Was wondering if anyone here is running the Tyga 300 kit. Comments??
What is the actual displacement?? does the kit come with it's own powervalves?? what about spare piston and ring cost?? any help would be appreciated as I will soon have another MC28 on the way and sereously considering the kit. Thankyou.

I guess this would be me then....
It's grunty.
Too grunty some might say....
[You lose some [all?] of that revvy 2-stroke thang]
No idea on displacement - ask Matt.
Yes it has it's own power valves...
And yeah, I ordered spare pistons, rings, and gaskets from Tyga at the same time:-
2 x TYGA 300cc Bigbore Piston Kit $110.00
1 x RC Valve Cable A $4.00
1 x RC Valve Cable B $4.00
1 x RC Valve Cable guide $5.00
2 x Gasket, Cylinder $8.00
4 x Gasket, Head $40.00
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Yep 300cc's here. I went with a little extra porting which I think helped with the rev out. Very nice fit and finish except my exhaust flang for my upper cylinder needed a little extra work. May have been my JHA pipes not sure there are the only ones I have. Performance wise Awesome! Great street motor tons more torque, can't keep the front wheel on the ground with street gearing. Widens the powerband a lot. Lost a piston first track day. My fault incorrect jetting and very cold temps 50F. New piston and rings $50. 6 track days later and I can't break it even with a 3400 foot straight. I've never delt with a more professional company either. Matt returns all my emails and does everything to help out. You can see that if you follow this site.There is no replacement for displacement!!!
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1995 A kit TZ 250
1994 Rothmans NSR 300sp SOLD
1998 RM 250 freestyle/motorcross
1998 Meathanol burning CR 500 AF super retard/motorcross/sand dunes/play bike

jkolewski wrote:Yep 300cc's here... There is no replacement for displacement!!!

Only a Yank would write that!

Seriously though, it's been debated at length on this Forum, and it's horses for courses. I have personally come to the conclusion that the majority of riders who try a 300 will love it, for all the reasons jkolewski says - you also get brand new genuine Honda barrels!

I myself love a screaming 250, but I'm a purist.
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Andy.
NSR-WORLD.COM

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Too grunty some might say....
[You lose some [all?] of that revvy 2-stroke thang]

It seems like everybody agrees to the above statement but looking at the dyno curve I can't see that. It revs out much higher than a standard and only looses about 300rpm on top compared to an unrestricted, but has a lot of extra power through the whole band and is even peaking steeper from 8500rpm, for the MC28 and MC21 the curve is almaost identical, but with more power.

So whats going on here ? The curves look mouthwatering





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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

The problem is as plain as day in the bottom curve, at 8000 rpm it's making 33% more power than a 250, yet at 11000 that figure is down to under 10%, it's the speed that the power rises that makes a stroker feel so good, ridden back to back it's nigh on impossible to believe my NSR and RVF are similarly quick or that a CBR600F is faster than either.

To feel like a 250 does while making that sort of mid range the 300 is going to have to make 80+bhp at the top.

Steve's 300 running the 39mm carbs felt like a quiet, light, slightly quicker RVF400 that ran out of revs too quickly.
It was mega quick and would be an awesome street or race bike, but if I wanted a mega quick awesome street or race bike I'd just buy a K6.
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I can't see that. Its just playing with numbers. Ok lowdown, there would be a big difference but the steepness of the curve is almost the same from 8500 and up, so the relative acceleration should be same here.

According to your theory, a 250HP bike should be docile as a diesel truck, because the percentual increase in power is much less than on a 65HP bike ??


MATT, couldn't a chamber made for the 300cc kit be tuned to max HP at 9000-12000 and thus give us higher HP at that range at the expense of torque lower down ?

You only need torque when plowing anyway, who needs it on a bike,
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

Andy, you know were all obsessed with size over here. Have you ever seen a super-sized anything at Mcdonalds or the movie supersize me? I think with a little different porting and maybee some different pipes I can have a peaky 300 I love peaky.Nothing like hitting the throttle stops and rowing a gearbox around the track(or the street)
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1995 A kit TZ 250
1994 Rothmans NSR 300sp SOLD
1998 RM 250 freestyle/motorcross
1998 Meathanol burning CR 500 AF super retard/motorcross/sand dunes/play bike

Have you actually ridden a 300 Poul? If you haven't, then you won't understand why those of us that like the screamers don't like the 300 so much.

A graph can only tell you what the motor is doing at specific RPM, not what it physically "feels" like.

As I understand it, Matt's latest evolution 300 (I'm "trade marking" that Matt ) is making in the region of 80hp+ and I imagine that is some ride, but a "stock" 300 just has lost the 250's cutting edge. The NSR is already notable for it's bottom-end, and for me, strokers are all about the sexy peaks on top, not a fat girly bottom!
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Andy.
NSR-WORLD.COM

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fontyyy wrote:ridden back to back it's nigh on impossible to believe my NSR and RVF are similarly quick or that a CBR600F is faster than either.

Steve's 300 running the 39mm carbs felt like a quiet, light, slightly quicker RVF400 that ran out of revs too quickly.

pbekkerh wrote:I can't see that. Its just playing with numbers.

No it's not, it's flat fact based on experience.
I have a 60+bhp 250, 65+bhp RVF400 and have ridden them both back to back with my mates CBR600 racebike and have ridden (and droppped ) Steve's 70+bhp 300.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

No I haven't ridden the 300cc, as it takes some 1200$ to do so, so I'm trying to get the facts right first.

Please understand that I'm asking questions, not because I doubt your experience ( that a guy goes back to 250, sounds pretty convincing) but rather to understand.
I believe theory and practice go hand in hand and I couldn't get the curves to confirm peoples experience.

Maybe we all should cheer Matt along, so he'll come up with the ultimate 80+ kit, with a such a peak that only Rossi can ride it.

And yes, I too love the kick from 9000rpm and up and don't care about street rideability. If I wanted a commuter, I can fall asleep on/in, I'd buy a diesel 4 wheel, automatic..
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

It seems adding the carbon reed give more bottom end but maybe lesser top end, and therefore not using carbon reeds may be a way to get the sudden power.
But i suppose more importantly is the mid-range to top end, for people who love to lean the bike low, I guess is good to have more mid-range than having more top end, this decrease the chance of slipping the rear too, but i suppose it also depends on how the rider ride his/her bike. I think the good thing about the MC28 is it natually seems to have more mid-range, so it seems to corner out better than other 2-strokes250, but the powerband is less suprising. However some people might just love that suprise peak and I do too, but so far I think for best performance I rather lost some peak for extra mid-range. This might change if one day I start to ride real hard.
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MC28, Repsol

Poul,What the 300 feels like to me is(I have ridden Stephens as well) when it getts to 9,000 rpm the power starts to drop off ,if you look at the middle graph the green line starts to drop off but on the blue it starts to get steeper at 10'000rpm,now it might not look much on paper but its very noticeable when you ride both.To make the 300 feel like a 250 it would need to make 80 bhp at 11'000 rpm then the line from 50bhp/9'000rpm to 80bhp/ 11'000 would look as steap as the 250 line.In fact the difference feels a restricted 45bhp NSR against a pull power 60bhp NSR were the restricted ones drops off at 9'000rpm.

I see now. With the same steepness of the curve, the 71 HP engine has a lower increase in HP/1000rpm than the 65 hp engine, so its not so peaky, but must still be faster.
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

Oh yes, it's a tonne faster than the average 250 mainly due to that big ol' mid range lump as it's useability, not outright power is king if we're on about speed, laptimes etc.
Basically the 300 rider has got another 800 rev's of leyway to allow him to get a gear wrong, or change at a more appropriate time and he's got between 6 and 10 bhp more on tap if he gets it right.
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