The F3 scores heavily in the crank and piston department. The F3 crank is just so trick compared to the 'stock' indexed and trued crank in the 300. The F3 also gets top marks for the fact that the slugs weigh nothing, so will happily spin to 13k+ all day every day. The bigger Wiseco slugs (check Steve's weights which include rings, clips & pin) obviously have to have a ceiling on them, but are a good improvement over the 'stock' 300 pistons.
The NSR/RS hybrid clutch fitted to my 300 is about half a kilo lighter than the full NSR clutch on the F3, so I'd gain here. There was a fair bit of messing around making new push rods etc, but it's sorted now.
Both run F3 gear boxes so it's a split decision on that one.
Anyway, I think that this 300 mota is about as far as I can be bothered to go for now, apart from optimizing the heads and ignition and fuelling.
The next 300 engine I've got planned is gonna be the next step up, but as soon as I mention it here I know that Steve will forced back into the workshop with Andy hot on his heels brandishing the whip and chair.
Whilst Steve and I were talking b
ll x over a cup of tea, Steve mentioned that the NF5 crank dropped straight into the MC18 cases. Well, when Steve hopped on the plane back to Blighty I pulled the MC18 & NF5 motors apart and threw the crank at the 18 cases. Unfortunately it didn't drop straight in as the crank wheels are slightly larger in diameter, but bearings etc lined up nicely. Looks like a skim up in the cases is the next plan.
The NF5 crank is now next to the press, and I've got a selection of NSR rods on the bench. You see, the NF5 rods use a 14mm SE pin, but the 300 uses a 15mm pin.
Trouble is that once I've fitted the NSR rods to the RS crank I've then got to make a decision as to build either an NSR300MC18 with RS crank, or an RS300. Either way, they both have huge potential.
The RS300 jumps to the front when you look at the overal spec, and we know it'll go in the NSR chassis, but then it's not an NSR
So what to do?
Wish I didn't have to work for a living
Oh, almost forgot. Andy just sent me my poser points total for the 300. Looks like Mark Brown's factory bike is in real trouble.