Are the 21 and 28 engines the same or not? and whats the difference in the carbs and are they interchangeable as I may have dropped a clanger if not. _________________ If you dont like the way that i ride.....Stop trying to keep up!!!!!
For ease of working on, MC18/21 carbs are certainly preferable to MC28, in my opinion.
Apparently, so I once heard, the MC28 carbs flow a little better, but I've personally yet to see an MC28 make as much power as an MC18 or MC21. _________________ Andy.
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Yeah, but Leigh's got a '21 flywheel, JHA pipes and has been set up.
What we need is Andy's motor with my PGM4, HRC card and '28 carbs to see if anything from the '28 is worth having. _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
Maybe we should have a look at Keiths 28, hasnt that got 70+ bhp???
Also like stephen said, my bikes engine has not been apart for more than 8 years, so a ring change is probably well over due, and its running a little rich to be on the safe side. Then again I still maintain my bike is quick enough considering how reliable its been and how limited the mods are....still standard air box!
Stephen said a ring change would get me a few horses on their own, I have some in the garage so maybe I will give it a go and see what happens.
mick wrote:Bearing in mind the bike is a 21 with just a 28 motor in.
A whole '28 motor?
Flywheel included?
Get ready for a stunning 50 bhp then
Yes a whole 28 motor as far as I'm aware, is there any way I can find out for sure? _________________ If you dont like the way that i ride.....Stop trying to keep up!!!!!
If I do have a 28 flywheel whats the difference with a 21 because I've got a 21 one too _________________ If you dont like the way that i ride.....Stop trying to keep up!!!!!
different advance on the ignition, I am guessing with the 28 one on the 21 bike with PGM III your ignition will be retarded.
When I put the 21 flywheel on the 28 I got advanced timing, not sure how the rest of the ignition will affect it on the 21. Maybe if you have complete 28 it will be fine?????
Personally if you have it available I would swap the flywheel and pickup coils etc from a 21 back into the 28 engine, then everything should be matched to your PGM.
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