Chinese Beatch Modifications.

[F Body]

Rear tyre before :

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Now the bad news £85 for both tyres ( dam good price for German Continentals though ) and this next bit really hurts £50 to fit them
I'd normally get my tyre levers out but there was no way I can bend down to do them with my gammy leg

Did some RPM checks with the current 17 tooth front sprocket for reference when I fit the new 15 tooth spocket :

30mph = 3,000 rpm.
40mph = 4,000 rpm.
60 mph = 7,000rpm.

Should get the new sprocket Friday, so it'll be interesting to see how much it drops the revs when cruising and should also increase the top speed

[Jamieg285]

Quoting: F Body

Did some RPM checks with the current 17 tooth front sprocket for reference when I fit the new 15 tooth spocket :

30mph = 3,000 rpm.
40mph = 4,000 rpm.
60 mph = 7,000rpm.

Should get the new sprocket Friday, so it'll be interesting to see how much it drops the revs when cruising and should also increase the top speed

Maybe my maths are wrong, but won't a smaller cog mean higher revs and lower speeds?

[F Body]

Quoting: Jamieg285

Maybe my maths are wrong, but won't a smaller cog mean higher revs and lower speeds?

I was thinking smaller sprocket at the back would indeed reduce the speed/increase revs but smaller at the front engine case would increase speed/reduce revs

[Jamieg285]

Less teeth = more rotations to move the same number of links = higher revs.

Think of a push bike - to pedal the quickest and go slowest - small front/large rear. To go fastest with less pedalling - large front/small rear.


I think you've ordered the wrong part

You want either a bigger front sprocket or a smaller rear one.  I don't know which one is the best to change - I guess you'd need to know the current number of teeth on both front and rear, and what the swappable options are to try and work it out.

[Roadkill]

Quoting: Jamieg285

You want either a bigger front sprocket or a smaller rear one

Yup, I agree with that . . .

[F Body]

Quoting: Jamieg285

You want either a bigger front sprocket

Won't fit inside the casing

Quoting: Jamieg285

or a smaller rear one.

The current rear sprocket has 46 teeth but I can't find an alternative ( smaller or bigger )

Looks like it'll be staying with the same gearing then

[Roadkill]

Bigger motor ? - That'll sort it.

[F Body]

Quoting: Roadkill

Bigger motor ? - That'll sort it.

Nope 200cc is the biggest single cylinder Beatch you can buy, unless you go V twin which are 250cc up to 650cc

Hell 7,000rpm at 60mph ain't bad, the Beatch don't red line until 11,000rpm

[F Body]

Stupid Boy Pike

Am I paying the price for riding the Beatch into town yesterday to get the new tyres fitted.
My plan was to change the tyres so that when I go back to work I'm less likely to fall off it and to give it a run out because it hadn't been used for nearly five weeks.
I could hardly move last night and this morning my dodgy knee is all swollen where the body armour has rubbed

[F Body]

for PhilO.

See you made me spend Money on the Beatch

[philoldsmobile]

gotta be better than ending up a red smear on the road eh?

i suddenly thought, yeah, smaller front = lower gearing.. sure you cant ge a 1 tooth bigger front sprocket on?

mine was tight as hell, but it JUST cleared

[F Body]

Quoting: philoldsmobile

sure you cant ge a 1 tooth bigger front sprocket on?

mine was tight as hell, but it JUST cleared

Can't find an 18 anywhere

[philoldsmobile]

then get a rear sprocket that is the same width, but a couple of teeth smaller.. drilling bolt holes to suit the PCD of the beeeyatch cush drive wont be hard...

[F Body]

Quoting: philoldsmobile

drilling bolt holes to suit the PCD of the beeeyatch cush drive wont be hard...

Crush Drive

Dream on the Beatch is solid bolted onto the wheel hub

[philoldsmobile]

i'm guessing the wheel itself contains a cush drive though? never seen one that doesn't

[Jamieg285]

Quoting: philoldsmobile

i'm guessing the wheel itself contains a cush drive though? never seen one that doesn't

We are talking Chinese engineering here....

[F Body]

Took the Beatch out for it's first proper run in two months this morning.

Started fine ( thanks trickle charger ) and as I said before the new tyres have transformed the handling
Crisp turn in at low speeds and I had 75mph on the clock on a flat road, no drama just wound the Beatch up and there was still some more left but I ran out of dual carriage