In true last minute style I've decided it's time I sort out the 18 I bought off Si.

It's going to be my track bike and I've not touched it since I picked it up having booked a trackday for next Tuesday.

I think it's a MK1 but I'm not 100% sure. regardless of what it is what simple quick mods will improve it?

the F3 linkage is the obvious one and looking at the tech section theres just 1 bullet connector to pull to unleash some more ponies.

Does the 18 benefit from holes in the airbox like the 21?

Pic below. (I've seen that little of it since picking it up it's a pic Si sent me. )


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If you dont like the way that i ride.....Stop trying to keep up!!!!!

Model: R2J

Quick/simple mods: F3 shock linkage, drop the front-end about 10mm, pull the black/blue bullet connector by the back light, and 4 x 20mm holes in the airbox, clean the air filter and dry it out.

Should have around 61hp, a nice crackly exhaust, and pretty sweet handling if the suspension is in good condition.
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Andy.
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Thanks Andy.
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If you dont like the way that i ride.....Stop trying to keep up!!!!!

its nice to see you doing something with the old girl the only thing we did to her was 1 tooth lower sprocket and handles well enough to scrape the fairing and the side stand
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ive seen more tarts than mr kipling

Si has anything else been done to it or is it just the sprocket?

There's a brand new pair of 090's, some spark plugs and a pair of fork seals winging their way to me and fingers crossed that's all I'll need for it to go well enough by tuesday.
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If you dont like the way that i ride.....Stop trying to keep up!!!!!

Look what I've just found.



It would appear that the power valves have been wired open.

Should this just be a case of undoing the bullet connector near the rear light and away we go or could wiring the servo in this manner caused other problems?
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If you dont like the way that i ride.....Stop trying to keep up!!!!!

jesus christ mate no we never had cause to strip it my bro got it from martyns motorcycles in mansfield.i feel a bit of an arse now for selling you summat with a proper bodge like that
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ive seen more tarts than mr kipling

No worries mate. You pay your money you take your chances.

I'll remove it and see if things do what their supposed to.
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If you dont like the way that i ride.....Stop trying to keep up!!!!!

cheers mate and it always ran well and was pretty quick
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ive seen more tarts than mr kipling

I didn't know HRC did an adjustable RC Valve return system!
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Andy.
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Well after running the bike up today with the spring taken off there is no movement from the powervalve servo at all. I was expecting some movement between 2-3k like the 21 does. Am I right in thinking that?

Assuming something has popped due to the servo being wired open is it likely to be the servo or something else?

Most likely a dead RC servo controller. It's a separate unit on the Mk1, much like the MC16, and looks almost like a third CDI.



RC control circuits die usually due to poor maintenance. Check the RC Valves operate freely by hand, and remove/clean then as necessary.
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Andy.
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I'll run it as is on Tuesday and hope I can keep it in the power and then investigate further at a later time.

Andy you say RC curcuits fail due to poor maintanence, I would assume wiring the valves open would amount to the same thing.
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If you dont like the way that i ride.....Stop trying to keep up!!!!!

not sure if its possible mick but you mite be able to fit rs125 cylinders as thay have no rc valves

Anything that causes a strain on the RC servo can burn out the control circuit. The most common causes are tight cables and excessive carbon build up on the Valves.

I've ridden an MC18 Mk1 with the RC Valves pinned open (with an Eric Gorr port job) and it didn't actually run too bad!
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Andy.
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