i recently bought an mc28 without the pgm1v and clocks.

i have now aquired them via yahoo japan and the help of a really nice chap in japan and am happy to say plugged them in and the bike started easily...

now... with the pgm i got the standard card and a hrc 010 card , and from search's i see that this is supposed to be used with leaded fuel..

so i am going to try to get some pipes and skip the standard items , do the wiresplice then drill 2 holes in the airbox.

does anyone have a rough idea of where to start the jetting? i will be running it on super unleaded..

also which plugs should i be running?

hopefully any problems can be sorted quickly so i can get the top end rebuilt - what pistons do people use, oem or do wiseco or any other aftermarket co's make them ?

there are probably 100 other things but they are the main questions for now

thanks

Who did you make the transaction with?

I've been looking at Yahoo Japan because the parts and service manuals are reasonably priced, but was a little concerned about going through with buying something via that site.

lj,

To be perfectly honest with you, I've ridden MC28s with HRC 010, 030 and the standard Honda card. If the bike is sorted out well and you're not racing, it really doesn't matter. They can all run strongly in the 60 to 64 hp range. Just do the derestriction and start jetting rich. I'm in Southern California so I don't have any baseline numbers for you. I wouldn't even worry too much about the airbox mod, but it's a good thing to do. I run an 010 card, that's what it came with, and I run premium unleaded and sometimes dump my leftover race gas in there. No biggie, but it depends on what you are trying to accomplish.

Cheers,

Joel
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1994 MC28 Rothman
TSR250 AC28M

I'd like to see an MC28 make 60~64hp with a standard card and airbox... an MC18 or MC21 won't even do it without an airbox mod!
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Andy.
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I'm with Andy on this one. The stock airbox is basically way too restrictive to make decent power. It's good for the stock setup, but not for max power.

Why wouldn't you do it anyway? It's a free mod. Just have to pay for jets and setting up time.

i was going to do the airbox as it seems daft not too.. i got the pgm unit and clocks after a really nice guy contacted me from japan after i asked for some help on micaeak , the chap has been a star really - he bidded on the parts on japan auctions for me simply trusting i would send him payment after he paid for them..

to be honest he was a great help and it make's you realise that in general bike people are good people.. it cost me £360 inc shipping for clocks that only have 500km on and pgm with standard and 010 card..

hopefully the jetting wont be to much hassle although i have a sneaky suspision by the number of threads on here that it might!

im guessing i can order the jets from my local honda dealer with the part number...? all i need is an idea on which ones to get if anyone has any help on that i'd be gratefull.

So rather than argue over 5bhp that is probably just dyno differences I'll just answer your questions;

Personally I wouldn't run an 010 card on unleaded fuel full stop, if HRC thought it was OK they'd never have made the 030 card but if you must try it (and a '28 on the std card and flywheel will never make near 60bhp, Tyga put a '21 flywheel on, a modded airbox, fancy reeds and rectifiers and only got 58, dyno graph here ) then you probably want to go to at least 170 if you're just going to change the main. If you're buying the jet kit and plugging the powerjets I'd put the 200's in to start off, it will run, wheather it will die if held flat out or not is another matter and if you're not going to hold it flat out why bother changing cards?

Plugs? BR9ECMs or BR10ECM's

OEM pistons are fine
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is there anywhere i can order a jet kit from ?
im going to have a go with the 010 card and super unleaded and see what happens -
all i'm really looking for is a reliable (ish) 60bhp
also i need a new filter element as the one in it appears to be dissintergrating - i'm assuming the filter stays in place after you modify the airbox - does anywhere stock these? or have a part number..

lj wrote:
...also i need a new filter element as the one in it appears to be dissintergrating - i'm assuming the filter stays in place after you modify the airbox - does anywhere stock these? or have a part number..

Er... Online Parts Manual?! Link to the left!
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Andy.
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so it is....

We had a 1999 SE with the standard card make 62 hp. Whether it had a modified airbox, I don't remember, but I did say that it was a good idea. A friend had a standard card and did the derestrict and airbox mod and it made 60hp. I have a standard airbox and an 010 card and I make 62 hp. I guess that it is possible.

Joel

[/url]http://homepage.mac.com/joelmanes/PhotoAlbum20.html[url][/url]
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1994 MC28 Rothman
TSR250 AC28M

Well on our dyno a '28 with a 300 kit and stock card struggles to make 55hp. A good '28 with pipes, HRC 030 card, HRC jet kit, HRC head convert, and no air box will pull about 62hp (thats yours Fontyyy).

So 62 with a stcok card is something very very special indeed.
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If I have to take the carbs off once more...

62hp at the crank I reckon.

Less the approx 12%, and we're back at 55hp!
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Andy.
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i'm really not to bothered about the hp to be honest lad's , i've got a gsxr1000 in the garage for when i want to go fast - i bought the nsr for it's look's and handling and the the fact you can thrash them nearly all the time in comparison to the gsxr which you can't.

i got a mc28 because they still look cool and because i want to relive my youth a little.. 60bhp is plenty...
i will be concentrating more on the handling than the engine as i remember my last nsr being somewhat lively on bumpy roads.

I hear what you're saying, but a 55hp MC28 is FLAT! There's no top-end rush to them. 5hp sounds like nothing, but it "feels" a lot on a small capacity motor.

My 21 makes less than 5hp more than Fontyyy's 28 (and Wayne's 1, but ask them what the difference feels like!
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