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01 Rappy 660 Build Questions

Yamaha YFM660R Raptor (2001-2005) - Yamaha ATV Forum - www.bluetraxx.com
Hi there,

I have posted this on many forums but have yet to get a useful answer.

My rings on my stock motor finally got tired and gave low compression. I tore down and found that my walls were a bit scuffed and piston skirt as well. The OEM rod has some scrapes where the wrist pin goes and its not sitting well with me so I am going to upgrade that.

I want to go with a Wiseco 11:1 686 build. Here is what I have sourced so far...

Wiseco 11:1 102mm piston/gasket set

HotRods OEM connecting rod

OEM crank (polished/balanced)

Full HMF performance exhaust

K&N filter (no box mods)

Jets -TBD

Here is my dilemma.... I can only get 91 octane fuel where I am. I am at ~250m elevation.

Will this setup suffice? or do I also ABSOLUTELY NEED a cam to go with it? I understand the cam will wake the motor up some more, but Im on a little bit of a budget and that extra $200 is a bit much for a university student haha.

If there is anything I overlooked, please let me know. Or if you have other suggestions, feel free to state them.

Thanks
Date: Jun 21, 2017   


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