Well I adjusted my valves the other day. I guess i didnt get the exhaust rocker arm nuts tight enough because the came off. I found one of the nuts but i think the other is down lower in the engine. :( but the good news is it didnt damage the rocker arms or cam. the motor still turns fine with now binding so i think i may have got lucky. so I decided to do a rebuild. Im thinking a cp 11:1 piston and a hotcam 3 also thinking about auto tune. what are your thoughts on this combo? Thanks
I don't think you'll need the autotune for those mods, there are plenty of maps for that combo, and I've heard it'd be a good runner with that setup. Sucks to hear about the dropped nut though...don't worry you're not alone in that category :lol:
Ya i couldnt decide on the auto tune because I cant seem to find any maps for hmf exhaust. Any other mods you would recommend while im in there?
dropped bolts :help:
I know that all to well :(
if you want to do a stroker build I'd help you drop the crank in. That way we can take a look and see if the bolt did any damage in the lower end. 250 for a hr +5 crank is hard to beat!
I want to do a crank but i want to get this thing up and running soon. Im going to get a magnet tomorrow and try and find that nut. I got the head and cylinder off. I attached a pic of the cylinder does any one think I need to get it sleved or am I ok? I will get a better pic tomorrow.
I wouldnt go ahead with autotune. I didnt have much luck with my PC5 Autotune. It really gives some off the wall trim characteristics. You are better off getting a solid dyno tune on it and sticking with that IMO
Well i found the nut. :) It didnt do any damage thank GERD. But now i need to decide if i want a big bore or get my cylinder redone. :help:
105 bore it if you're gonna have any work done. Get either a 10.75:1 or 12:1 CP and call it a build :thumbs:
Quote from: Spartan727 on July 27, 2010, 11:21:56 AM
105 bore it if you're gonna have any work done. Get either a 10.75:1 or 12:1 CP and call it a build :thumbs:
Any one you would recomend to bore it?
Bore and replate isnt tough. I went with US Chrome, they did alright. The over spray from the plating needed to be ground down and granite blocked for a better seal on my head gasket. But they were great to deal with and a great price. Make sure you send the piston with the cylinder and take EVERYTHING off, including that little oil return nipple on the front of your cylinder.
Quote from: shookie on July 27, 2010, 11:25:26 AM
Quote from: Spartan727 on July 27, 2010, 11:21:56 AM
105 bore it if you're gonna have any work done. Get either a 10.75:1 or 12:1 CP and call it a build :thumbs:
Any one you would recomend to bore it?
hit up Preddy, he "bores" me daily :rofl: HEY OH!
and I'm out....
I know of nobody in Iowa. Our local yamaha shop does stuff for MX racing, but that is all I know.
Sleeving seems to be a great option. I've heard rumor Bo is not doing boring any more. If that's true, I don't know where I'd go.
Well i ordered a 105mm cp piston and and a hot cams 3. Does any one have a map for hmf exhaust with hot cam 3? Im going to send the cylinder to us chrome when i get my piston.
Quote from: Alkire193 on July 27, 2010, 12:14:00 PM
Bore and replate isnt tough. I went with US Chrome, they did alright. The over spray from the plating needed to be ground down and granite blocked for a better seal on my head gasket. But they were great to deal with and a great price. Make sure you send the piston with the cylinder and take EVERYTHING off, including that little oil return nipple on the front of your cylinder.
How did you get the oil return nipple off? im having one hell of a struggle not to mess it up taking it off. Thanks
Its threaded, the shop I sent mine to took it off and never gave it back. About 1/8" to 1/4" inside the cylinder it starts to thread. There is no replacement for it, so if you do destroy it you can drill and tap a fuel fitting into it and it will work just fine
Quote from: Alkire193 on July 30, 2010, 06:11:09 PM
Its threaded, the shop I sent mine to took it off and never gave it back. About 1/8" to 1/4" inside the cylinder it starts to thread. There is no replacement for it, so if you do destroy it you can drill and tap a fuel fitting into it and it will work just fine
Well i destoryed it trying to get it out :clap: at least my cylinder is ready to be sent out now. I have a question on the piston rings how do i tell what ring is the top one and the second one?
Thickness, use a vernier caliper to figure out which is thicker. Are you going after market piston? If so the ring gapping is provided by the manufacturer. If its the stocker then just check the Manual and measure, Usually the thicker ring is second if I remember correctly. Replace ALL the rings!
Did you decide to resleeve? Otherwise youll have to nikasil every so many hours.
(http://i35.photobucket.com/albums/d162/bit646/IMG_0166.jpg)
I went with a cp 10.75:1 and im sending it out to us chrome cant wait :nana:
Any one have a map thats close for 105mm 10.75:1, HC3, hmf exhaust?