yzf engine fit

[haro504]

does anyone know if the 98 yzf600 engine fits the fzr easily

[shredex]

yes, all year yzf600 motors will work...but you also need the wire harness and cdi and carbs and airbox and stuff...

[shredex]

its better to do a 660 conversion which your just using the yzf600 heads and pistons and stuff and it gives you more HP than just a yzf600 motor...

[haro504]

but wouldent i still have the weak clutch and the 2nd gear or are they problems on the yzf motor

[haro504]

oh i never had a prob with 2nd just heard about it been riding bike 13 years never killed one just showed it whos boss. in your opinion is it worth changing the motors whats the hp gain

[haro504]

thats what i like to here i did the swinger swap and just got the front fork swap and now the engine for 250 bucks on ebay wont be able to use it right away cause i need everything else wiring and etc but the price is prety good to start with

[cad600]

its better to do a 660 conversion which your just using the yzf600 heads and pistons and stuff and it gives you more HP than just a yzf600 motor...

Shred, not everyone is interested in doing this. And it is not an easy thing to do. You also need to be fairly mechanically inclined to do this as it does get technical. Basically, this is more than a weekend build for the typical do it yourselfer. But a YZF600 engine can go into the FZR frame in about 2-3 hours.

The YZF engine is a great option as an upgrade. I would suggest looking for a set of 95-96 carbs to do this as the 97+ ram air system is a little bit of a pain in the ass to deal with.

[95FZR600]

I can honestly say, the 600 YZF will fit the FZR 400/600 frame. I have seen it. A little more HP to boot to.

[haro504]

ive rebuilt engines before and have every tool under the sun just a jack of all trades haha the only real question is do the rod bearings fit the fzr crank or do you have to change it with the yzf. im probally gonna just change the entire engine but im just interested and how much extra hp would you get

[cad600]

The stock FZR600 is rated at 90hp - A stock YZF600 is rated at 100hp. These numbers are listed as crank hp - subtract 10hp for wheel hp. The 660's I've seen have been dyno'd at about 107hp at the wheel. So it is a fairly good increase in power.

The normal way to do the 660 is to bolt on the YZF stuff to a FZR bottom end. Basically everything from the conrods up needs to be YZF.

[sparkles]

I have have a thundercat engine in my 1990 fzr6 fits in no problem and wired the cdi box for that engine in to the bikes wiring loom.

I didn't need to change the carbs but for the fzr carb rubbers to fit i had to turn them around and no carbs are slightly different angle that the air box wont fit so i suppose its some k & n filters

[95FZR600]

Engine swaps are a good thing.