I am thinking about building a 686 myself. I would love to have Trinity do it but I can get all of the work done for free. What do I need other than a piston, cam, springs, and gaskets? The guy doing the machine work is real good on two smokes and has done some four strokes so he knows whats going on in there. The head work is the only thing I wonder about. Is there some secret formula to a Raptors head that would help out? Does anybody have a flow chart of one of Trinity's heads with the stock size valves?

This isn't a deffinate thing so all comments, good or bad, will be VERY helpful.

 

Go talk to airraptor and he will tell you about the 686 kit. he have it on his bike

 

There are a few people on here with it, I was hoping some of them would chime in. There are plenty of people on here with alot of knowledge about the Raptor and the 686.

 

Ward- pm raptorboy673 he did all his porting and stuff. My Trinity 686 has not beat his yet, but the day is coming. (june 29th Aledo Tx) I do not think it is complete rocket science. The port and polished head is the BIG DEAL on the raptor.

 

I don't know the extent of the performance yet because I am just starting to break mine in. I did the tear down and the assembly myself. The kit includes a new piston, cam exchange, and a variety of valve/spring options. Trinity did the cylinder, head, and valve work. See their web site.

Save $50 and bore the cylinder yourself and send the rest to Trinity for flow bench tested porting and precision valve work.

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I looked at Trinity's site, looks good by the way. Its like $1300 for a 686 kit if I remember correctly, just off the top of my head, I am looking at about $600-700 in parts. Thats a fairly good margin for me. I know that it might not be as good but $600 is a big savings to me. The only thing that concerns me is the head.

 

Ward

Ok, I had a Trinity 686 (102mm 11:1 piston, Web grind #461, port, race cut valves, +2mm stainless center intake valve, stock carbs, slip-on pipe and a proline airbox, all for about 6 months. I should have my 727 in the next couple of weeks, whoooohoooo!

What would you like to know? Anything specific?

One item I would make sure you get, and this is only due to my own personal and expensive experience, GO WITH THE CARILLO ROD! Many others have not and haven't had any problems (good), but I am paying the price now. Fluke? could be, but is it worth $200 today, or $1000's later? I really think it is a roll of the dice, you be the judge.

Swy

 

I learned the hard way that a local polish and port just doesnt cut it, I did my own 686 last year had the local shop do the p&p and was disapointed with the way it ran, I finally sent the head off to trinity a couple of months ago and when i got it back it was WAY better and had the hit i was looking for in the first place, some things are just better done by a professional shop, the mechanics of engine building and assembly are pretty straight forward though

 

Another thing on the bore.....unless you are certain of your local shops ability on boring, send the cyliner off as well to get everything done perfect! I have been bite by the bad bore bug before!

 

" Long after the joy of the bargain is gone, the pain of inferior quality remains" [img]i/expressions/face-icon-small-happy.gif[/img]