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post #1 of 6 (permalink) Old 12-15-2018, 08:48 AM Thread Starter
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Question over size pistons

I have a 15 rgs, can i bore my cylinders to put in bigger pistons? Will that increase hp. & torque? Is it better & cheaper to buy the big bore kit? Thanks.
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post #2 of 6 (permalink) Old 12-16-2018, 08:01 PM
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Do you have someone local that can bore the cylinders properly and get you the correct size pistons? If so, it is cheaper to go that way

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post #3 of 6 (permalink) Old 12-16-2018, 08:09 PM
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Yes , Yes and Yes .. But just boring will not attain much in the way of HP and torque ..You will gain only a few cubes at best .. You would do better to get a kit ...

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post #4 of 6 (permalink) Old 12-17-2018, 08:31 AM Thread Starter
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Question

I had the stage IV kit installed when i bought the bike. I was thinking if i went .20 or .30 over on the pistons would help?? I have a local machinist to do the work.

Last edited by nanook; 12-17-2018 at 08:34 AM.
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post #5 of 6 (permalink) Old 12-17-2018, 10:35 AM
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Quote:
Originally Posted by nanook View Post
I had the stage IV kit installed when i bought the bike. I was thinking if i went .20 or .30 over on the pistons would help?? I have a local machinist to do the work.


Better look somewhere else if you are after more power, like have it tune properly if your stage iv was done by a harley dealer with only a flash tune. What exhaust you have? Going bigger without all the supportive accessories will not help. Maybe look at 107 or maybe a 110 drop in kit? Talk with shops, like fuelmoto, hillsides just to name a couple they will steer you in the right direction.


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post #6 of 6 (permalink) Old 12-17-2018, 01:15 PM
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You can punch them .005 or .010.

But that's just about reusing jugs, not gaining displacement. 103.19 is what the motor is oem. At 10 over you get a whopping 103.72.

If you want more inches, ya need to step up to 4 inch jugs. You can drop them in with steel liners, or cut the cases and use oem 110 iron lined jugs.


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