I have modified my VHM heads, and am doing another two sets now for two other 300 engines I'm building.

They are of course NSR150 VHM heads but for the front head to work properly we must change the spigot position.

If the heads are ordered for the 300 kit (not for the NSR150SP), then the heads will be supplied ready to bolt on, with the insert that I've got fitted now, which is for 95ULG. Throttle response is instant and power is immense.

Other inserts that VHM have machined for me are for 100LL avgas, 108 oct. ULG race fuel and we're now designing for VP C-16. They'll make any insert I want if I ask them nicely

I'll post the weights and comparisons up tomorrow.

I use Shell 98... Is there one for that?
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NSR300R - Why did i ever have a 250...

As I said, they'll make me any head insert I want.

The insert volume I'll use on the 300 kit isn't fixed in stone yet as I'll be able to have a play on the dyno.

I've got 98 ULG fuel here too if needed, so I can give that a run up to get a base.

Nice. And looking forward to those piston weights... Never been too happy with the extra mass on the 300 kit pistons purely for crank/rod kindness, so I'd be right on your tail for some lightweight ones!
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NSR300R - Why did i ever have a 250...

Hey Maxim, I just had the quote from Wiseco.

I hope that you're sitting down.

Oh I'll keep you in suspense until I can give you the weights tomorrow. I don't want to depress you without a pick me up to go with it.

Heres what I posted in another post aaaages go...

All figures are piston complete with rings, wrist pin and circlips

HRC F3 piston : 162g (no it wont fit a stock crank)
MC21/28 piston : 201g
Tyga 300 piston : 227g (yes it will fit your stock crank, no it wont fit your stock bore).
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If I have to take the carbs off once more...

Matt@TYGA wrote:Hey Maxim, I just had the quote from Wiseco.

I hope that you're sitting down.

Oh I'll keep you in suspense until I can give you the weights tomorrow. I don't want to depress you without a pick me up to go with it.

How annoying are you today!!?

If they're lighter than stock I'd pay more than a tenner for them that's for sure...

Cheers Stephen. The 300 piston isn't as heavy as I thought in comparison. Be nice if it was 150g though!
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NSR300R - Why did i ever have a 250...

Looking back though my emails to and from Matt the pistons in his 300 are 190.4g (I don't know if this is with rings pin and circlip though). I think these were one offs so proddie ones might be a tad heavier. Its still a good saving over the "stock" Tyga pistons though.

Sorry Maxim but you arnt ever going to beat a F3, you might get more hp and more torque but it aint no F3
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If I have to take the carbs off once more...

Lol Stevie, shout that to me as I come past you on the back wheel shakin my booty at you!
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NSR300R - Why did i ever have a 250...

Is that in the same dream where you get 78bhp?
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If I have to take the carbs off once more...

Hmm... just comparing spec's between the F3 and the TYGA 300, and it's far from cut and dried!

I've uploaded all the images, but I will edit the Posers league table before I publish the URL!

I hope to have a minor update done later tonight... who'll be in the lead now though?!
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Andy.
NSR-WORLD.COM

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When you compare the F3 and my 300 specs there's advantages for both bikes.

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.

As usual, I'm a step behind the rest of the world. NSR-World that is!

Steve just sent me a SMS telling me that I was trying to get a square peg in a round hole....usual story. It should have been the 89 RS crank that drops straight in, not the '92 as I was trying.

He probably told me this back then but I doubt that I was probably too excited to take any notice.

BEEP.....

Another message from Steve.

Glad to see that my bike's back where it belongs on the Poser League

Bit of a worry about Steve though not being too far behind

How many points did you give him for that water pump cover Andy?

Hey, don't forget my shirt when you come over, I need a buffer

How come I am still bottom (except Andys MC21 which isnt calculated properly either).

My aim for last year was to get off the bottom, now seems that my NSR is destined for the same league position as my poxy football team.....bottom!

Surely with my extra points I have added I can go up a bit, expecially as thats the only reason I splashed out on the new NSR world brake lines.