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Junior Mint
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 Post subject: Re: need 4 valve piston
PostPosted: Thu Apr 14, 2016 7:20 am 
yes the 2 valves stock is faster but the 4 valves have more potential.

There is a copy/paste from some things i found in another forum.

Quote:
The advantage of 4 valve with the bigger volume ports over the 2 valve setup. It is a straight bolt on with the 2 valve version, the camshaft is shorter and the lobes are closer together in order to leave room for the spark to be closer to the center of the combustion chamber, both the intake and the exhaust ports are identical to the 2 valve head, so are the position for the cam centerline and the drive for the water pump is also the same for both heads, the head gasket is the same, the head hight and is also the same so the ARP bolts will work, the valve cover is different.

It seems like the springs and retainers are the same on both heads, the size of the valves is the same with the head size being the only diference, so installing 2 valve springs on 4 valve heads wil take care of the stiffer springs problem. The intake rocker arm is way offset, so the risk of bending at high rpm is very high, the reason for the roller rocker arms is that that motor has a very wild cam. The middle range on the European zoomer must be insane, however the rpms are limited to under 10k if it is to be run safely in the street, any bending on the arms will allow the shim to fall creating a nasty problem at that hi rpm

The spark plug will not fit the 4 valve head, it does require a specific design in order to fit in such tight place. Also the European head uses a temperature sensor instead of a switch in the 2 valves, so the hole in the side of the head is of different size, the difference between a sensor and a switch is that the sensor will give the ECM (computer) a real time temperature of the coolant so the FI can be adjusted to suit, the 2 valves version just uses a switch, so does nothing until the coolant reaches a certain temp and then it jump and tell the ECM to turn on the over-temp light on the gauge and limit the rpms in order to protect the engine. The water pump location is the same and the flanges identical

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Junior Mint
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 Post subject: Re: need 4 valve piston
PostPosted: Mon Apr 18, 2016 6:46 pm 
Hi,

I still looking for my 4 valve piston. Someone can have these measures for the 2v BB piston please?

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Rusty Trombonner
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 Post subject: Re: need 4 valve piston
PostPosted: Mon Apr 18, 2016 7:00 pm 
Jcracing on here knows the BB maybe pm him and he can maybe hook you up with the measurement

So odd but do you need the 4 v just cause it fi or can you go 2v with fi at all? Cause I'd love to be fi

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Junior Mint
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 Post subject: Re: need 4 valve piston
PostPosted: Mon Apr 18, 2016 7:19 pm 
hey ogmofo :)

Thanks i will pm him.

Yes i would like to keep my FI 4v engine, but i would like to be BB too :P

If you want to be FI in 2v i think in mecanichs all is possible, all depends on your resources and knowledge :wink: .

Edit: i dont find any JCRacing member, do you have his link please?

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Rusty Trombonner
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 Post subject: Re: need 4 valve piston
PostPosted: Mon Apr 18, 2016 7:51 pm 
viewforum.php?f=108

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Junior Mint
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 Post subject: Re: need 4 valve piston
PostPosted: Mon Apr 18, 2016 8:00 pm 
ogmofo wrote:
So odd but do you need the 4 v just cause it fi or can you go 2v with fi at all? Cause I'd love to be fi


The Honda's Injection System is called Programmed Fuel Injection or PGM-Fi

http://world.honda.com/motorcycle-technology/pgm-fi/index.html

http://montesa4rt.nl/data/information_honda-pgmfi.pdf

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Rusty Trombonner
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 Post subject: Re: need 4 valve piston
PostPosted: Mon Apr 18, 2016 8:02 pm 
That's gonna take me some study. Thank you for this.

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Junior Mint
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 Post subject: Re: need 4 valve piston
PostPosted: Mon Apr 18, 2016 8:17 pm 
thanks to you bro ;)

fo your FI i think you would need to find the injector, te euopean ECU and mybe something like this: http://www.useasydocs.com/index.html#
or this: http://japan.webike.net/products/1919261.html

EDIT: http://asia.vtec.net/beystock/hondata/

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Junior Mint
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 Post subject: Re: need 4 valve piston
PostPosted: Tue Apr 19, 2016 3:31 am 
ok so i asked to JCRacing but he doesn't pistons, so i still looking for someone who could give me the measures of a BB piston... :meh:

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n00bie


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 Post subject: Re: need 4 valve piston
PostPosted: Mon Jul 11, 2016 9:09 am 
Hi Manito,

I am also looking for a 4 valve BB piston, or oversized. I also tried JC Racing but he does not make those 4 valve pistons. Anybody else?

I have oil leakage to the engine, replacing the rings will not solve the problem. It's around 40ml / 100km (yeah i know, it is not negligible) but before I buy a new stock piston and cylinder I would try to replace the stock piston. My engine has 39000km 'milage' so it is highly used, not a big surpise.

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