| Author | Message | ||
     Rocketsprink |
OK. I have a 03 9R that is used as a full time race bike. It has a little over 10,000 miles on the clock. I'll be rebuilding the forks over the winter. Revalveing and new springs. Upgrading the rear shock as it is all bone stock right now. As far as the engine goes. Without a total tear down and rebuild, which wouldn't be a bad idea, what are some things you guys would do to "freshen" up the motor? I have a few friends that work for Buell and I'm sure they'd say rebuild the whole thing. But I don't know how involved I want to get. Any idea? And thanks! | ||
| Steve_mackay |
Rocco, I'd just tear the whole thing down and rebuild it. They aren't *THAT* hard to do. I'm sure Jason and I could be persuaded in to giving you a hand. Get an XB12 crankshaft while you're at it, and keep the XB9 pistons. | ||
| Schmitty |
This may sound like a really stupid question, but what is the 12 crank going to get me? I have an XB9 also and I've heard a few people make this mod. Schmitty | ||
| Toona |
With only 10k on the motor, why would you want to tear down the motor? My 12 didn't really start to run until it got to 8k or so? Why "tighten" it back up with new pistons/rings? I could see the benefits of maybe a port/polish in the heads.... | ||
| Glitch |
but what is the 12 crank going to get me? Stroked. 1203cc engine. And the red line to match. | ||
| Rocketsprink |
cause racing takes a bigger toll on a motor than street miles do. | ||
| Lucas70374 |
making it a 12 would make it higher compression. I think a race gas would need to be used | ||
| Glitch |
All I know is I've got over 56thousand miles on my 03 XB9S, and I don't feel the need to refresh my engine yet. It's still as strong as ever. Of course though, I never go over the posted speed limit. | ||
| Rocketsprink |
Again, as posted, a total tear down isn't part of my plan. It may come to that. But right now, I'm looking for suggestions as to some "investigation" work that could be done. Pull the heads and peak at the inside? Etc, Etc. Again, bounce it off the rev limiter a crap load of times, in one race. Miss shift at redline, more than a couple times in a race. Keep the thing screaming at 7 grand and above every time you ride it. I think a little preventive maintenance is a good idea. Last thing I need is the motor to take a shit next year. One of those could of should of moments in the making. | ||
| Sub65chris |
but what is the 12 crank going to get me? Stroked. 1203cc engine. And the red line to match. Why not just get a 12 motor? or is that all the 12 motor is .( i'm un-educated) | ||
| Steve_mackay |
Putting a XB12 crank in to a XB9, while keeping the XB9 pistons gives it a 11.5:1 compression IIRC. Rocco, you should really get Terry and Danny's opinion. They've seen more XB race motors than just about anyone, and are more than willing to offer advice. | ||
| Xb9 |
I'd pull it down to the crank if it's got that many track miles. Mainly just to check and inspect. If everything looks OK then reassemble. A couple of things I'd be keen on when these things are run at high RPM's all the time are: Pull the gearcase cover and check the oil pump drive gear (replace with the High performance one), cams, and cam bushings. Make sure that pinion nut is torqued to spec (or a little more than spec). take a good look at the pinion bearing and races. remove and replace the transmission countershaft retaining bolt. It's behind the clutch. Put tons of red locktite on this one and check it often. It has a tendancy to back out and when it comes off will make a mess out of your cases and/or primary. This is only an issue on the earlier transmissions, they changed it on the later ones. | ||
| Slaughter |
The rev limit IS hard on these engines. At least check run-out on the bottom end. Top end, for sure do compression check, pull the top off and do a direct, visual check. Valve springs probably need replacing and I'd think seals and re-seating valves too. Springs tend to soften. If you don't have aftermarket springs, now's a good time. Based on mine, I don't think there's going to be too much carbon unless you've converted to run leaded race gas (doesn't sound like it though). | ||
| Blake |
Sprinkle-master, If the compression and especially the leak-down show good for each cylinder, I'd just check the valve springs like Slaughter suggests, the crank assy run-out via the gearcase/cambox also per Slaughter, and check the oil pump drive gear for wear. | ||
| Spiderman |
New rings, freshen the cylinders and new valve, intake and exhaust seals. The lower end is a tank but I would update to the new bronze drive gear if you haven't already. | ||
| Thumper74 |
Screw it. www.Amsoil.com. Buy an oil analysis kit and send it in. I did it on my Focus, Mach 1 and Harley. Everything checked out | ||
| Rocketsprink |
sprinkle master??  Thanks for the idea's. I appreciate them all. | ||
| Buellinachinashop |
When I was at the PDC they had a Thunderstom ripped apart. I was shocked at the lack of parts. I'm having head work done this winter, now am thinking of adding a new crank. How much is a 12 crank new? | ||
| Rocketsprink |
Don't know about new, but there's one on Ebay now and they're asking $425 for used. The must be pricey new. | ||
| Bombardier |
Freshen the heads from revperf and get the heads,valves,pistons etc finished in ceramic by HP Coatings. Cheap reliable horsepower and insurance. Bike also runs cooler and will let you get a better fuel map from front to rear. My two cents worth. | ||
| Buellinachinashop |
Wow, 425.00 is a tad more than I'd have thought. | ||
| Blake |
Sprinkler-führer?  | ||
| Slaughter |
If you are really racing, consider talking to John Dahmer at Darkhorse Crank Works. See about a lightened/balanced system. Quicker revving and not a big hit on durability. http://darkhorsecrankworks.com/ (Message edited by slaughter on September 30, 2007) | ||
| Rocketsprink |
Actually John and I are friends. He and Jeff Johnson pitted with us at Homecoming and John and I crewed for James Gang Moto-ST at Homecoming and Iowa. I will absolutely speak with him on this matter. Again, I appreciate all the posts and ideas. |
