si carbs

[paulnobodyimportant]

Hi Jack221

With a standard PX200 gearbox, albeit with a T5 4 gear, what gearing would you suggest to take advantage of the revs, with say a suitable expansion pipe. Woukld it just be a case of changing the clutch housing??

[johnny rotten]

Alright jack, I've read the link you posted n it mentions that the 22 tooth gear can be fitted with a standard 65 tooth primary drive is this the combination that you've used, if so have experienced any problems?

[Jack221]

With or without the T5 4th, I have always fitted the 22 tooth clutch in any Malossi 210. They are tuned for power at the top of the rev range, at the expense of the torque. I have never fitted the 21 tooth with the 65, that would be a bit too slack for my liking.
With the 22 tooth gear the same 210 will actually be slightly faster top end than before with the 23 tooth.

[johnny rotten]

So just to confirm its the sip drt 22 tooth clutch gear you use with a standard piaggio 65 tooth primary drive?

[Jack221]

The DRT one is straight cut teeth! The standard COSA2 Piaggio 22 tooth fits the 65 tooth ring gear. I think the 22 tooth is originally from a PX150

[johnny rotten]

How many miles are you getting out of a 22 tooth cog before you need to change it jack I've heard they wear quick with this set up?

[Jack221]

Where did you hear that? Do you have yours or anyone else's picture of a worn one? If SIP and Worb5 both say they fit and they don't there must be plenty of examples out there
I could understand with the 21 tooth though!

[bazman]

To be fair I've heard that as well, pretty sure the germans were running these years ago, and did hear issues arising, but never tried so can't really say!

[johnny rotten]

I asked Harry Barlow about that arrangement n he mentioned that its known for wearing quickly, I thought i'd ask what your experience was first before I considered trying it. Do you know how many miles your getting out of your 22 tooth clutch gears?

Cheers

John

[Jack221]

I have not seen or heard a bad word about them. The one in mine has been in at least 3000 miles. Others I have done must be more by now. Mines a highly tuned Polini barrel so, I only put it in to try it and it went so well I don't want to take it out. With the 22 It's now pulling just over 8000 rpm in 4th on the flat. And I'm the size of 2 normal people!
I could probably get away with just putting in a T5 4th but if it is worn next time I split it I'll might put in a DRT 22 straight cut with Polini 64 ring and keep std gearbox.