I asked this as part of another thread but it was left unadressed. Has anyone tried the edelbrock carb for a hi compression 686? How about comparison from stock carbs to FCR to quicksilver? I'm getting tired of screwing with the stock carbs as jetting as high as 195/200 hasnt been rich enough on the mains yet and I'm wondering if an aftermarket carb will make it quicker to adjust for altitude as I ride everywhere from sea level to 4500ft. Rejetting the stock carbs is a real pain after you have to do it sixteen million times. The quicksilver is alot cheaper than the FCRs and if it's close enough I'd be willing to sacrifice a little for half the cost.

 

I'm in the same boat dude I hate the stockers on my 686 and was wondering the same thing. The $ for FCR's is a bit much for me and if the Quicksilver perfomed as good as the stockers without the trouble I would buy one! I just wonder about the top end performance going from two carbs to one.[img]i/expressions/face-icon-small-disgusted.gif[/img] I had the same problem with the high jets being too lean. I raised my float level just a little 2-3 mm and it riched the whole circut from where the needle comes on to the mains. It worked for me not shure how right it is. If you use the clear tube trick to check the float level, mine is about 1/4" above the mating surface of the float bowl. And no gas comes out the over flow tubes. and I went from running 195/200 jets to 175/180 and its perfect at 1500 ft.

 

Yep those stockers are a pain. If you ever plan on building your motor, I'd skip the edelbrock and save your pinnies for the FCR's. I've heard several people who have ridden lots of raptors say there is no comparing the two. I've asked several engine builders and all agree, stay away from a single carb setup on a built raptor. I have heard those who dont have a built raptor say the edelbrock is a small improvement over stock.

 

If you have the money go with the FCRs but you sholdn't need to rejet going from those elevations unless you want peak performance. The raptor can tollerate a pretty rich mixture and still run strong in fact I think it likes being a bit fat, at least mine does. But they are a PIA.

 

Do you care about twist vs. thumb throttle? If so, you may not really have a choice.

 

get the fcr's

 

Go with the FcRS there a pumper style and i think just plain better for a builr raptor compared to a sigle edelbrock set up. And you can have a thumb throttle, i think twist throttle is suicide on a raptor.

 

Actually my Rappy had a bit of a gurgle at quarter to half throttle when riding at 4500'. It's definitely a needle issue but I figured that the aftermarket carbs are supposedly easy to rejet and the stockers arent. Someday I'll get this all worked out whether it's with FCR's or getting my stockers properly dialed in. I'm about to fork over the money to have LRD jet it on their dyno, they have a tailpipe sniffer to make sure the air fuel ratio is proper from top to bottom. I'll be sure to have them err on the side of caution and run to the rich side to be safe. I do think it's more important for my machine to run at sea level stronger than mountain riding but I'd prefer it not to run like crap up there.

 

Do you know what type of dyno they use?

 

It is funny to see how many people have an opinion on this carb issue when none of them have run both set-ups on the same machine and know the differences... LOL!