heya guys. i have a mc28 fitted with chambers, stock airbox without filter, 152 mjs and i am currently running a 030 card.

have a problem thou, when at 5th and 6th gear, my rpm is only limited to 11,000 rpms. i definately have enough power to pull the bike at that kinda rpm, but just when the rpm needle hits exactly 11,000 rpm, it seems that something cuts power to my bike and the rpm drops all the way down. the power will come back a sec later, but i can never rev past 11k at 5th and 6th gear.

i kinda heard with the 030 (hrc) card, you can rev till 13krpm? its kinda weird having this powercut because my display is showing p030/ctemp just fine (im using a modded harness, not the hrc one). the powercut for the mc28 is at the speed reading right?

any views on this? thanks in adv guys

If it revs out ok in the first 4 gears and only suffers in 5 and 6th then I would be looking at either the GPS or the GPS splice.
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I'm not so sure this is entirley relevent, but when I dyno'd my bike using the HRC card I got the bloke to overlay it on the standard card's graph. It showed that whilst the HRC card gave more power, and delivered in a more aggresive manner, it didn't rev out as far. Once the revs reached 11.5K they dropped off rapidly. The std card had much better over-rev.

Leigh might post a recent graph of his MC28 which shows pretty much the samething.

I might post the graph of my MC28, but noone believes it..or at least they wont admit the MC28 can put out this much power!!!


Last edited by watfordhorn on Sat Sep 30, 2006 11:08 am; edited 1 time in total

Here we go again...


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Andy.
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I am not going into this again either....I am still bruised from last time.

GPS huh?

okay i'll go check it out at the bike shop again i suppose. its kinda weird, but we dont know whats wrong with it.

just curious, how much can the mc28 with 030 card rev up till anyway? anyone knows exactly? racer38, i actually heard of ppl going up till almost 13k rpm with the 030 card also. i dont think it can be that much of a difference right? loss of 2k rpm! oh my.


maybe i'll just go ahead and install the whole new hrc wiring harness if nothing works


thanks again guys!

It'll rev forever, there is no limiter (well not one to concern us anyway), mine (on an 030 card) produces max power around 11200 - 11500 and really drops off a spot past 12000, which is more like 13000 on the rev counter........


'18's and '21's are no different, if anything the '28 over revs better.


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It shouldn't cut out.

Just out of interest, what plugs are you running?

I've seen a fair few MC28 with high gear, high rpm cut out problems when the plugs are non resistor type.

Stephen's gone a bit wonky with his GPS splice suggestion. On every 28 I've ever seen the GPS only registers neutral.

GPS splice?
For christ's sake, what is this? The dark ages?
Pull the "GPS wire" (it's called a neutral switch on modern NSRs) off if you want and place it in the bin, with the HRC card it does nothing as you've stopped the signal from it doing the 030 card splice and there's no where to plug it into on the HRC loom either.

There's something breaking down under high load, an HRC carded PGM4 has no idea what gear you're in or how fast you're going, it can't have, there is no GPS or speedo signal coming in.

RavenSP, there wasn't a speed restriction on the '28, it's megre 40bhp isn't enough power to require one, it was only geared for 115mph at 12000rpm in top and it can barely get there, job done as far as Honda were concerned.
By comparision a std '21 will do 125mph in top presuming it has enough mojo to get there, thus it needed some kind of speed restriction. Rather than a hard cut off (like the 400's got) the '21's got their power wound down by retarding the timing in the higher gears, hence the GPS splice to "fool" the PGM into always thinking it's in 3rd.
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Well, it took 3 days for someone to pick you up on it Steve... bet you thought you'd got away with that one!!
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I spotted it but was going to let it slide as I want his '28 tank for reasonable £££.
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That was supposed to be for the racer!!
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Chester362's got one spare, I'll buy it for you and deliver it IF Mr Teve will part with the '28 one for reasonable £££.

In fact if the '28 one was destined for the racer anyway surely just the '21 one is a fair swap? The racer is a '21 I guess?

Fancy a beer or two in Plymouth some time soon? We could even have a little autum rideout (with a new tank )
Wayne????


Come on Chester, how much for the '21 tank, bearing in mind it's for the racer, I've got a 600 miles round journey to deliver it and trips to Plymouth always seem to hit the credit card pretty hard?

And sorry about the thread hijack ravenSP
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Yes, i made a small error in the gps... whoops..

As for tanks, I swaped my 21 tank with andy as he didnt want a 28 tank on the racer. I then got another tank so the 28 tank isnt for the racer so is up for grabs. Its yours though Fontyyy dont worry.
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