I know there are guys out there that run these. Over the long haul hows the valve train holding up? Any problems? And how many of you had to machine your valve guides?

 

Lowbowtie- I saw one in Bob's shop with around 100 hours run time (most 300 to 600 feet at a time) The rocker faces were showing wear. This was on a 727 that was a 2002 model that had a stage 2 before the web. Rockers are not that expensive. Just replace when needed. I believe web charges 200 plus for hard faced rockers where new factory ones are 30 percent of that.

 

Thanks 14

 

Lowbowtie- You also have to machine the 3 intakes. I would take a dremmel tool to them instead of buying shorter guides. The guides can be a pain in the @$$ to install.

For what is is worth, i did not like the web 685 cam in my hi-comp 686 with modded stock carbs. I know have a stage 2 back in mine. I do think a 685, 35 mm FCR's and a 660 or 686 would be okay. I had to really put the fuel to the 685 to get it to haul on the top end. By the time i got the top end dialed in there was no way to dial in the bottom end and early midrange. I was running the equal of 245 main jets. I bought a 100 piece drill set and started working my way up. If you are a 300 foot dragger stick with the stage 2 if you like the 1/8th mile more or hill shoot the 685 will be a better choice. I personally do not like to see my engine spinning in the 10,000 rpm range. 8500rpm's is plenty to put the hurt on most quads

 

The additional info was exactly what I was looking for. I'm gonna stick with my stage II for now, but when I do my next motor the 685 should be exactly what I'm looking for.[img]i/expressions/face-icon-small-wink.gif[/img] I almost wish I had the Extra $$$$$ I would buy a spare Motor and Start Now. I have almost as much fun building motors as I do riding.[img]i/expressions/face-icon-small-happy.gif[/img]

 

Lowbowtie- Around here on the week end if the weather is bad and we are standing around shotting the bull it will not be long before we will tear a raptor motor apart just to see if the piston is still silver colored. lol

 

I know what ya mean.[img]i/expressions/face-icon-small-happy.gif[/img]