Honda 400ex & z400 - Need Help

[Missouri_2004_400ex 10]

Hello,

I have a 400ex with just a few add ons pipe, filter nothing done to the motor.

I want faster how do i do this? Will i blow it up? Same qeustion for my buds z400

PLEASE help us.

[marioweldinginc 10]

Depends on your mechanical skill or how much money your willing to spend. Open up your airbox, rejet the carb, cam, 440 kit, port n polish all will help. Change the front sprocket to a 14t for more low end grunt.

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[quadnut20 75]

Hello,

I have a 400ex with just a few add ons pipe, filter nothing done to the motor.

I want faster how do i do this? Will i blow it up? Same qeustion for my buds z400

PLEASE help us.

How deep are your pockets !!! The sky is the limit !!Ive seen some bad ass 400`s out here !!!

[Missouri_2004_400ex 10]

There pretty deep. But whats the best mods without giving a bigger chance for a blown up 400ex? lol

[quadnut20 75]

There pretty deep. But whats the best mods without giving a bigger chance for a blown up 400ex? lol

intake - full exhaust -cam for starters !!

[Missouri_2004_400ex 10]

i have full exhaust! And what cam with stock motor?

[marioweldinginc 10]

if its pretty deep go with a 500cc big bore kit. I did. the stroked rod bearing spins slower so in theory it wears out less and you can run 93 pump gas It will set you back 1000 for the kit. You should also add a cam, P&P, valves. Also the reverse oil flow mod with cooler helps keep the top end alot cooler. VERY important with an air cooled. Total should be with building $2400 - $2700. For less coin go with a 440 kit. I would recommend the oil cooler mod with any sort of internal work done to have that piece of mind

From what your describing is you did all the bolt ons. now you have to break open the motor.

Stock motor maybe a stage 1 from Hot Cams. remember you have to rejet your carb.

[01 RAPPY 660 12]

if money is no issue, and your mechanicy inclined, get you a crotch rocket engine and modify the chassis

[marioweldinginc 10]

Also ask CK-1999. He know quite alot about modding and racing an EX

[quadnut20 75]

i have full exhaust! And what cam with stock motor?

I would research that ! Depending on what you plan to do with it trail riding -racing - dune riding etc I`ve owned both quads you mentioned and both are fun stock ! JMO If I was gonna dump a bunch of $$$ into something it would be a 450 or a 700

[Missouri_2004_400ex 10]

I ride dunes, trails and race! I do all things! Will somone explain hotcams?

[marioweldinginc 10]

Hot Cams is the name of a company that makes quality camshafts

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[Missouri_2004_400ex 10]

What stage would be good?

[marioweldinginc 10]

For just bolt ons i would go with stage 1. If your going to go with a p&p or engine work stage 2.

Talk to a sales rep a Hot Cams before you buy they will know whats the perfect fit

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[oxidized_black 77]

saw this online ...

HOT CAMS PERFORMANCE CAM SHAFTS FAQs:

What sets Hot Cams Product, Inc. apart from other camshafts?

Convenience and engineering! Hot Cams Products, Inc. is the first camshaft company to produce its own cores from billet for the dirt bike and ATV market.

What does this imply?

This means no more core charges or having to send in camshaft for welding. A cam from billet is also much more durable and will last for longer years.

Do customers have to modify other parts to run a high-performance Hot Cam?

No. Hot Cams Products, Inc. offers high-performance camshafts that deliver maximum power and performance with a minimum of installation hassles. In some stage two and three cases there could be valve spring requirements, but this will always be noted.

Is a high-performance Hot Cam a good value when modifying an ATV’s engine?

Yes! Hot Cams Products, Inc. has been named a top product of year for its dollar per horsepower comparison. Hot Cams Products, Inc. provides drop-in performance and is the best engine modification for the money. Many times, external parts that cost far more can give far less performance gain than a high-performance Hot Cam.

Does Hot Cams only make camshafts for race models?

No. Hot Cams Products, Inc. makes cams for many play bikes and for many utility ATVs with our Mudbuster line. With a Mudbuster cam, utility 4x4 ATVs will enhance the low-end engine performance, with no top-end performance loss. Honda Rubicon, Rincon, Prairie 650 & 700, Grizzly 660, and Polaris Sportsman 700 are just some of the Mudbuster cams that are worth checking out.

Does Hot Cams Products, Inc. Camshafts really help my motors performance?

Yes, extensive development and testing is the key. Hot Cams Products, Inc. test many variations of cams for each model to ensure that the best performance and durability cam is produced.

Are there cams for sale by companies that weld cams that make better power?

Yes. Many “radical” cams will excessively wear out valve train components. Hot Cams Products, Inc. concentrates on cams that require little to no hassle while still making more power. The company would rather ride longer and give up a small amount of power.

Does the Hot Cams Products, Inc. still utilize the stock decompression mechanism?

Yes. Hot Cams Products, Inc. all come with the OEM de-comp mounts in the cam, or with the de-comp mounts and parts if the OEM is not removable.

Hot Cams is the leader in innovation, design and development of outstanding aftermarket ATV camshafts.

Hot Cams ATV Camshafts

MUDBUSTER CAMS

Hot Cams Products, Inc. makes cams for many play bikes and for many utility ATVs with our Mudbuster line. With a Mudbuster cam, utility 4x4 ATVs will enhance the low-end engine performance, with no top-end performance loss. Honda Rubicon, Rincon, Prairie 650 & 700, Grizzly 660, and Polaris Sportsman 700 are just some of the Mudbuster cams.

CAMSHAFTS STAGE 1

This camshaft boosts horsepower substantially in the mid-range and perks up throttle response. Package includes bearings, thus, utilizes the O.E.M. sprocket and auto-decompression mechanism and does not need spring change or head adjustment. Required valve modification and jetting is minimal and similar with all the other Hot Cams products, this camshaft is built out of all new billet materials. In short terms, customer nee not have to replace a core.

Description:

Single-cam motor. Excellent midrange and top-end power increase. Uses stock valve springs and rockers. *Does not use auto-decompression mechanism.

CAMSHAFTS STAGE 2

This high-performance camshaft increases horsepower considerably from mid-range to top-end and enhances over-rev. It comes complete with bearings, utilizes the O.E.M. sprocket, and requires no spring change or head modification. Required valve adjustment and jetting is minimal as well. This camshaft is made of all new billet materials. The customer does not have to exchange a thing.

Description:

Single-cam motor. More top-end power than Stage 1 with midrange gain. Uses stock valve springs and rockers. *Does not use auto-decompression mechanism.

CAMSHAFTS STAGE 3

This high-performance camshaft increases top-end horsepower and over-rev substantially over the Stage 2 and is ideal for Supermoto, desert, big-bore and stroker applications. It is available in a complete package with bearings. It utilizes the O.E.M. sprocket and does not demand any spring change or head modification. Created out of all new billet materials, it does not require valve adjustment and jetting is at minimum. Similar with other camshafts, there’s no need to alter anything.

Edited October 16, 2012 by oxidized_black

[Missouri_2004_400ex 10]

Alright so say I put cams in it and bore it out what will I see my ex improve in?

[marioweldinginc 10]

Most likely mid to upper hp improvments. You will notice more low end torque improvments with bigger pistons or longer strokes.

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