Anyone have a view on which are better, the MC21 or MC28 carbs? Both are 32mm, however the bore shapes are different.

I'm looking for outright power & performance as the bike is destined for the track. Any help or advise appreciated.

Thanks

Dan
07919 303762
dan.williams@s-n.com

From everything I know, the 21's produce more power. The 28's are tuned for power lower down the rev range.
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The 28's are shorter, so "should" give more top end.

However, I haven't back to backed them on the brake.

A job for Stephen methinks

I'd rather change needle postion on a '21 carb any day over the '28....
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If I have to take the carbs off once more...

Come on Steve...It only takes a day on the 28!

They're only bad if you try to do it in the same fashion as you'd do a '21 - in situ is not a good idea, it's easier to get the carbs totally off and get the needle holders out, you need to undo the link between them and twiddle the adjuster right in to make enough room on the front cylinder carb.

So the length of the job is dependent on how easily you can get the carbs off.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

So '21 it is then as you dont even need to remove the carbs
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If I have to take the carbs off once more...

Steve, surely not - you must love taking carbs off....

you do it so often!
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

You know I can't stand something that doesn't carburate perfectly, which I admit means re-jetting almost every day to keep it just where I want it lol
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If I have to take the carbs off once more...

Steve loves jetting so much that we had to beat him off of Paul's 21 with a stick 'cos he just couldn't leave it alone.

Or maybe it was Paul's amazing ability to feel when the jetting's an 1/8 of a jet out.

Now you know how I feel Steve.

I know how you feel Matt.

I do get alittle bored on holiday so the chance to play with some carbs was very welcome.

Going back to the topic though, I think as '21 carbs are so much nicer to work on I would choose them over '28's.
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If I have to take the carbs off once more...

Have to agree there of course. MC21 carbs are a breeze to work on. I always used to have a quick groan when I needed to change the needle, or move a clip on my 28 race bike. Carbs off, pull 'em to pieces, blah blah blah. Not exactly something you'd want to do half way through qualifying or something. MC21 much quicker. Whip off the tank, yank off the cover and you're straight in there.

Proper PJ/PWK carbs are even better. If you're lazy you can even change a needle without pulling the tank off.