seconds). All those bike produced almost as much torque as a sprot bike at full power, at almost 1/3 of the rpm. Then literally doubled torque every 3000rpm and BHP was almost a 45 degree climb regards to revs. At only 110bhp (sprot bikes were about 125-130bhp then) the bike would pull in top gear from 1500rpm with gentle throttle in top. The smaller carbs will give you better low/mid range power, the bigger carbs if everything else is 'right' will give more fuel/air at higher RPM.
At the end of the day, they old saying is true,, no substitute for 'cubes'

[nzspokes]

probably one of the best 'parts bin specials' that answers the question was Kawasaki's own ZL1000 eliminator from the 1980's. It was Kwak's 'answer' to the V-max, Madura, and Magna 'Power cruisers'. Apart from the frame the bike was a part bin special....GTR1000 shaft drive bottom end (beefed up shaft) GPZ900 close ratio 6 speed box, ZX10 top end, but GPZ 900 head (valves) and GPZ900 carbs (both smaller than the ZX10 ones)... The cam? I guess could only be described as the GTR cam with GPZ lift. I owned one of these and they were quicker to 50mph than the V-max, (we are talking fraction of seconds). All those bike produced almost as much torque as a sprot bike at full power, at almost 1/3 of the rpm. Then literally doubled torque every 3000rpm and BHP was almost a 45 degree climb regards to revs. At only 110bhp (sprot bikes were about 125-130bhp then) the bike would pull in top gear from 1500rpm with gentle throttle in top. The smaller carbs will give you better low/mid range power, the bigger carbs if everything else is 'right' will give more fuel/air at higher RPM.
At the end of the day, they old saying is true,, no substitute for 'cubes'

I agree, "theres no replacement for cubic displacement"

Im lookin at pulling the trigger on a Bandit next week anyway. Its only 800cc bigger.....

[FJRider]

I agree, "theres no replacement for cubic displacement"

Im lookin at pulling the trigger on a Bandit next week anyway. Its only 800cc bigger.....

In the tight and twisty's ... the 400 will still be quicker ...

Having the power is good ... but you need to be able to use it. Skill to use it to the best advantage comes later.

[bsasuper]

No problem asmokies

[DEATH_INC.]

Just do it. ANYTHING can be made to make more power. And more is better. Bigger carbs, bigger cams, better exhaust, a bit (or a lot) of grinding in the ports and chambers, and a bit more compression. Get into it!
No harm in spending a bit of time and money making what you've got go better.
Any idiot with a cheque book can buy something faster but where's the fun in that.

[GrayWolf]

Just do it. ANYTHING can be made to make more power. And more is better. Bigger carbs, bigger cams, better exhaust, a bit (or a lot) of grinding in the ports and chambers, and a bit more compression. Get into it!
No harm in spending a bit of time and money making what you've got go better.
Any idiot with a cheque book can buy something faster but where's the fun in that.

If the bike was a 'keeper' apart from the power? Maybe that would be an option. But at the end of the day you spend $X000 on tuning bits for a bike that wont be worth the extra $X000 at the end of the exercise, has had its reliability and longevity possibly compromised by the level of tune, only to still be out performed by a bigger bike that would have likely only cost the $X000 to begin with.

[ducatilover]

In the tight and twisty's ... the 400 will still be quicker ...

Having the power is good ... but you need to be able to use it. Skill to use it to the best advantage comes later.

The GPZ isn't exactly a wonderful handling bike anyway...

Just do it. ANYTHING can be made to make more power. And more is better. Bigger carbs, bigger cams, better exhaust, a bit (or a lot) of grinding in the ports and chambers, and a bit more compression. Get into it!
No harm in spending a bit of time and money making what you've got go better.
Any idiot with a cheque book can buy something faster but where's the fun in that.

This guy rules.

[ducatilover]

If the bike was a 'keeper' apart from the power? Maybe that would be an option. But at the end of the day you spend $X000 on tuning bits for a bike that wont be worth the extra $X000 at the end of the exercise, has had its reliability and longevity possibly compromised by the level of tune, only to still be out performed by a bigger bike that would have likely only cost the $X000 to begin with.

All I can say is, if we all followed that logic we'd e riding ZZR1400s.
Who gives a turtles flipper if something is faster and cheaper? When modifying anything logic and economics is thrown out the window
Should I have not built my bike? I could've got a much "better" bike for the same money.