I just bought a 1995 MC28 and so far think it's a hoot even though it's not as fast as my TZ250 or R1!! It is under sprung for me and I am considering converting to USD fork rather than have the stocker reworked. Has anyone posted a list of forks that will work and what other mods are required?
Is the stock rear shock worth rebuilding or are better aftermarket shocks available at reasonable cost, if so from what vendor.
The bike has a nice aftermarket exhaust and came with the HRC card. I plan to derestrict the wire so the HRC card will work, will the stock card work after the wiring is changed and what will I lose after the modification. Ive heard that the MC21 ignition will improve performance, can anyone confirm and are there any drawbacks.
Tyga advertises a modified airbox,can the stock unit be modified and if so what needs to be done.
I hope all these questions haven't just been addressed, I didn't see any recent posts but know how new forum members can be a pain in the arse will topics that have been beaten to death already. Any advice or information that will help me let the bike perform to it's full potential without sacrificing too much reliability will be greatly appreciated.
Thanks
Steve
Redondo Beach, CA
1995 MC28
1995 TZ250
2001 R1
RVF400, Honda RS250 and ZXR250/400 are the "common" USD fork swaps, none are straight swaps though.
Ohlins and Maxton both do rear shocks but if your bike is an se or sp both the front and rear were once good units and someone like K-tech (but closer to you??) will rework them for very little money compared to what you'd spend on aftermarket stuff.
Yes, the stock card does work after the wiresplice, you lose the speedo, mileage reading, oil warning light and neutral light with the HRC card in, you still lose the oil and neutral lights with the Honda card back in and the wiresplice done. Mileage doesn't go up with the HRC card in.
Not the ignition but the mc21 flywheel offers more advanced timing. I would normally say do not use one with the HRC card full stop but as you've got a TZ I guess your pretty familiar with the way a 2 stroke works so I'll just say the '28 was further restricted by retarding the timing (compared to the '21). This can be "fixed" by either the HRC card or the '21 flywheel. Doing both could be disaster on normal 95 ron pump fuel.
The HRC card is the prefered way as it totally derestricts the ignition, removes the rev limiter etc.
The airbox can be modded with a couple of holes in the lid about 1" across.
Obviously the jetting will need checking.
You'll find with all this done and running well the standard gearing is too short. I've just got 16/39 for mine (std is 15/43) but not tried it yet as it died again.
There aren't many '28s about and even less people modding them so nothing about them gets "done to death" on here. _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
ERM...
The jetting for a stock card used on a bike set up for an HRC card will be miles out.
Or at least mine was - do check it please. _________________
I'm always amazed with the knowledge base available from various forums. Thanks for your replies and input. Being that the bike is an SP I guess I'll just have the stock suspenders rebuilt. Is the derestricting for the HRC card as easy as the Tuning section of the forum makes it out to be, a simple wire splice? I will probably mod the airbox at the same time and need to rejet, who offers a combination of jets. Is there a base line jet size for a bike with aftermarket exhaust, airbox mod and HRC card. I know every bike is different but I will be running mostly at sea level.
Yep, that's it, just earth those three other wires and it works.
Wow, jetting, well that's the real question isn't it?
You can go one of two ways, either just run bigger main jets or get the HRC jet kit and do it "properly". For the cost of the kit and the fact it does give you not only a good selection of jets but also the adjustable needles I don't see why you would mess about. Some people say the mid range is better with the power jets but mine is (was ) pretty good anyway.
I have no personal experience of running the bike without the HRC jet kit so can't help there but to show how hard it is to predict I do know of at least one bike (an '18 ) running leaner than standard jetting that gives over 60bhp, presumably as the Tyga pipes scavange better than the stock ones.
As for jetting advice all there is really is the HRC and JHA base settings which are for an open airbox, no oil pump and the jet kit fitted (which means no power jets). So I'm going to say you'll end up a fair bit below that (not an open air box and the oil pump in situ) so maybe start at 190/192 (190 on the top cylinder as it runs hotter and is therefore less efficient) and the middle of the b needle?
Please be very careful, do NOT do a plug chop for 10 seconds in 6th straight away, just do one up to about 12000rpm in 4th first, then 5th if it's ok etc. Set as above it should be well on the safe side anyway but..............
Andy, you wanna mod these numbers out mate please feel free, I know your feelings on the matter but you've got to start somewhere.
Or take it to a dyno and trust someone else
*The above post is not to be taken as gospel, I accept no responsability for any seizure and will not be paying for any replating other than my own, the fact mine needs doing at all may well indicate I have no idea what I'm talking about.
Oh yeah, and if '28's are supposed to stall when the side stand is put down and they're in gear (like the diesels do) the HRC card removes that too. _________________ Please do not PM me technical questions, if you can't find it on the Forum start a thread
fontyyy wrote:
*The above post is not to be taken as gospel, I accept no responsability for any seizure and will not be paying for any replating other than my own, the fact mine needs doing at all may well indicate I have no idea what I'm talking about.
nice! _________________ NSR300R - Why did i ever have a 250...
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You cannot download files in this forum