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Milwaukee 8 Big bore kit install Step by Step by Fuel Moto

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Old 02-01-2017, 12:55 PM
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Default Milwaukee 8 Big bore kit install Step by Step by Fuel Moto

We are disassembling the motor on our 2017 Milwaukee Eight bike today in preparation of our big bore kit R&D. We will be installing big bore piston/cylinders and testing several custom bore sizes we had made. We will also be testing an assortment of cams, cylinder heads, and other assorted components. We have a load of parts here ready to be tested including injectors, throttle bodies, exhaust systems, clutches, etc.. so it is going to take some time to get thru everything. We'll try to keep this thread updated as we go, we have a full schedule of customer work so our M8 R&D will extend to a lot of late nights and weekends. We greatly appreciate everyone's interest and patience as we get thru this testing.

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Jamie Long / Fuel Moto USA
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Old 02-01-2017, 01:15 PM
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Thanks Jamie..
Looking forward to following this thread..
Rich
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Old 02-01-2017, 01:28 PM
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Originally Posted by fuelmoto View Post
We are disassembling the motor on our 2017 Milwaukee Eight bike today in preparation of our big bore kit R&D. We will be installing big bore piston/cylinders and testing several custom bore sizes we had made. We will also be testing an assortment of cams, cylinder heads, and other assorted components. We have a load of parts here ready to be tested including injectors, throttle bodies, exhaust systems, clutches, etc.. so it is going to take some time to get thru everything. We'll try to keep this thread updated as we go, we have a full schedule of customer work so our M8 R&D will extend to a lot of late nights and weekends. We greatly appreciate everyone's interest and patience as we get thru this testing.

Is this just the 107 big bore kit or are you planning to do research on a 117 M8 stage 4 kit?
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Old 02-01-2017, 01:37 PM
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Is this just the 107 big bore kit or are you planning to do research on a 117 M8 stage 4 kit?
All of the piston/cylinder combinations we are testing are custom components using the stock 4.375 stroke on the 107" M8 engine.
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Old 02-01-2017, 02:32 PM
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Some images with the rocker covers removed:





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Old 02-01-2017, 05:15 PM
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Some assorted images of the M8 engine during disassembly











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Old 02-01-2017, 06:42 PM
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Some assorted images of the M8 engine during disassembly











Jamie how many miles was on this engine before you tore it down? Reason asking this was wondering if the amount of carbon build up on pistons is normal for this engine.
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Old 02-02-2017, 07:36 AM
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Great thread so far man !!!! Thanks for taking the time to post all of this while i am really looking forward to the results.
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Old 02-02-2017, 07:47 AM
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Old 02-02-2017, 12:18 PM
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Jamie how many miles was on this engine before you tore it down? Reason asking this was wondering if the amount of carbon build up on pistons is normal for this engine.
Motor has just under 2000 miles, and a good amount was on the dyno. I'm not too concerned with the carbon as it is pretty typical of most of the engines we disassemble, also consider we used this bike to develop all of our 107" calibrations so it spent more time than normal in an untuned state as we worked thru building maps. I will say that this motor did not have great ring seal initially, as others have noted with their M8's ours puffed some blue smoke when it was new before the motor got up to temp, however after some miles the smoking disappeared so we were not concerned.
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