Will a CBR 400 engine fit on a YFZ 450?

Stav450 · L Plate Warrior Joined: 31 Jan 2016 Karma :

Hey guys, I have a yfz450 with no engine and I've been looking for an engine that would fit in it without too much adjustment modifications.

I found a CBR 400 engine and I would love any information if it would be possible to place it in my yfz.

Thank you in advance.

c_dug · Super Spammer Joined: 04 Sep 2007 Karma :

You'll make almost any engine fit with enough work.

That said I wouldn't suggest it, the weight difference alone between the original 450 single and the cbr4 engine would be enough to put me off, and I've no idea why you'd want to either to be honest, I'm not sure a revvy 400 suits an MX frame for any use.
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Old Git Racing · World Chat Champion Joined: 08 Aug 2009 Karma :

Think you might have a slight problem with the chain run unless you offset the engine about 3 cylinders worth. Doh!

OGR
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MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Lots of things can be made to fit, but this is less 'made to fit' than 'completely re-engineer the frame to the point where you might has well have not bothered'.

a single cylinder MX engine is very narrow. A 4 cylinder across the frame engine is wide. I don't think any more than that needs to be said really.

Is it school holidays or something today? Rolling Eyes

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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

Ste · Not Work Safe Joined: 01 Sep 2002 Karma :

With just an angle grinder and a sledge hammer, it'll fit no problems. Thumbs Up

Kaya75 · Trackday Trickster Joined: 11 Jan 2015 Karma :

Considering the question in another light, "can I plug and play cb400 engine?".. No

"Can I build a custom bike from a yzf and cb400?" Yes, but if you need to ask here then don't try to. It'll cost more time and money then a new bike if not two bikes. Surely you can pick up a yzf engine?

Goodluck Smile

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Kaya75 · Trackday Trickster Joined: 11 Jan 2015 Karma :

stevo as b4 · World Chat Champion Joined: 17 Jul 2003 Karma :

Would like to see it though if you do?

I've seen a Kawasaki KMX125 with a Bandit 400 engine fitted once, years ago in a magazine (might have been Streetfighers), but I don't know how it handled?

I think it's a shame that no manufacturer has built a fairly light street moto (cant call them supermoto's as G doesn't like the term for road biased bikes), but with say an R6 engine fitted?

It would be no heavier than something like a Ducati Hyermotard 800 or similar, but have smooth revvy delivery and with much shorter gearing than the engine would have in a sports bike.

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

YFZ is a quad, which probably makes the whole thing ten times harder.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

c_dug · Super Spammer Joined: 04 Sep 2007 Karma :

Hadn't noticed that, read it as YZF both times!
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stevo as b4 · World Chat Champion Joined: 17 Jul 2003 Karma :

Oops, I failed!

Well you don't want a CBR400 motor in a quad I would suggest anyway.

I remember driving home last summer from Aston Birmingham and at a set of lights hearing some sort of grunty loud superbike coming up the outside, or so I thought. It was two black dudes wearing bandanas on quads, with what looked like car tyres on. The first bike I reckon had a bandit 600 engine in, well a silver SACS lump anyway. The second even louder more menacing one had a ZZR11 lump shoehorned in with a shorty can. Neither of them hung around when the lights changed anyway. Laughing

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Shaft · World Chat Champion Joined: 27 Dec 2010 Karma :

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Shaft · World Chat Champion Joined: 27 Dec 2010 Karma :

Stav450 · L Plate Warrior Joined: 31 Jan 2016 Karma :

Hey guys, thanks for all the help I appreciate it but I finally decided Im not going down that road. Best choice for me personally is to find a yfz or yzf engine, fix it as it is intended to be.

Then sell it, and buy a Raptor 700 which is more suitable for road use anyway and if I decide I want to throw an r6 engine in the Raptor then it would be a little bit easier I believe.