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Stroking the 45

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DAK

Posts: 64

Joined: Tue Sep 09, 2003 12:01 am

Location: Rancho Cucamonga, CA USA

Post Fri Jun 21, 2013 12:48 pm

Stroking the 45

I'm getting ready to rebuild my 45 and am contempating stroking it. I'd like to get some feedback from the guys that have done this. Was it worth it? How noticeable was the performance improvement? Are there more problems or issues as the stroke increases (clearances, necessary mods)? Any feedback would be appreciated. There are a lot of posts mentioning stroking the 45, but not many that actually give info on the performance increases. Thanks.
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ozihotrod

Posts: 70

Joined: Mon Apr 17, 2006 9:13 pm

Location: South Australia

Post Sat Jun 22, 2013 2:52 am

Re: Stroking the 45

Best thing you can do to a 45, I have just done mine, 4&7/16 stroke .070 pistons, all done as per booklet you can get, KHK cams advance 1 tooth on the inlet, heaps of low down pull, i ride at 55mph, snap the gas on, I see the front forks rise up as I axcell off down the road, have only done about 300mile on the motor , when it is run in abit more i will see how she really goes, after ridin the stroked motor my stock 45 is boring. but cool. Lota work bit worth it.
cheers Rod
" The more I learn the less I know"
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DAK

Posts: 64

Joined: Tue Sep 09, 2003 12:01 am

Location: Rancho Cucamonga, CA USA

Post Mon Jun 24, 2013 12:48 pm

Re: Stroking the 45

Thanks, ozihotrod. Did you go with larger intake valves? Stiffer valve springs?
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MarkBranst

Posts: 341

Joined: Thu Jun 24, 2004 12:01 am

Location: Champaign-Urbana, IL

Post Mon Jun 24, 2013 2:30 pm

Re: Stroking the 45

DAK,

I am guessing that you need to order this book as a starting point ...

http://tinyurl.com/n5runrp

It is one of a series of publications written by a former member of this list. For $20, I don't think that you could wrong.

Mark
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DAK

Posts: 64

Joined: Tue Sep 09, 2003 12:01 am

Location: Rancho Cucamonga, CA USA

Post Wed Jun 26, 2013 2:32 pm

Re: Stroking the 45

Thanks Mark. I have the book. Was just looking for peoples real world experience with stroking.
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ozihotrod

Posts: 70

Joined: Mon Apr 17, 2006 9:13 pm

Location: South Australia

Post Wed Jun 26, 2013 7:41 pm

Re: Stroking the 45

DAK, I fitted standard exhaust valve with a larger Inlet valve from KNS, standard valve springs shimmed up as per the booklets, ported and relieved the inlet, 38mm mikuni carb.
" The more I learn the less I know"
<<

DAK

Posts: 64

Joined: Tue Sep 09, 2003 12:01 am

Location: Rancho Cucamonga, CA USA

Post Thu Jun 27, 2013 12:58 pm

Re: Stroking the 45

Thanks again, ozihotrod.

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