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post #1 of 12 (permalink) Old Aug 7th, 2019, 12:58 pm Thread Starter
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My 250 single

Really considering trading or selling my little 250 project bike.

I'm having a hell of a time finding a front end and wheels for
not stupid prices. It's completely original being that no two parts came from the same bike. I've sourced every single part
starting with the engine cases with pictures here: https://akress.com/monoster.php

It runs but I'm not sure how well yet under a load. It's also titled in Ohio and so damn close to "road worthy".
I'd kinda like to just trade it off for an old beat up monster and be done with it.

Any thoughts?
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post #2 of 12 (permalink) Old Aug 7th, 2019, 10:10 pm
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There are a lot of parts floating around for those things you just have to dig. Dave Chrone, a singles engine builder and who used to race them has stuff, I will PM you his email

Failure is not an option 1995 Duc 916,1994 Bim DB2,1986 Duc MHR Mille, 1974 Duc 750 Sport, 1965 Duc Monza
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post #3 of 12 (permalink) Old Aug 8th, 2019, 7:16 am Thread Starter
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Hey, thanks for the reply. I think I've worn out a few shovel digging over the last few year.

I'm going to send a messages off to Dave today.
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post #4 of 12 (permalink) Old Aug 8th, 2019, 10:05 am
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Quote:
Originally Posted by enzochi View Post
Hey, thanks for the reply. I think I've worn out a few shovel digging over the last few year.

I'm going to send a messages off to Dave today.
You're welcome. I am building a bike for Moto Giro from a 250 Monza - frame and everything - and, naturally, I gave away the rims. You may considering putting alum rims on the bike since everything is heavy. My new frame weighs about 16 lbs vs almost 40 on the orig. There's another guy who has stuff, Roy Kidney, who also has a number of very nice restored singles. I will call him.

Failure is not an option 1995 Duc 916,1994 Bim DB2,1986 Duc MHR Mille, 1974 Duc 750 Sport, 1965 Duc Monza
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post #5 of 12 (permalink) Old Aug 8th, 2019, 10:36 am Thread Starter
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Quote:
Originally Posted by casor View Post
... My new frame weighs about 16 lbs vs almost 40 on the orig. .
That sound really cool! Do you have pics?

Last edited by enzochi; Aug 8th, 2019 at 11:47 am.
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post #6 of 12 (permalink) Old Aug 8th, 2019, 1:21 pm
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Here's a list of what Dave did on the engine. He said it should make about 28 hp

Cylinder, cylinder head, cases and valve covers vapor blasted
Cylinder head repair - weld and re-tap threads on single Allen head boss
Rebored cylinder to fit stock 76 mm 9.5 to 1 compression 350 Mark 3 piston/new rings
New piston rings
Install larger intake and exhaust valves from 350 Mark 3
Clean out crankshaft sludge trap
Lightened clutch center hub, pressure plate and basket
Lightened oil pump gear and points shaft gear
Installed new stator plate and flywheel
New bearings
External aluminum cases polished
Replace oil screen
Install Electrex World STK-161 electronic ignition system with 120 w alternator
New countershaft sprocket
New ignition timing points cover
New engine sealing gaskets
Valve job on head and port to fit 40/36 mm valves
Stainless steel hardware
Install new clutch plates
Installed new kick start bushing, shim and retracting plate
Port head for 30mm carb
Install Scrambler cam
Repair valve cover mount - installed 4 helicoils in the head
Replace needed shims and misc hardware
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Failure is not an option 1995 Duc 916,1994 Bim DB2,1986 Duc MHR Mille, 1974 Duc 750 Sport, 1965 Duc Monza
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post #7 of 12 (permalink) Old Aug 9th, 2019, 3:58 am
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you sure went to town on the frame . is there any original tubing left ?

rear swing arm oval tubing ?

btw 28 rw hp is a bit optimistic .

Eldert
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post #8 of 12 (permalink) Old Aug 9th, 2019, 9:42 am
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Quote:
Originally Posted by Eldert View Post
you sure went to town on the frame . is there any original tubing left ?

rear swing arm oval tubing ?

btw 28 rw hp is a bit optimistic .

Eldert
My frame guy has all the tubing which is 4130. It's readily available from many different supply houses. He made the oval tube using a press. The eng mounts I designed in CAD and were cut on a water jet from 4130 sheet as was the lower frame jig which was 1018 mild steel.

I have no reason to doubt Dave who's built and raced many of these, plus the bike is no longer a 250, closer to 300 but still under the MG requirements. Higher compression, larger valves and carb and different cam.
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Failure is not an option 1995 Duc 916,1994 Bim DB2,1986 Duc MHR Mille, 1974 Duc 750 Sport, 1965 Duc Monza
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post #9 of 12 (permalink) Old Aug 9th, 2019, 9:51 am
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you only gain 12 cc by going to 76 mm bore . 0.785 X 5.78 X 7.6 X 7.6 = 262 cc .

i had LA sleeve make me some bigger liners with 84 mm O.D.

and J/E made some oversize pistons for me in 79.50 and 80 mm

with the 80 bore you get 290 cc .

at the moment i am taking out a 340 Sebring to 372 for my play bike .

Eldert

Last edited by Eldert; Aug 9th, 2019 at 9:59 am.
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post #10 of 12 (permalink) Old Aug 9th, 2019, 9:52 am
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Quote:
Originally Posted by Eldert View Post
you only gain 12 cc by going to 76 mm bore . 0.785 X 5.78 X 7.6 X 7.6 = 262 cc .

Eldert
Maybe you should have built my engine

Failure is not an option 1995 Duc 916,1994 Bim DB2,1986 Duc MHR Mille, 1974 Duc 750 Sport, 1965 Duc Monza
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