Anyone got info on CR500 engines

[chris-red]

I have had a google but can't find anything, I'm looking for service intervals. etc.

Ta

Chris
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Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[Blau Zedong]

[chris-red]

CR500 mito sounded like such a good idea...
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[chris-red]

Can anyone suggest some decent MX/big singal engines to put in a mito? Need to be 45bhp+ and reliable within reason, i.e. be able to do at least 1000 miles between taking the engine apart.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[KLR600]

Could you not just save yourself a lot of work and get a Yamaha SZR660? TZR250 chassis with an XT660 engine in it. Ram_doom on here had one for a while and did a tour of Scotland on it so it must have been ok.
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[MarJay]

[chris-red]

[Kickstart]

[G]

How about a KTM380 EXC? They're not THAT uncommon and the EXC generally has longer service intervals listed as it's enduro.
As I've gone on about before, my 87 KTM 350 enduro I reckon would have an excellent 'characterful' engine for a road bike - no powervalve so a big hit as you got into the power band (while generally from what I've seen the CR500 is pretty flat - as it makes loads of low down grunt too.)
Oh and the CR500 is well known for shaking everything to bits - bike and rider. On a competition bike regularly serviced that's designed to hit 100mph over rough surfaces, it's not an issues - but can be more so for a road bike designed for a smooth engine to on tarmac.

I'd thought about such things in the past, but my current ambition in that area is something like my 200EXC in a Honda RS125 chassis I reckon. It's moderately reliable, but still got a big 'kick' feel as it comes into the powerband, which I like (not all 200s do, I almost wonder if mine has some SX setup).

Or you could just buy an SM converted 380EXC, which may well weigh less anyway .

[chris-red]

Hmmm

https://cgi.ebay.co.uk/ktm-640-lc4-engine-and-parts-/270701488740?pt=UK_Motorcycle_Parts&hash=item3f0710ea64#ht_500wt_1156


____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[G]

Remember the LC4 is a decent chunk heavier than the competition engines. My LC4 KTM weighs in at 138kg as stock - while a Husaberg 650 weighs in at 109kg or something.

[chris-red]

Weight vs reliablity, the KTM looks like a good choice compared to 10 minute piston changes

Even so a striped down Mito with an LC4 engine should still be Sub 140kg wet.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[G]

My 675 is 175kg with some fuel and everything else - and that's got a 675cc triple making over 100hp.

But, then I probably would have more fun on a 50hp single weighing 140kg.
Or you could just buy an RGV250 etc and go riding instead of sitting in the garage .

[chris-red]

It is more about the building of it, plus my mate already has the Mito and I have sourced an RS125 rearend for next to nothing so the chain is on the right side.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[stevo as b4]

I wouldn't want a 45bhp 200cc single 2stroke engine in a road bike TBH. G, i can imagine that your 200EXC feels like a big bore kitted 125SX to ride, but on a road bike with 100mph+ gearing, i don't reckon having a peaky powerbandy engine is the one really! As you say not all 200's have an exciting or sharp powerband. My KMX200 didn't feel that pokey compared to a 125 version, but then you notice that your going faster for less effort and not needing to change gear, so it's cool!

As for the CR500 engine, yes they are supposed to be quite vibey and not that civilised. But the stump pulling low end, and the flat delivery signing off at 6000rpm, would be far more interesting to me, than a peaky engine making the same numbers like an RGV250 lump for example.

I've always wanted to re-engine a light sports bike like a Mito, with a 300-330cc 2stroke trials engine instead! Your unlikey to top around 30bhp, but the delivery would be so interesting compared to a 30bhp 125, and i reckon it would be a stupid amount of fun to ride too. A big trials engine would probably be alot less vibey than an open class MX engine would too!

[G]

I personally like the peaky powerband for that feeling of 'working the bike'. Unfortunately it's my only KTM that I don't have a V5 for.
As I've mentioned elsewhere, one of my most for road rides due to the bike was my RS250 when it had a stuck powervalve (37.5hp on the dyno).

Have you tried any of the proper enduro 300s? All the modern-ish ones I've ridden (including my 99 KTM) I've ridden have very flat powerbands that are quite trials like. Ok, they make 50hp, but low down have really good pull for hill climbing and jut grip in nasty stuff etc. But if you're going for that sort of thing, similar from plenty of 'reliable' 4 strokes already out there to some degree.

[Damon]

Do it

Get yourself a cr500 engine and put into the mito frame, Will be a nutty bike.

I am doing something very similar project at the moment. Putting a KTM 500 MX engine into a RS125 frame

https://www.bikechatforums.com/viewtopic.php?t=212716

[colin1]

This kind of thing has been done on 125ccsportbikes forum. Someone there did it and they ended up getting cracks in the frame from vibration. Not sure what engine it was, but it was put into a 125 2 stroke frame. I cant remember if it actually snapped, but the guy was still riding it with the cracks that had developed.
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[Blau Zedong]

Don't do it. It'll fuck everything it's bolted to, that's if it doesn't fuck you first. Trust me, if you'd actually ridden a CR500 you wouldn't think "what a great roadbike this thing would make!".

[G]

There was someone that did post on here a bit that died when their bike hit the tree. It wasn't conclusive if the frame brake before after impact.
They had been told by multiple people on VD that it was a bad idea to put a CR500 engine in a 50cc chassis, but went ahead with it anyway. Little or no extra strengthening.
Obviously, to be fair, the 125cc chassis do tend to be a fair bit sturdier.