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Author Topic: MPS-PG-500 bike project  (Read 5740 times)
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JimL
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« on: June 08, 2010, 01:25:25 AM »

This bike will be for Dan Wagner out of Colorado, former long-time G/BGMR record holder (in the old 797 Roadster) and a motorcycle partner for 40 years.

Starting with the engine; another Honda Silver Wing twin. This engine is ready for measurement, with CP 12.3:1 pistons, WebCam grind from last years successful bike (which is also under reconstruction), Rick Kemp heads with oversize valves, 20lb stiffer valve springs, and a button flywheel.  This engine will be running my Mikuni 36s (from the APS-PG-500 bike), plus properly tuned intake and exhaust.

The engine will be running normal configuration (shaft drive, 3.08 ratio), but I've hand carved the cases and fitted a CX650 trans, mated to a modified CX500 primary drive.  This mod adds over 15% to the original top speed, plus a much higher rev limit than stock engine.

Tomorrow night I'll start on the mild frame mod (a little extra wheelbase and GSX600 front end and wheel).  Chassis will use Airtech Charlie Toy, with my homemade tailpiece.  

This gives me a little something to do while the twin-engine bike is out getting exhaust and intake built.

Regards, JimL


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Beairsto Racing
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« Reply #1 on: June 08, 2010, 07:47:05 AM »

Jim,
Your'e a busy man!
I drove a CX500 during high school. You certainly breathe some new life into these old Honda's. cheers
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oz
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« Reply #2 on: June 08, 2010, 12:07:06 PM »

Your a star I just have to have a beer with you next time!

Oz
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Newcastle born and bred a City built on Coal and Steel and a people built of stronger stuff
nrhs sales
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« Reply #3 on: June 08, 2010, 12:21:32 PM »

Looks like I am going to have to find about 10 more hp in our Buell Blast if I want to be competitive!!
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joea
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« Reply #4 on: June 08, 2010, 03:01:21 PM »

change the cams...

Joe Smiley
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nrhs sales
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« Reply #5 on: June 08, 2010, 03:44:32 PM »

Actually Joe that is not a joke. It is one of the things I would need to do to find more power.
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46champ
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« Reply #6 on: June 08, 2010, 07:19:30 PM »

 grin Dan you do know change the cams will be the answer to any question real or imagined.
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Nortonist 592
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« Reply #7 on: June 08, 2010, 08:04:11 PM »

A Buell will need a lot more than a cam change to make it fly.
« Last Edit: June 09, 2010, 04:33:54 PM by Nortonist 592 » Logged

Get off the stove Grandad.  You're too old to be riding the range.
JimL
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« Reply #8 on: August 03, 2010, 02:18:29 AM »

Well now.....this was a long time gestating.  We are rolling pretty quick, now that the twin engine bike bombed and became a single.  Tonight we got the bike up on wheels with the Katana forks and the well built engine.  We should have this running by the weekend; it'll use all the wiring, fairing, etc. from last years APS bike.

Still some more steel to do at the steering head....we've added about 4 inches to the wheelbase, and a little more rake.

Regards, JimL


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Constant Kinetics
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« Reply #9 on: August 03, 2010, 04:52:58 PM »

Silverwings are another of those bikes you just don't see too many of anymore. Glad to see they aren't completely forgotten. Good luck!
                                                                    -Chad-
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Wierd is good
mike mendoza
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« Reply #10 on: August 03, 2010, 10:54:05 PM »

is Dan's bike   a 4 valve push rod motor? or we talking abour the Blast cheers
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JimL
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« Reply #11 on: August 04, 2010, 11:26:24 AM »

Yes, 4-valve pushrod Honda, based on an old CX500 model.  This pic shows what I started with.


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nrhs sales
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« Reply #12 on: August 04, 2010, 12:02:37 PM »

What do you figure the bike is capable of. Looks like the record is 124.3???
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JimL
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« Reply #13 on: August 04, 2010, 04:11:53 PM »

Hopefully we'll find out this month....last years bike (with almost stock engine) was at about 126 when I shut off at the 2 mile (made the mistake of commiting to run "short-short" on my first pass).  This engine should be stronger, but you never know; the last few weeks have taught me a lot about messing up.....it seems to be an acquired skill, and becomes more powerful as we age!

JimL
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JimL
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« Reply #14 on: August 09, 2010, 01:58:26 AM »

Progress today.....aided by hanging the bike from the ceiling.  I still have to trim the back edge of the fairing (this bike is shorter than last years bike), put on the wiring, numbers, various bits.  No time to change the color scheme....just have to touch this one up and run it.

The tach had to mount upside down (tach cable comes off the front of the camshaft), and the fuel tank is an old Midget oil tank, modified by Rick Kemp (a little over 5200cc capacity).

Regards, JimL


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