I stripped my MC28SE down to clean repair and to add a few bits to let the engine gain some BHP.

I Put it all back together and now it will not rev past 4k under load, unless I open the throttle fully and then it will only go to 9,500-10,000.

I replaced the std Reed valves and std stuffers with tyga reed blocks and stuffers and fitted some AKTIVE Carbon Reeds.

I also Modified the airbox lid as per the TYGA pictures.

It's Running Standard Pipes and silencers, as I have been waiting 3 MONTHS now for my pipes from TYGA !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

YEP thats right 3 MONTHS...........................

The MC28 Flywheel has beeen replaced with a MC21 Flywheel.

Replaced my damaged Carbs with some mint ones I got from Japan.
These have been checked over and have std jetting and needles etc in them.

And that’s about it.

Bike starts easily and idles and will blip to 10k without any problem on the stand.

It feels and sounds really richwhen ridden, but it has std carb settings and the problem is with both sets of carbs.

I have checked all the electrical connections and did not touch the power valves or the wiring for them on purpose.

Before I stripped it will quite happily rev to 10k in the bottom 4 gears. ( this was as far as I pushed it)

Any idea’s…. I am stumped

Cheers Rob

It’s also worth noting that when I was searching for faults that I noticed that all the rubber pipes from the solenoids and air valves has started splitting and perishing. These pipes will all do it in time.

This would cause some serious air leaks in time and i would imagine also upset the running of the bike.

The next time your under the tank it might well be worth having a look at the condition of your own and replace the pipes.


I have NOT done this yet, in case it adds to my problems, but I thought I would bring it to your attention.

Does anyone know if its ok just to use some silicone pipe to replace the original Honda Stuff

Cheers Rob

I was going to guess air leak, until I read post two! If there's a split in any of those pipes, it's almost certainly drawing air and leaning off the mixture. Blipping the motor will be no problem, but under load it's a recipe for disaster! I've NEVER seen any of these pipes perish before. I would be inclined to think that they have come into contact with something (a cleaning agent maybe) that has reacted with the rubber. The only problem I have ever had was a fuel hose from the carbs to the tank, where it was a little loose at the union on the carb.

I would replace any split air corrector pipework (can't see any problem using silicone hose asa long as the seal is tight), check the inlet manifold is torqued down correctly, and that the carbs are seated properly and tightly clamped in the manifold. I'm assuming you used a new gasket on the crankcase side of the reed cages?
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Andy.
NSR-WORLD.COM

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