AKheathen Posted June 4, 2009 Report Share Posted June 4, 2009 Everytime you hear this question asked you never get a straight answer. So about a week ago me and my friend decided to try this theory out. We decided in order to be able to tell the difference we would have to make a huge spacer and then run no spacer. We agreed that a 1" thick spacer should do the trick. Then we had to decide what we would test it on. I convinced him that we should use his 1985 Yamaha 330cc tri-z because since it has only one cylinder that it would be easier to notice the difference between the two spacers. So I machined the spacer for his tri-z and we bolted it on. We ran it with the spacer and then took it off and ran it with no spacer. After a few pulls each way it was very evident that with the spacer it had ALOT more bottom end but it wouldn't rev out the same way it did without the spacer. did youj install it on the carb side? Quote Link to comment Share on other sites More sharing options...
shanYE west Posted June 4, 2009 Report Share Posted June 4, 2009 Never noticed changes on my 421 cub.. Went from no spacers to a 1/2" spacer (to lift my bowls off the cases). Quote Link to comment Share on other sites More sharing options...
BoostedRex Posted June 4, 2009 Report Share Posted June 4, 2009 did youj install it on the carb side? Jug side Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted June 4, 2009 Report Share Posted June 4, 2009 That really doesn't tell us much cause you did it on a large bore single. The bigger the motor, the more difference it seems to make on the dyno. Most stuff with small bores and stock cranks showed maybe a 1-1.5 hp difference between the midrange and the topend. Quote Link to comment Share on other sites More sharing options...
BoostedRex Posted June 4, 2009 Report Share Posted June 4, 2009 That really doesn't tell us much cause you did it on a large bore single. The bigger the motor, the more difference it seems to make on the dyno. Most stuff with small bores and stock cranks showed maybe a 1-1.5 hp difference between the midrange and the topend. That's exactly why we did it on his trike. So we could make sure what difference it made. I honestly believe that it would do the same on a banshee motor but to a lesser degreee. Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted June 4, 2009 Report Share Posted June 4, 2009 That's exactly why we did it on his trike. So we could make sure what difference it made. I honestly believe that it would do the same on a banshee motor but to a lesser degreee. Well I had already stated the difference of what it does from testing it on the dyno. Quote Link to comment Share on other sites More sharing options...
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