Will NF5 heads fit the standard MC18 barrells and if they do is it really worth the expense and agro?

Have you seen NF5 heads?
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Andy.
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Not close up, does that mean they are miles of then?

They are round for a start!
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Andy.
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Only got a rough phone camera pic sent to me , could have been triangular for all i could make out! I am a NSR noob though i my defence. I did read something about changing the heads so the plug was more central but couldn't remember what it was. Thanks for the advice as always

hutch wrote:
Only got a rough phone camera pic sent to me...

Don't get me started on the invention of Satan!

MC18 heads are pretty good already... although you can use a rear on the front, just like with the MC21 and MC28, if you wish.
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Andy.
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Not much wrong with MC18 heads as Andy says.

I had RS barrels and heads on one of my motors for a while. It was nice having the O rings but I wouldn't have them over a good set of NSR barrels.
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If I have to take the carbs off once more...

There are a few things that, on paper, make the RS barrels and heads look way ahead of NSR ones including:

• O-ring heads
  
  
• True centre-mounted spark plugs
  
  
• RC Valve design and adjustment

But when you can get the same power from NSR components it kind of makes it hard to justify the expense and hassle of fitting the RS parts. The NF5 RC Valve setup is a pain in the ass on an NSR as it needs all the actuation linkages and control cables for example, and the deck heights are wrong too, as the barrels are designed for the shorter single-ring HRC pistons (and usually AVGAS).

Waaaaaay better off modifying the NSR barrels and heads unless you have the time, knowledge, experience, and facilities to make use of the RS parts. Even then, NOTHING so far can reliably beat well modified original HRC spec 90~91 NSR250 barrels!
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Andy.
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Last edited by Andy on Fri Jan 23, 2009 9:30 pm; edited 2 times in total

Ahh thats what it was. Rear on the front , luckily i have a spare set of 18 heads

I have to admit its cool having RS barrels though. They are after all from a GP bike!
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If I have to take the carbs off once more...

how hard is it to fit rs barrals what are the differences

The RS barrels themselves just bolt on.
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its the deck height thats different. Hence the NF5 of NSR F3 crank and pistons.

How would NX5 pistons work? Whats the deck height bizzo there?
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The Chopster