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Re: Star

Post by minetymenace » Fri Jan 31, 2020 9:38 am

beat, I don't understand
beat wrote:new metric size bearings and bushings
<201 :roll:
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Re: Star

Post by beat » Fri Jan 31, 2020 10:04 pm

minetymenace wrote:
Fri Jan 31, 2020 9:38 am
new metric size bearings and bushings
yes, all the flywheel bearings are metric size now, - as they are smaller in outside diameter it needs bushings.
as I bought the flywheel in pieces and not balanced, and using a much shorter piston to compensate the 14 mm additional stroke:
this work is not made by myself, no, - it is done by Marcel Gerhard in Frauenfeld.
Gerhard Racing is a well known specialist for crankshafts and engines here around....

anyway:

The head
DSCN1646.jpeg
drilling the holes for the four long studs right trough ....
DSCN1648.jpeg
surching and preparing....
DSCN1649.jpeg
cuting space for the nut ....
DSCN1647.jpeg
newly four nuts from topside holding head and barrel in place ( like B50 )
DSCN1645.jpeg
checking flywheel and piston for clearance
<216 <216

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Re: Star

Post by beat » Sat Feb 01, 2020 8:30 pm

DSCN1650.jpeg
fitting new lightweight valves
DSCN1651.jpeg
big ports for the old Goldie now...
DSCN1653.jpeg
nice piston from Wössner
DSCN1655.jpeg
and go for measuring comp ratio
and unlucky, 8.2 : 1 is the result.
as I surch for around 9.5 : 1, the barrel has to be cut at the bottom by 1.7mm ...

<216
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Re: Star

Post by Jack Gifford » Sun Feb 02, 2020 6:09 am

beat wrote:
Sat Feb 01, 2020 8:30 pm
... the barrel has to be cut at the bottom by 1.7mm ...
And... custom shorter pushrods?
... "Bigger ports"... Different head? Or did you "carve out" the ports?
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Re: Star

Post by beat » Sun Feb 02, 2020 8:39 pm

hi Jack
Jack Gifford wrote:
Sun Feb 02, 2020 6:09 am
And... custom shorter pushrods?
... "Bigger ports"... Different head? Or did you "carve out" the ports?
yes, I think I have to make shorter pushrods. but how much shorter I will see when barrel is finely fit, same as head and cams.

about different head : Inlet is made wider by 4mm, exhaust I am scary to made because the ugly crack in there gos right trough to the insert.
I just hope this old head is holding the next season because our budget of 10 000.- Sfr. for this winter preparing is already dried out by the new Reiger Shocks and this engine parts.

unlucky there is a endless list of wishes but NO endless money in the pocket.... :werd

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Re: Star

Post by beat » Wed Feb 05, 2020 8:17 pm

DSCN1656.jpeg
barrel on the mill
DSCN1657.jpeg
cut off the feet gos faster than getting a higher piston....
next job is to shorten the pushrods to match the shorter barrel...
<216
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Re: Star

Post by beat » Sun Feb 09, 2020 8:43 pm

DSCN1663.jpeg
Pushrods shortened by 2.5 mm, - all is inside....
DSCN1664.jpeg
engine slowly fit in place....
<216

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Re: Star

Post by beat » Thu Feb 13, 2020 9:27 pm

&lt;069 &lt;069

Engine is running !! ( Started by kickstarting, - no decompressor needed !! ) - and it comes by second kick !
but it is really hard to get it over TDC with this 650 ccm and 9.1 Comp Ratio, together with a new modern piston in a nicasyl coated barrel.

beat :grin: :grin: :grin:

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Re: Star

Post by minetymenace » Fri Feb 14, 2020 9:00 am

Well done. :ok

Have you ever considered electric start on a BSA single beat?
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Re: Star

Post by Jack Gifford » Sat Feb 15, 2020 5:59 am

Minety- are you joking? Or don't you read your own forums? :roll:
"Motley" bike history: Horex 400, 1940 HD 45 FH, HD Baja 100, '49 Indian Scout 440, Victor 441 Roadster, H*nda TL125, Guzzi V50, H*nda FT500, 400-4, NX250
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Re: Star

Post by minetymenace » Sat Feb 15, 2020 4:37 pm

Irony is so wasted on our American cousins....
There is no evidence to support the notion that life is serious.
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Re: Star

Post by beat » Sat Feb 15, 2020 10:02 pm

minetymenace wrote:
Fri Feb 14, 2020 9:00 am
Have you ever considered electric start on a BSA single beat?
well, - Motocross racing makes me feel 20 years younger, - so I do not waste any thinking about this.....

:lol: :lol: :lol:

starting to made my own Kill Switch today...
DSCN1665.jpeg
the housing, - a first go...
<216

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Re: Star

Post by Jack Gifford » Sun Feb 16, 2020 5:50 am

minetymenace wrote:
Sat Feb 15, 2020 4:37 pm
... Irony is so wasted on our American cousins...
The sarcasm emoticon was so wasted on minety... :roll:
"Motley" bike history: Horex 400, 1940 HD 45 FH, HD Baja 100, '49 Indian Scout 440, Victor 441 Roadster, H*nda TL125, Guzzi V50, H*nda FT500, 400-4, NX250
Aside from bikes: known as the "guru" of M/T hemi Pontiacs

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Re: Star

Post by beat » Wed Mar 04, 2020 9:11 pm

DSCN1667.jpeg
Job finished
and it is working good !
as a surplus, I can dismantle the all switch by every detail and give it a clean from time to time.... :cool:

next job:
DSCN1673.jpeg
new needle for the Mikuni TM 36-2
now, as the engine is renewed, I come back again to the fine tuning of the carbi.
Bildschirmfoto 2020-02-22 um 23.17.36.png
surching for A/F Ratio of 11.7 to 13.5
DSCN1672.jpeg
as commonly: a bit a longer process.....
beat <216

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Re: Star

Post by beat » Sat Mar 28, 2020 8:43 pm

well, I came to this :
DSCN1699.jpeg
Needle mesurements for the Mit TM 36-2 carb
but, - it needs this modification as well:
DSCN1695.jpeg
the Trottle Valve No 4.0 needs cutting
I call it " the side gaps "
this side cutouts are in a place where it dos NOT affecting the trottle position, means : NO additional air when slide is in trottle position.
DSCN1697.jpeg
two slides: 4-0 with cuts, and 5.0 in original
basicly, - this carbi is making too rich by around 15 % to 30% trottle pos. ( A/F Ratio of 10:1 to 11:1 :cry: )
so, - this is why it needs this slide modification.

IMO the only way to get a nice and even A/F R over the range from 0 % to 35 % trottle.

I will come up with the jetting after one ore two more testrunns.
<216
Last edited by beat on Sat Mar 28, 2020 9:27 pm, edited 1 time in total.

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Re: Star

Post by beat » Sat Mar 28, 2020 9:15 pm

corona say thanks, I have the time to try to solve two more smal problems.

Gearbox and primary drive

at the gearbox, - in race mode, - it happens some time, I could not shift down from 2.end to first gear straight on.
I dropped in to zero position, - very ugly!
so I took out gearbox to get on to the cam plate.
DSCN1705.jpeg
filling the zero positioning by welding
and make a much smaller gap for zero position fixating.
DSCN1710.jpeg
smal position notch
I have not tested it now, but I hope it may help....

a other weak point is the Belt Drive, used for MX on a Side bike where the cooling of the clutch and the belt is not easy to do.
on one hand, clutch and belt drive needed to be protected from mud and dust, on the other hand, some cooling is needed.
DSCN1711.jpeg
starting with a idea and a disk...
DSCN1713.jpeg
cutting some wings.... ( 6 pieces )
DSCN1714.jpeg
welding the wings in place....

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Re: Star

Post by beat » Sat Mar 28, 2020 9:25 pm

DSCN1715.jpeg
give the wings a hyper- aerodynamic form....
DSCN1716.jpeg
fit the wingwheel on to the crankshaft
DSCN1717.jpeg
and drilling some holes in the primary cover to feed the turbine....
not tested as yet, but I guess, I can't do much wrong by this.
to see, is there a good air circulation now, it needs to run the engine longer and harder for a while.

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Re: Star

Post by SteveS » Sun Mar 29, 2020 9:57 am

Hi Beat

You never cease to amaze me with your ideas and innovations :thumb As Plato said 'Necessity is the mother of invention'.

Regarding the 'the wingwheel', it will be interesting to see how it performs with hard use. You may find you may have to adjust the angle of the vanes so that it acts more like an impeller and sucks the air in through the holes in the outer cover. You may also need to consider that if you pull the air in, it will also need to exit? Will you be fitting a fine mesh behind the holes you have drilled to stop ingress of dirt or would it block up too easily?

Good luck and keep safe
Steve Sewell

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