Formula 450 for NZ?

[scott411]

i think he struck problems after chasing horsepower once again tbc by him up until then it was a good bike, A modern standered fuel injected 450 should be pretty good the supermoto boys seem to do allgood on them and after having spent alot of time at motox i think the bikes recieve more a hiding there than they would on the road most of race they held bouncing of limiters they still wont be the cheapest tho but a good 2010 fuel injected yammy be around 7-8k roughly new piston in it make sure your changing oil etc should last you awhile the 450s are quite durable

motard is way harder on a the 450's than mx is, i know most of the top motard boys have had major blow ups on thier 450's, the long term high rpm running you get on a road race track is alot difference to short spurts on the rev limiter,

[Shaun]

motard is way harder on a the 450's than mx is, i know most of the top motard boys have had major blow ups on thier 450's, the long term high rpm running you get on a road race track is alot difference to short spurts on the rev limiter,

2 450 mx bikes converted for road racing blew up big time todayhere in ozzy bringing down 3 other riders in the oil

These motors are not designed for road racing rpm usage

[richban]

These motors are not designed for road racing rpm usage

I have heard this quite a few times on lots of threads. What bits are not designed for rev in these engine's specifically? Engines blow all the time for one reason of another. If people think they can bung an old used MX engine in a bike and go racing all day everyday then yeah sure, it might leave oil on the track and a dent in the wallet. There are ways to build engines and maintain them. Push the limit, find the weak point, and then fix it.

[scott411]

I have heard this quite a few times on lots of threads. What bits are not designed for rev in these engine's specifically? Engines blow all the time for one reason of another. If people think they can bung an old used MX engine in a bike and go racing all day everyday then yeah sure, it might leave oil on the track and a dent in the wallet. There are ways to build engines and maintain them. Push the limit, find the weak point, and then fix it.

mainly rods and valve trains that let go, esp rods on the 450's, on a mx track even the top pros do not rev them like you do on the long straights of a road race track, and with very close ratio gearboxes it is hard to get them geared any taller, when they let go they go big, and take cranks, barrell and cases with them, meaning expensive rebuilds,

120km/h is considered stupid fast on a mx track, (very rare to use top gear on a 450 mx bike on a mx track) where it is only a slow to medium speed corner on a road race track,

[RDjase]

Yea,

The black one at the vic club meetings is Scotty Moirs bike,RS125 chassis with CRF450 donk,Not really what we intended,Although a feild full of those would be cool as well

Is that bike the one that Brent Symes built?

[scott411]

I did look at building one of these a few years back, but there was a story linked posted on here about someone running one in the states, and the rebuilds it needed,

i would think you would be doing a rod at least once a year if you were doing a full national and club series season, and probably valves as well, these would not last many seasons with out regular maintainence,

The keep it standard idea is a good one, but MNZ has not has a great history of keeping these rules in check, although it seems to have improved a little bit recently when was the last time you saw a bike pulled down,

I am not going after anyone here but to put things into perspective, I race a speedway car, at the NZ champs when i qualified for the finals i had to present my car, without rocker covers, so they could check the valve gear which is restricted in my class, i also had to present my carb so it could be measured, they did that for all 20 cars that were qualifed for the finals, all 60 cars that turned up had to be weighed, and measured externally before you could start qualifing, (and my SNZ liceince is cheaper than my MNZ one before anyone asks)

[Billy]

Is that bike the one that Brent Symes built?

Yip,I'm pretty sure it is Brents bike

[RDjase]

Yip,I'm pretty sure it is Brents bike

That saves me trying to find Brent to see about it, he moved house and was overseas last time I tried to get hold hold him

[budda]

mainly rods and valve trains that let go, esp rods on the 450's, on a mx track even the top pros do not rev them like you do on the long straights of a road race track, and with very close ratio gearboxes it is hard to get them geared any taller, when they let go they go big, and take cranks, barrell and cases with them, meaning expensive rebuilds,

120km/h is considered stupid fast on a mx track, (very rare to use top gear on a 450 mx bike on a mx track) where it is only a slow to medium speed corner on a road race track,

And I think THAT is why the Yanks based their "new" bikes on the Enduro versions ( WRF, RMX, CRF-X etc etc ), to get the better gearbox internal and final drive ratios - Oh, and the electric legs aint a bad thing either !!!!!!

But lets face it, we do NOT have mega-long and ultra-fast tracks here in Godzone - best way to get a Kiwi to do something is tell him
it cant be done ..........

[Shorty_925]

That saves me trying to find Brent to see about it, he moved house and was overseas last time I tried to get hold hold him

He's around, playing bicycle polo.

[Shorty_925]

(and my SNZ liceince is cheaper than my MNZ one before anyone asks)

A work mate cant believe how much bikes cost in terms of licence & entry fees. Then again I cant believe how much meth his Super Saloon goes through in a race

[RDjase]

(and my SNZ liceince is cheaper than my MNZ one before anyone asks)

It should be, you only turn one way

[Shaun]

But lets face it, we do NOT have mega-long and ultra-fast tracks here in Godzone - best way to get a Kiwi to do something is tell him
it cant be done ..........

Sorry Budda, but all road race tracks are a shit load longer than mx streights

The swingarm angle on MX bikes is wrong for road racing use

The shock lingage is wrong for road use

MX bikes are built for the dirt, not for road racing

[budda]

Sorry Budda, but all road race tracks are a shit load longer than mx streights

The swingarm angle on MX bikes is wrong for road racing use

The shock lingage is wrong for road use

MX bikes are built for the dirt, not for road racing

How many of the bikes available new and used for road-racing in New Zealand ARE specifically designed and built for it Shaun ?

[SWERVE]

A work mate cant believe how much bikes cost in terms of licence & entry fees. Then again I cant believe how much meth his Super Saloon goes through in a race

And if you race cars such as speedway etc you get events every few weeks during the season that attract crowds of 3/400 + who pay $10+ a head to watch................. Spectator pays for the privalage of watching the racers.

We race bike where we get 5 events a year where spectators pay............... Racers pay for privalage of racing...... spectator gets a bargain!

Its all relevent............. look at the exposure/media/advertising a speedway event gets compared to us.
Plus the family can turn up..... purchase there evening meal (hot dogs) sit on their arse and see all the action.............. and out of workin hours when they are in "leisure time" mode.

Soon as we start running EVENTS not race meetings............. it may start to change..................... RANT OVER