| Author | Message | ||
     Deanh8 |
My XB9 is my main bike, im currently putting an XB12 engine into it. My tube frame is the bike I ride when my XB is down. I melted a piston into the side of the barrel on the tube frame and I have an extra XB9 engine sitting here. I want to run the pistons, heads, and cams from this XB9 engine on this Tube Frame 1200cc engine. I got a few other personal life issues going on right now and its not really feasable for me to build this tube frame bike up right, so its another reason I want to use the parts I already have. Anyone on here street a 1200 with XB9 pistons on 91 octane gas?. Where can I find thicker head/base gaskets to help bring the compression down a bit? I hear of people on here saying its very sensitive to street driving, and most of you guys have 93 gas which worries me with that crappy 91 california gas we have out here. Any other insight on this for a street bike would be cool, thanks! | ||
| Littlebuggles |
Tatoodnscrewed ran XB9 pistons and heads on his M2 if I recall the bike correctly, might have been his S1 though. Seems like he had trouble with the bottom end on it, I believe it was due to the high compression and the former rough life of the bike. If I can find his info I'll put it up for you. I've not seen him post for a while. But he could still be lurking I suppose. | ||
| Phelan |
Keep in mind octane is relative to elevation. However, I wouldn't run xb9 pistons in California heat anyway, but that's just me. Ricky (the4ork) has them in his S1 though and liked them. He had a few mods done to the pistons, but I can't remember what. | ||
| Fahren |
Dean, your profile doesn't say which tuber you have. If the options are either not to have the second bike up and running at all, or to set it up with the xb9 bits, then I'd choose the latter, unless it's a totally stock S2. Use the whole top end, including the rocker covers, so your clearances will work. I guess you have either an x1 or an s3; otherwise, you will have to drill and tap for a carb mount. And the front engine mount is different. If you have the time, go for it, and if you don't like the results, you can always go back to stock when time/money/circumstances allow. | ||
| Deanh8 |
I have a '00 M2, making the M2 mount work and tapping for carb mount holes isnt going to be an issue, neither one of those will cost me any money to do. I think I can open up the CC on the head, mil a bit on the piston and run thicker barrel and head gaskets and hope it puts me in a decent range. What else can I use from the XB engine? Pushrods, lifters? As of right now just the pistons, barrels, and heads (with rockers/springs) | ||
| Fahren |
Cometic gaskets are available in varying thicknesses. | ||
| Phelan |
Pushrods may be useable, but I dunno since the cam order is backwards on the XBs. The oil pump is useable. I "think the tranny gears can be used as well if they are put on the tuber shafts. Also the primary gearing is the same as the tuber. | ||
| The4ork |
i have them. i had an air force machinist shave the pistons for me. he was very knowledgable and knew engines pretty well. he took my heads and cyls/pistons and put bigger valve relifs in the pistons (i have oversized valves) and also dropped them down .5 in compression. i run 91 gas all day long, in the winter i was on 89 for just commuting with no issues. and im also using the irridium race plugs with stock ignition (retarded a tad) XB 12 heads - stage 3 nhrs XB 9 pistons/jugs 205 main jet summer, ran a 200 winter. probably will leave the 205 in, lost about 1-2mpg, but that may just be from the temp / atmo pressure (Message edited by the4ork on September 06, 2010) | ||
| Deanh8 |
/\ what about cams? Can I use the XB cams? | ||
| Tattoodnscrewd |
XB9 pistons are fine as long as you have it properly tuned/timed. Having a selectable curve ignition module is pretty much a must. No on the XB cams. You can do an XB grind on the cams for the XL based motor, we just installed a set of .550's (The XB grind/ramp is actually less aggressive and easier on the valvetrain than say .497 lift cams.) on Wilson's M2 with XB9 pistons ... 91 octane is fine ... My S1 was done 3 or 4 years ago now, been in pieces waiting on funds for a new crank for 2 or 3 of them years. Stock lightning cams, complete XB top end with XB9 pistons. Problem with the S1 was over revving at the drag strip (red line set to high and didn't pay attn - my own fault), plus the early cranks weren't the best.That is what led to it's demise. Unless you know someone that can do it on the cheap, or you can do it yourself, or have money to spare, all the extra machining or valve work isn't going to be necessary - You can use all stock Buell parts right off the shelf, gaskets, and all - stock push rods are fine as well. (Message edited by tattoodnscrewd on September 21, 2010) | ||
| Tattoodnscrewd |
Just searched .. it was 3 years ago .. ugh .. seems longer ! http://www.badweatherbikers.com/buell/messages/476 23/282881.html?1181924405 | ||
| Cfboss |
Here's another good article from Wes Orloff. He helped set-up the motor on my X1. He's a wealth of information. http://www.trackdaymag.com/Articles/Red,-White-and -Buell-Part-4,-More-Power!.aspx | ||
| Brinnutz |
Linky no worky for me. But it could be my phone. | ||
| Deanh8 |
 took .020 off the top of the piston, did a little work to the bowl in the head to. Hopefully that will drop my compression a tad bit to make it a little more street able for this hot cali weather with •••••• 91 gas. Also going to run a hi-4 ignition to back some timing off. | ||
| Xb12rider |
Higher the compression the higher the octane requirement. Octane stops knock and you are lowering compression by shaving ( milling ) off the piston you may need an oil cooler that piston loses some heat conduction ability and if you can polish the milled section to match the rest of the piston face cause you would hate to have burn through because the milled part coked up with carbon and made a hot spot. Don't think it can't happen it can . | ||
| Deanh8 |
That was right off the mil, its all polished up now and smooth. I have an extra XB cooler but not sure if the pump can keep up, someone told me it wouldnt be able to with the cooler. Im sure the extra oil in hurt either. Im going to run a .040 head and .020 base gasket but im pretty sure those are both stock sizes. any idea of what plugs to start out with? |
