woundering what you other guys are using for exhaust and how you like it i was thinking about trinity racing stage 5 exhaust for mine

 

Use the search please! Your gonna get about the same gains with the 700 as the pipes did for the 660's so you can search for 660 exhaust systems if your can't find topics on the 700. I'm also fairly sure that exhaust systems from the 660's will bolt straight up to the 700's...correct me if I'm wrong.

 

I dont believe the 660 exhuast will work on the 700, the 700 is a whole new motor

 

The engine isn't compeltly new and in fact it is very similar to the 660's, it looks very different though because of the newly redesigned cases. The only thing physically changed in the engine is the head which has been reduced to 5 valves, the cylinder sleeve and piston are slightly bigger, and the connecting rod has been improved, other than that the engine is unchanged. The only thing that could cause problems with bolting up is where the exhaust bolts to the frame because Yamaha made many more changes to the frame this year. Where the headpipe bolts to the head should be the same design, has anyone tried to bolt a 660 exhaust to a 700 yet?

 

First off the engine is different and not just slightly. There has been numerous changes to the incoperate the YFI, the head is way diifferent. RoostItUp it is not a 5 valve is it is a four. Also there is no way the sleeeve is bigger cause well the new rappy dont have one. Nic o line coating (im sure i got the name all wrong) go to atv scence and it show you all the engine differencees. It is by no means a remake it has been built from that ground up. I dont not suggest using a 660 exaust. The name may be the same but they really are 2 different machines.

 

Oops...I ment to say 4...my bad. The engine is still pretty much the same, you don't have to think so, but it is. The quad has to have a sleeve, how else do you expect to rebuild it or even to last? You're thinking the sleeve has a nickle coating. I donno where your getting "2 competly different machines" cause they are pretty damn similar. I own both and can confidently say that they are very similar. If it were rebuilt from the ground up it Yamaha would rename it and remarket it. Everything changed in the engine are small changes, give me some major changes that completly redesigned the engine like they did with the frame and suspension and I may change my opinion. You say there were tons of changes to make it "competly different", but failed to mention them, sure there were small ones to help reliability and useability with EFI and etc, but nothing major enough to call it a compelty different quad and/or engine. When going from one to the other the biggest noticable difference is the handling, power feels very similar with slightly better bottom end and mid range. If you're going from an old 660 to a 700 don't expect it to feel like a completly different quad.

 

Hmmmm,

Totally different head with roller rockers and 4 valves instead of 5.

New bore with that electro fusion stuff which i believe does not have a sleve as the electrofusion hadens the bore and no sleve is required. The bore must be re fused after it is bored out just like a modern 2 stroke.

Different piston

Dual couter ballencers

ratchet shifter transmission

different connecting rod

Larger displacement

Single EFI intake as opposed to twin carbs

So correct me if im wrong but all parts in the top end are vastly different in my opinion, i would say this engine is new from the ground up and would deffinatly breathe completly different to the 660 with a totally different head and intake. The only thing that is the same is the stroke length and hence power delivery is simular.

The only thing that is the same and why it is still called the raptor is its place in the market as a fun big bore sports quad.

 

Maybe I'm just stubbern, but those modification are still pretty minor with the head being the biggest change. We're not talking about a new performance engine here, just modifications and/or reliability updates to a previously designed one. Just because it has the same stroke doesn't mean thats why the power output is the same, the power output is the same because the engine is the same. By far the biggest mod to the 700 is the engine head, which is far from the whole engine. I still fail to see how this is a "competly new engine from the bottom up". IMO changing the piston/displacement, connecting rod, counter balancer, and transmission shifting are not going to classify this engine as compeltly redesigned or new. People bore out their quads and install reliability upgrades/mods all the time and they are still considered the same engine so why is this slightly updated 660 a new engine now? Basically it comes down to two major mods, the new head and the EFI, and the EFI isn't even part of the engine. IMO This is the same engine Yamaha has been making for 20 years...

If you really want a 700, don't buy it for the extra power, buy it for the much improved egros/handling and reliability.

Thanks for the info on that electrofusion technology though, it's quite interesting.

 

For the record its called Nicosell not nickel. I am not sure that is how its spelled but that is how its pronounced. As for wether or not it has a sleave I have no idea but contrary to what has been posted they are not REQUIRED. Not many of the engines in vehicles have sleaves. That is why you can only bore them so big before you run out of cylinder wall. If you do bore a cylinder with nicosell coating you have to send it out and have it recoated. For what its worth I am under the impresion that the machine is new from the ground up engine included. The changes listed above prety much make it a new engine in my book. I dont see many things that are the same left in it. Simaler, yes but the same, no.

 

Not to take sides here or get into a pissing match with any one, but i can point out a couple of other major differences between the 660 and the 700 that have not already been mentioned.

One is the size of the countershaft it is substancially larger on the 700 than the 660 The 660 front sprocket won't even come close to fitting. Another is the transmission, different ratios and different gear inside diameters with a larger main shaft. The crankshaft has a larger journal size and rotates on larger case bearings. There are no interchangable internal parts between the two engines that I am aware of with that and a complete redisign of the head If that's not a total redisign I don't know what is. The engine has been field tested for the last couple of years in europe as I understand it so it's been in use for two or three years but not twenty.