GPZ engine in an ER-5?

[MattShill]

Could it be done?

Since they engines are pretty much the same except for some of the internals would the GPZ engine just slot in? I realise you'd need to change the carbs and everything to go with, and probably change the exhaust to get the most out of the engine, and maybe upgrade the brakes to cope with the power, but would it be feasible to do a straight swap?

Not really considering it, just curious. Because it'd be damn cool.
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Living life in the second overtaking lane!

'98 Kwak ER-5

[feef]

They both use the EX500 engine, so I don't see why not.

should be simple enough.

a
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[TheDonUK]

It most likely COULD be done, but the question is why? Are you talking about a GPZ600 engine or another 500?. Either way i know the GPZ500 is one of the more nippy 500's... Bah you were just asking out of curiosity no point in me pissing on your fire ... go for it dude

[MattShill]

The GPZ 500 engine makes 60bhp to the ER5's 50bhp, and it's black. That's about it!

The idea of messing around with it and gaining 10 horses is appealing, and sticking a sports (well, I say sports) engine in a naked commuter sounds a laugh, but it'd be a lot of work for not much real gain. It'd kill the resale value too, I may as well just paint it black and say I switched the engine!

Still, would be fun, might give it a go one day.
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Living life in the second overtaking lane!

'98 Kwak ER-5

[Itchy]

Stink recently put a GPZ500 engine into a KLE500 , since the KLE shares engine with the ER5 then its entirely possible.

however phanny says this:

to change a ER5 engine to a GPZ engine , all you need to do is:

get new carbs , put in a new CDI,

stripping those off a GPZ500 engine and sticking it on your ER5 I suspect would be much easier than doing an engine transplant which even stink (which is he can't fix it nobody can) has some issues and doubts about (though he managed to do it sucessfully).
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[extreme3d]

[instigator]

[ram_doom]

You need a high revving 400 engine in there
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TL1000s, KDX200

[MattShill]

Fair point about the insurance, it'd have to be either expensive or illegal. If it was the admiration of the biking community I was after I wouldn't have got an ER in the first place, I just like the idea of messing about with my bike to get some extra performance.

At the moment I'm relying too much on my bike to have it in pieces in the garage for weeks and I don't have the cash to invest. I reckon I'll keep it stock until I've finished uni, by which time it'll hardly be worth anything anyway, then get a new bike and see if I can knock together an ERZ-500 .
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Living life in the second overtaking lane!

'98 Kwak ER-5

[phantomtek]

[phantomtek]

Here's a link to the engine, £1 and no reserve, think it used to have a buy it now price until somebody bid.

Click here!

[stinkwheel]

I put a GPZ engine in my KLE500 (which as said, has the same motor as the ER5). Transferred over the whole kit and caboodle. Engine, carbs and CDI.

Ran like a bogowank. The reason being the KLE airbox is half the size of the GPZ one, this is all it can be, everything else is pure GPZ, straight swap over from one of my old ones.

As is, I have the GPZ engine on the KLE carbs. Goes better but not quite the flying machine I expected. Research continues.

As for the insurance thing. The only externally obvious difference is that the GPZ one is black and the ER5 one is grey. They both even have the same type of engine serial number (EX500****) so your chances of being caught are slight.

There is another possible issue. I THINK the ER5 gearshift works the opposite way round to the GPZ one. MikeH has a wierd, non standard gear shift lever on his KLE that works back to front. We kind of came to the conclusion that someone has replaced the engine with an ER5 one at some point in the bikes past.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Itchy]

I didn't follow stinks post about the GPZ engine in KLE too closely , though.

I've always dreamed of doing up an old rat bike but modding it so it has some harsh performance , say an RGV250 engine in a lightened GS500 or something (different config parralell 2 vs V2) , and messing with the heads of some super wealthy super sports bike riders round here , there must be at least 5 busas and lots of ZX10Rs
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Spain 2008France 2007Big one 2009 We all die. The goal isn't to live forever, the goal is to create something that will. In the end, your life will flash before your eyes. Make sure it is worth watching.

[proximity]

[Nath]

[extreme3d]

[proximity]

I still don't understand what you are getting at. The GPZ CDI will have a different advance / retard curve to the ER5, causing it to spark at a slightly different point in the cycle, not the wrong point. This is what gives the GPZ the extra power along with the cams to match.
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2004 Aprilia Tuono

[stinkwheel]

[phantomtek]

In what way would you think it will affect the resale value of the bike? In theory if I changed over the engines could I custom mount a GPZ twin can system to the bike?

I don't think I ever will I'm just interested in the whole subject of engine swapping.

[stinkwheel]

I would imagine one would fit as is. Changing the engine doesn't affect the position of the exhaust ports, the external dimensions of the two engines are identical. You might need to make a hanger for the end cans.

You wouldn't want to anyway. The standard GPZ exhausts are made of purest shite and rot away before your very eyes. That's why any GPZ you will see that has any serious mileage on it is fitted with a Motad 2-1 system.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[phantomtek]

[proximity]

God help me, im putting a GPX 600 engine in my zephyr soon. I'll have it up on show and tell.
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2004 Aprilia Tuono

[extreme3d]

[proximity]

Well if thats right then the engine has constant timing throughout the rev range because the 'hall sensor' is fixed.
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2004 Aprilia Tuono

[stinkwheel]