Motor Overhaul (summer project)

[RamAir]

Hello all! :biggrin:

This is mainly to improve the preformance of the bike but I am also doing cometic upgrades as well. But for this post I will be listing all the upgrades with links that I plan on doing to make the GZ 250 more powerful and better overall to ride. I am looking for better WHP AND better MPH. I know not easy but hear me out on this! So, everyone lets begin strap your selves in boys and girls this is gonna be a hella project and a big dream until I start wrenching in summer. HERE WE GO! :cool:

First things first! Theres no replacement for displacement Soooo
BIG BORE KIT!
http://cgi.ebay.co.uk/GN300-GN250-BIG-B ... 0462854879

Need to knows for me, how sure are we that this will just bolt up and work??
Improvemnets on this I will be getting total seal piston rings for the best power and MPG!

Next, CR I would need to do far more research on this but I would like to use the piston rod outta a 1983 Honda VT500. It beeing a V-twin that means it have TWO 250cc banks. Sooo thats like two gzmotors the bore and storke are just about the same but its CR is 10.5:1 so if that rod has the same bores on both sides I can use it and see if it bumps up our CR to give use more power. The V-star 250 is 10:1 and makes more power and is faster then the GZ and uses 87 octain so I am thinking with the right tune and set-up 10.5:1 will not be that bad! Now I know that piston head and cumbuction chamber also play a BIG part in this so I will be looking into it more like I said. Here is this like.
http://cgi.ebay.co.uk/GN300-GN250-BIG-B ... 0462854879

Here is a list of the honda specs.
http://www.motorbikes.be/en/Honda_VT_50 ... _1984.aspx

And the GZ specs just compair for yourself.

http://www.mbike.com/suzuki/gz250/2009

Or even looking into piston options from 600CC bikes with the same rod to see if we could get a higher comp piston head.

Also this cought my eye. Anyone know what this is about?? The new 125GZ's are fuel injected??

http://www.bikez.com/motorcycles/suzuki ... 5_2010.php

Really? :retard:

Also I wanna do the oil cooler idea.

viewtopic.php?f=9&t=3943

And I wanna do up a ramair intake system and heat wrap the exhaust pipes and get a new exhaust system



More for looks and personally I think it would sound better once its a 300cc bike :drool:

And I will also be doing what this member did with the PP and new parts. Pretty much I will be ripping off all the work he did. And if he is still on here that would be great if he can give me some pointers or on how much better the bike was after all of his work.

Here is the link.

viewtopic.php?f=9&t=3050

And a gas tank mod and all that but thats another thread.

So to sum this up I wanna do the
Big Bore Kit.
Total seal rings.
Port and Polish.
Cold air Ram air intake system. Custom done by me.
Exhaust system. To over all help flow and help the bigger motor breath better. Same deal with the P&P.


aND i AM HOPPING THAT AFTER ALL THIS i CAN DO THE 16TOOTH MOD OR PLAY AROUND WITH THE REAR GEAR AND GET A TALLER RATIO OVER ALL AND STILL HAVE THE SAME PREFORMANCE AS BEFORE WHEN IT WAS JUST A 250CC BIKE BUT OVER ALL BETTER HIGHWAY POWER AND BETTER mpg SINCE i PLAN ON RUNNING A TALLER FINAL DRIVE RATIO GEAR!

:popcorn: :popcorn: :popcorn:

Any and all edvise and information and input will be most welcome! Sorry if there are any weird mistakes my computer screen is acting up and I cannot fully reveiw what I have typed.

Thanks again guys! :2tup: