125 performance

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Re: 125 performance

Postby badger34 » Mon Apr 15, 2019 3:39 pm

Mutt wrote:get out that 165 and fire it up !!!!!


Yes, after I button up my shovelhead project this summer I will start looking for a rolling chassis or parts. A friend just moved onto a small private lake and I want to build something to play with on the ice during the winter months. Also, my nephew has two boys so I need another runner built up to pass on down to the boys.
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Re: 125 performance

Postby houserjw » Tue Apr 16, 2019 10:15 am

When working on the piston skirt, would it be better to drill the three holes or cut the skirt away as shown in the drawing? Is there any positives/negatives to each one?

Thanks
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Re: 125 performance

Postby Mutt » Tue Apr 16, 2019 10:56 am

on the 125 piston, notch the skirt, on the 165 piston, I would hole the 4 or 5 holes. When ya notch the 165 piston as shown, it leaves only 1/4" or so of the skirt left on either side and they do break off.
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Re: 125 performance

Postby HarleyHummer.com » Wed Apr 24, 2019 3:54 am

Jon,


I would contact Tom VanBeek in regards to your Hummer engine (125, 165, 175 ) rebuild for that matter!

Tom VanBeek currently holds several titles as the worlds fastest Hummer engine builder!

Toms engine rebuilds have long dominated world famous tracks such as Davenport Iowa 1/2 mile dirt flat track, Wauseon Ohio 3/8 mile limestone, and even the Bonneville Salt Flats!

In fact, he build a 125cc Hummer engine that shattered the existing top speed record at the Bonneville Salt Flats in 2017, only to come back in 2018 and shatter it again!

Tom VanBeek builds the "Worlds Fastest Hummer Engine" and you would be selling yourself short , not to talk to Tom!

Tom is a member here and can be reached at 262-338-8986 .
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Re: 125 performance

Postby houserjw » Tue Apr 30, 2019 12:13 pm

Thanks, I will contact Tom but I don't need record breaking, just fast enough to keep up around town. I have been porting, polishing and notching. It's looking really good compared to what was original. It's hard to believe it ran with all the restrictions in the ports. I'm excited to see how much this will help when I get it all back together. I'll post reports when it runs.
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Re: 125 performance

Postby houserjw » Wed May 01, 2019 4:57 pm

I talked to Tom last night and he helped me greatly. Thanks for the advice. He is super helpful and loves this hobby. I have a bit more porting to do but I feel like I'm on the right track. I forgot to ask him something, he said to use copper for a head gasket. Is there a recommended thickness for one?
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Re: 125 performance

Postby Mutt » Wed May 01, 2019 5:58 pm

Do you weld up the head and machine a squish band? If you did, the gasket will vary in thickness. If you didn't, I would use .015"
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Re: 125 performance

Postby houserjw » Thu May 02, 2019 11:37 am

Thanks, I did not weld up the head, just polished and decked it about .050 so I will order some copper sheet.
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Re: 125 performance

Postby houserjw » Thu May 02, 2019 1:15 pm

cylinder.jpg
cylinder.jpg (347.79 KiB) Viewed 527 times


I'm making progress. If nothing else, the bike will be lighter when I have to push it home.
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Re: 125 performance

Postby houserjw » Tue May 07, 2019 11:10 am

hummer.jpg
hummer.jpg (297.16 KiB) Viewed 473 times
So I finally think I ported the cylinder, piston and the head to where I'm happy with them. I am about to take the motor apart to port the cases and I noticed I only have one set of points. The book shows two. The headlight worked like this but it was pretty dim. Is this normal or am I missing something?
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