@hollywooduno
my calculations tell me that e.g. a dia 83 mm bigbore increases the capacity by incredible 4.7 per cents
maaaaaaaaaaaaaaan
what an increase 1299 to 1364 ccm - what an unbelievable new volume - seems barely manageable.
irony end
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my exps - arose from miserable experience with a turbo with 83 pistons
the head gasket is in constant danger of blowing through
the 1/3 narrower partitions between the cylinders
the heat balance in the cooling circuit is slightly out of balance - a 2nd fan should be installed and always start up with the 1st
the costs are immense - (prices here in germany - only material)
drilling and honing approx. 500 €
new nikasil coating approx. 600 €
83 piston set woesner approx. 700 €
83 head gasket approx. 120 €
sum - round 2000 €
for basically nothing, except for a constantly endangered engine
my tip
if you want a little more acceleration change the rear sprocket from the standard 40 to 43 or 44 teeth - THAT should be enough to get the front wheel up when shifting
if you don't like that, add a 6-8" longer swingarm
if you really want to have a LOT more power, then build a turbo on it and let it press up to 0.8 / 1.2 bar (300 / 380 hp) but leave the cylinder bore original.
the big bore is a shear nonsense and is only a mental bobo prolongering.
exept you fight at the drag race for the last hp - then costs are no more an argument - see what
@202mphbusa built and ask him what invest he did the last years.
if u won´t believe me ask kojak - member here at the org and a good buddy.
in the last 20 years i guess he already built more than 2 dozens of turbo haya and all of em with standard piston sizes
so save ur money and your time
change the rear sprocket (max. 50 bucks)
and train how to manage best the interaction between throttle and clutch lever.