G'day Went for a bit of a run on my old dog of an nsr250 mc16 yesterday, about a 100 miles with some mates, all on poncy 600's and my lady on her nc30..

In between parking up and waiting for the rest of them to catch up (seriously..) I was having a little bit of fun with the old smoker on the twisty welsh roads, as one does and aside from the horribly soggy suspension I noticed that she vibes like hell when at high revs, and is generally quite harsh especially when compared to my seized-on-the-way-back-from-the-mot rgv. Is this right? I had heard they were a bit 'raw' but am quite suprised how much it is.

Think every thing is in order, engine aint moving around and the crank 'sounds' ok from the outside. Whats a crank rebuild cost anyhoo? Are they a costly job?

Thanks
PT

The 16`s have solid engine mounts, no power sapping rubber mounts! That must make a difference.

2Smoke wrote:
...aside from the horribly soggy suspension I noticed that she vibes like hell when at high revs, and is generally quite harsh especially when compared to my seized-on-the-way-back-from-the-mot rgv.

...engine aint moving around...

That'll be because it's solidly mounted, like the RS. If it's moving about in the frame you have problems!

It may also be the reason it feels a bit harsh, especially if you modify it at all with MC18 barrels/carbs/pipes/ignition etc., as you'll be putting another 15hp or so through the chassis.
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Andy.
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Phew.. I'll treat it to some tyres then, the 10 year old rubber thats fitted made for some interesting cornering yesterday!

Are the cranks hideously expensive to recondition like the later models? Just in case like ...

[The 16`s have solid engine mounts, no power sapping rubber mounts! ]
Just out of interest, please explain chester. Always looking to kick out power sapping things.

If you have solid engine mounts, there's nowhere for the power to go but through the chain. With rubber mounts some of the engines power is absorbed as the motor twists in the chassis.

Think of walloping your thumb with a steel or copper hammer, and then a rubber one... sure, the rubber one will transfer enough energy to hurt, but not as much as the metal one, as the flex in the rubber will absorb some of the impact!

HRC engine mounts that are made from a stiffer rubber compound can be used on later bikes, or even better results can be had by turning up solid nylon mounts, but that's when the harshness starts to set in. The MC18, '21 and '28 all have a "torque link" between the motor and the swingarm too, to help reduce twist, but the MC16 doesn't need one because of the solid mounts.
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Andy.
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So now i need to order some special engine mounts to beat Deon