Kawasaki KFX450 Forum - KFX450Central banner
1 - 5 of 5 Posts

·
Registered
Joined
·
120 Posts
Discussion Starter · #1 ·
Lately I've been looking into this. I went ahead and dropped the head out since everything has to be taken off anyway to be frame swapped and have been trying to see what can be done for power. Porting is a definate must. After inspecting the head best that can be w/out splitting it, I believe a huge increase could be made there pretty easily. Much more so than an exhaust. Cams are a must too. Especially exhaust and intake if ported.

Somebody else may have already noticed this but if you compare correct aerodynamic to the "pockets" on the head you'll notice that the design actually is restricting airflow due to the difference in velocity of the flow, especially out the exhaust chamber. I'm not sure what could be done to fix this other than trying to shave off excess material.

Secondly is an idea I've been throwing around since I first saw how the KFX's intake and EFI setup was done. I used it in comparison to a Dale's and some of the great ideas the R&D guys on those sites have made for them that I think will benefit a KFX quite alot. It's deriven from a past idea and modified for this application. I can't get started on it until next week though due to frameswap and that I can't take the quad back home until the dealer reassembles in full and has running to test it. Then it'll come back and apart to work on these projects. I've stayed away from actually doing many projects and instead learned from some great people, studied every manual/book I could find, and talked w/machinests, engine builders, etc. I have done basic work on some machines and given a few successful shots at porting recently and want to see what can be done to wake up a KFX. In the coming weeks I hope to have dyno graphs up w/the increase over stock and whether it works or not. Until then we'll see what the pro builders come up with as I believe this quad has enormous power potential after seeing the stock head/intake setup.

Lets just say the secret is something that I'm sure others have thought of or are already working on. We'll see what happens. If it doesn't work then I'll flatout say it. But if the dyno shows a good increase then it'll be a go. Nothing will be claimed until I have a dyno graph to prove/deny the hopes.
 

·
Registered
Joined
·
184 Posts
After talking with a few individuals, this quad is extremely restricted unfortunately. The Intake and exhaust are the first things to go. The Head, while I have not opened it up myself, is said to be extremely restricted as you state.

We are currently working on some intake ideas to fill an immediate solution, but the long term solution will be even better!!

As soon as we get the intake settled, we will start work on the head. Just takes time and money!

The unfortunate thing is that the quad is so restricted stock, it sucks to have to dive so far into the motor to get results..... Oh well!

PDR
 

·
Registered
Joined
·
120 Posts
Discussion Starter · #3 ·
Exactly. I like the stock feel but after seeing what's inside I was quite amazed. They had to have done it for emissions and saftely but wow. I wouldn't doubt a 5+hp gain in basic porting/tuning alone on these things. Let alone cams. Would also like to see a different valve/spring setup.

Will have pictures hopefully in the coming weeks as far as progress and stock vs what I'm working on. Sadly finances won't be enough to go after the valve/spring idea just yet. Somebody else I'm sure will get to it though. One major problem is the intake area though. Flatout horrid to the power.
 

·
Registered
Joined
·
120 Posts
Discussion Starter · #4 ·
The clock is counting down. Hold-up's on the frame swap and now the gas tank has set me back several weeks. Still waiting on new gas tank so that I can get to work but the intake system I've designed will be under fabrication this week and the head porting/improvements will be coming shortly after that. Hopefully w/in the next 2-3 weeks I will have some dyno runs and finished products.
 
1 - 5 of 5 Posts
Top