Author Topic: Chinese Beatch Modifications. (Read 1059 times)

F Body · « **on:** August 23, 2007, 03:00:33 pm »

Rear tyre before :

Rear tyre after : [img]http://i29.photobucket.com/albums/c294/fbody007/Lifan%20GY200/CIMG3431.jpg?t=1187880585\" border=\"0\" alt=\"\" width=150>Front tyre before : [img]http://i29.photobucket.com/albums/c294/fbody007/Lifan%20GY200/CIMG3428.jpg?t=1187880610\" border=\"0\" alt=\"\" width=150>Front tyre after : [img]http://i29.photobucket.com/albums/c294/fbody007/Lifan%20GY200/CIMG3430.jpg?t=1187880632\" border=\"0\" alt=\"\" width=150>First the good news they have totally transformed the bike, before any speed over 50mph was like driving on ice even on a hot dry sunny day, came back down the M1 Motorway and it was rock steady at 60mph even passing the Lorries [img]http://www.mkb.cc/forum/smileys/up.gif" alt="" border="0" onload="NcodeImageResizer.createOn(this);" class="bbc_img" />

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 · « **Reply #1 on:** August 23, 2007, 03:04:02 pm »

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 · « **Reply #2 on:** August 23, 2007, 03:10:15 pm »

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 · « **Reply #3 on:** August 23, 2007, 03:25:37 pm »

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 · « **Reply #4 on:** August 23, 2007, 03:43:11 pm »

Quoting: Jamieg285

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

Yup, I agree with that . . .

F Body · « **Reply #5 on:** August 23, 2007, 03:45:55 pm »

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 · « **Reply #6 on:** August 23, 2007, 03:46:55 pm »

Bigger motor ? - That'll sort it.

F Body · « **Reply #7 on:** August 23, 2007, 03:49:50 pm »

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 · « **Reply #8 on:** August 24, 2007, 05:57:13 am »

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 · « **Reply #9 on:** August 27, 2007, 05:23:17 pm »

for PhilO.

See you made me spend Money on the Beatch

philoldsmobile · « **Reply #10 on:** August 27, 2007, 05:55:09 pm »

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 · « **Reply #11 on:** August 27, 2007, 06:58:56 pm »

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 · « **Reply #12 on:** August 28, 2007, 08:28:24 pm »

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 · « **Reply #13 on:** August 29, 2007, 06:52:32 am »

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 · « **Reply #14 on:** August 29, 2007, 07:44:12 pm »

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

Jamieg285 · « **Reply #15 on:** August 30, 2007, 08:04:10 am »

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 · « **Reply #16 on:** September 08, 2007, 10:35:07 am »

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