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  #1  
Old 22-04-2013
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Pros and cons of riding MX bikes compared to enduro bikes in bush and enduro racing?

Pretty sure it's been done before but I can't find it.

Talking about 2t and 4t

Rode my 125 on the weekend with suspension set up for MX and was pretty happy with the way it handled and how I could flick it around. Could tap the back brake, slide and lay it right over into corners and it felt natural. A feeling that I haven't really experienced before. I like the way it tracked through braking bumps and whoops. Didn't soak up the square edge bumps all that well though. Sent me over the hangers on one occasion. It was tiring on the arms to ride though as it required a lot of clutch and throttle input and precise gear selection. Any slight Incline and it struggled. I found myself shifting down 3 gears just to get it moving again.

So.

MX Pros:
Lighter
Cheaper to buy

Cons:
No electric start but there are some models out with that are electric start.
Close range gear box ratio
Not fully road registerable but I don't care about that cause I can rec reg it.
No side stand

Explain to me:
No fly wheel weight but I'm not sure why it's a negative? I don't understand exactly what it does.
19 inch wheel, not sure why this is a negative either.

Plenty i have missed im sure so what other pros and cons am I missing?
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  #2  
Old 22-04-2013
wardy122 wardy122 is offline
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Pros and cons of riding MX bikes compared to enduro bikes in bush and enduro ...

Flywheel weights just basically weigh down the reciprocating mass a bit. Smoothing the power band out, makes the bike less peaky. More tractable in slippery conditions, hill climbs etc

19" wheel vs 18"... I haven't really thought of that, only thing I can think of is the 18" offers more sidewall on the tyre, can run slightly lower pressures, less prone to pinch flats. Offer a slightly smoother ride? I'm not sure

Another pro is the weight.. Another con, as you have found out is the initial part of the suspension is quite harsh, and is generally stiffer right through the stroke
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  #3  
Old 22-04-2013
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Quote:
Originally Posted by wardy122 View Post
Another pro is the weight.. Another con, as you have found out is the initial part of the suspension is quite harsh, and is generally stiffer right through the stroke
Can be tuned though so not to much of a con
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  #4  
Old 22-04-2013
ian9toes ian9toes is offline
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Less flywheel weight will allow it to rev out quicker. But won't resist stalling as well. I've never played with flywheel weights, but that's what I've read.

Apparently 19 inch wheels corner better, but the 18 will hook up better on rocks and tree roots, because of the higher side walls having more give.

I think your comparing a 125 with a 300, as much as you're comparing an MX'er to an enduro bike.
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  #5  
Old 22-04-2013
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Hard, fast aggressive riding in the bush is often best on an MXer.
Get tired/ride some gnarly stuff, and you realise that manufacturers aren't complete fools for speccing enduro bikes the way that do.

19" wheel is a bit more prone to flats and dented rims in the bush. 18s are better, but don't worry about it.

Extra Flywheel weight provides a bit of stall resistance, but is mostly about smoothing the hit. It will also slightly dull the throttle response, which is a good think in tricky/slimy spots. I prefer a FWW even on a 125 on a MX track.

Also:
Fuel tank size.
Too much HSCD.
Slow airfilter access.
Sharper/twitchier geometry.
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  #6  
Old 22-04-2013
ian9toes ian9toes is offline
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Quote:
Originally Posted by walks View Post
Can be tuned though so not to much of a con
Well you are comparing an MX'er with an enduro bike. So although you can make an MX'er into an enduro bike, that would be against your original post.

Unless you want to compare an MX'er tuned to be an enduro bike with a regular enduro bike, then there would be no pros and cons to discuss.

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Current bike: 2013 Berg 300. Previous: 2006 KTM 300, 2004 KTM 250 EXC, Husky TE 350, DT 200, KDX 200, XT 200, XR 80, XR 75, RM 50
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  #7  
Old 22-04-2013
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Walks, modern day enduro racing is pretty much natural terrain motocross.
As such motocross bike are often as good, if not better suited to the task.
General bush riding is an increasingly different story, a bike has to be versatile, easy to ride over long distances, have 100+k's of fuel range, good in very difficult terrain etc.
So enduro racing and general bush riding are very different categories.

As for the FWW, it has a few effects, however the magnitude of difference they make varies from bike to bike.

1. The increased weight means it takes longer for the engine to spin up when the throttle is opened, so it reduces the speed with which the engine responds to throttle changes (less snap off the trottle). Engine generally feels smoother and less powerful (even though it actually makes the same amount of power)
2. Because the engine doesn't speed up as quickly, it is less likely to break traction (both on opening and closing of throttle)
3. The extra momentum helps the engine to keep ticking over at low RPM so it's harder to stall
4. A heavy fly-wheel will generally reduce pull at high rpm. I'm not sure exactly why but my theory is that when the weight is spinning really fast there is a lot of energy stored in it so it's harder to change it's speed.
5. The additional gyroscopic effect will make the bike more stable when the engine is revving -and less maneuverable.
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  #8  
Old 22-04-2013
mat_p mat_p is offline
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I had a spin on a mates RM250 over the weekend...it's got me seriously scratching my head over how the hell people ride mx bikes in the bush...and that's purely on how harsh the suspension feels.
I'm not exactly a light weight rider, so I thought that my weight would have made the suspension a little softer but it felt like riding a concrete slab around compared to my exc-f.
Couple in the fact that I feel rather spoilt by having electric start and I was more than happy to give the RM back, lol.
I didn't find it any more "flickable" than my ktm, but I'd like to think that I can muscle a bike around quite well when needed, so I'm probably not the best judge on that.
I felt similar about the suspension etc on a mates race prepped yz450f as well...just too harsh in the bush, imo.
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Old 22-04-2013
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Owen how many Ks where you getting out of your 11 rmz in the bush?
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Old 22-04-2013
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Quote:
Originally Posted by mat_p View Post
I had a spin on a mates RM250 over the weekend...it's got me seriously scratching my head over how the hell people ride mx bikes in the bush...and that's purely on how harsh the suspension feels.
I'm not exactly a light weight rider, so I thought that my weight would have made the suspension a little softer but it felt like riding a concrete slab around compared to my exc-f.
Couple in the fact that I feel rather spoilt by having electric start and I was more than happy to give the RM back, lol.
I didn't find it any more "flickable" than my ktm, but I'd like to think that I can muscle a bike around quite well when needed, so I'm probably not the best judge on that.
I felt similar about the suspension etc on a mates race prepped yz450f as well...just too harsh in the bush, imo.
Yep. The YZ125 made me want to cry the first time I rode it (in the bush).
I was too fat for the stock springs, plus the MX spec dampening made it deflection city.
Add in too tall gearing for the hills at Mount Alfred, and a fairly snappy hit, and it wasn't much fun.

I fixed them all, but they needed to be fixed.
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