1200 piston questions

[Ionized_Gas]

Starting to pile everything up for a turbo build on my mk1 bandit. I have a spare mk2 engine that I plan on building for the task of around 200hp. I found MTC pistons, after an email they directed me to the gsxr1100 pistons. Are these any better than just getting a set of used hayabusa pistons? Looking at the 81mm x 59 "turbo" pistons the comp is stated to be around 10:1, with them being for a 1100 is that number accurate seeing how they'll be in a 1200? Any issues with fitment as they're not specifically for a 1200?

Little in the dark on this one as I'm used to buying pistons off the shelf and not sourcing from different engines.

Thanks

[Gixer1460]

MTC have been supplying turbo pistons since forever! Many installs have been completed and championships won with MTC equipment. Personally I'd use the 80mm / 1186cc kit - easier to bore, leaves more metal in the liner and you've an overbore left if it goes 'pete tong' 10:1 CR may be considered a bit high but for 200hp you won't be using a lot of boost and a 1mm decomp plate is an easy fix if lower required for more boost later! Pretty sure this kit started out as made for the GSX1100 as about the ONLY off the shelf turbo pistons back in the day!

Busa pistons are the cheap route but are a one shot deal - break a piston or rings and could be new barrels + rebore ! I usually plan on doing something once and spending to achieve that is ok - for me!

[Ionized_Gas]

I agree, I tend to like to over build the engine because I'll most likely want to turn it up or go bigger and if the engine is already setup for it, it's one less step/cost. 

I've looked at the rods as well, to avoid using a decomp plate. If rod length is 117mm, is there any issue with a shorter rod say 116 or 116.5? Only thing I could think of would be piston getting too low on the cyl wall and availability.

[Fredrik_Steen]

I have those mtc pistons in my bandit engine, don't forget to gap the rings.

 

My friend did 450hp with a stock hayabusa engine on pump fuel a couple of weeks ago. (Stock 12+ compression)

Busa pistons are strong!

[Gixer1460]

Again this is my preference, I prefer to (if possible) deck the pistons to as close to the top of the barrels and use a head gasket that will give 0.035 - 0.040" / about 1mm max squish. A good squish band will assist in supressing detonation and improve power for lower boost. The MTC piston crown's are quite thick so combustion bowl can be enlarged to tailor the CR required - another bonus.