12:1 Piston Kit Steet worthy?

[Anonymous]

I purchased a wiseco 12:1 piston kit 747cm(stock bore) for a 16v GS750 off Ebay.
I'd like to try it in my 83 GS750SD. Clock has 34,000 miles on it. Will I need any additional work done for this modification? Gas at the pump OK?
It's all new to me, need all the help I can get. Thanx

[lhanscom]

I think you'll have problems running pump gas. You may get away with 11:1 but I don't think 12:1 will work without retarding the ignition. If you set it up so that you can retard your ignition for normal riding you could advance it again when you get some good gas.

[Anonymous]

12;1

Not worth it , you will be having to buy gas from a performance shop, that sells Moroso fuel to run that with any kind of decent advance curve, you will have to keep the head torqued all the time you should fresh'in up the valves, and if you do ANY type of traffic driving you will have to have a oil cooler, to keep from over heating, and increase of that much compression is goung to make the engine run that much hotter, and stress the lower end that much more, and even with stock cams I would check the piston to valve clearence, cause we don't have a clue weather these are custom slugs ment to be valve reliefed fly cut, for a special application, I would check with wiesco if you have the boxes with #'s

[Anonymous]

You may be able to reduce the compression 1/2 point or so by running a thicker cylinder base gasket.

[Anonymous]

12:1 Piston Kit Street Worthy?

Thanks for the feedback guys. Looks like this kit is going to sit on the shelf for a while.

[SqDancerLynn1]

If you know a good machinest it would be possible to mill .050 off the tops??? Send & email to Wiseco & ask if the domes are thick enough? they should be!