Time to rebuild

[trashedbanshee]

Took my banshee out saturday and rode 20minutes before she died. Was going along and she just bogged down and died. I noticed the head was smoking and was very hot. I took the rad cover off and had nothing in it. Everything was pushed out the resivoir bottle. I added water and it was leaking around the studs on the haed. Tightened everything up and no leaks. I tried to start it and had no luck at all. Checked the plugs and they were wet. I had blown my head gasket.

 

I took it home and replaced the gasket and got all the water out of it. After numerous attempts I could only get it to fire on one cylinder. The next day I stripped it down and found out that my reeds on the right side were all distorted, Im guessing from the heat. I took everything off and see the one piston looks pretty shitty, so Im going to put new pistons and rings in it. I measured the cylinders and im still in spec so Im going to clean em up with a hone.

 

I ordered a Wiesco piston kit, Pro Design Coolhead w/20cc domes, and will be using V-Force 2 reeds. Id also like to clean up the intake and exhaust ports on the barrels. I don't wanna get to crazy with porting and polishing, just looking to smooth them out with some emry cloth and a die grinder. Currently I have FMF Fatty pipes, FMF Ram Valve reeds, and a K&N airfilter with no lid. I have stock carbs, stock head and I ride at sea level. I've also been running 100 octane mixed with Maxima Castor 927 at 32:1. Will I be able to ever go back to running 93 octane with 20cc dome in the head? I think when I bought my exhaust it came with 165 main jets and I think now im running 170s. My jetting now is perfect, but will the Coolhead w/20cc domes, the V-Force reeds, and the slight polishing I do to the intake and exhaust really effect my jetting? If so what do you guys suggest I do?

 

Thanks for any suggestions or help.

Edited August 15, 2007 by trashedbanshee

[trashedbanshee]

anyone?

[blowit]

anyone?

 

175 main jet and fine to use pump fuel with the 20cc dome at 500ft and above sea level.

 

 

Brandon

[fastbanshee8]

Stock carbs with 165 main jets will be running really lean. More like 260, or 270 mains, since stock is 200. If you change much with the porting, you will have to jet it richer. Try two, or three sizes bigger on the mains, then do a plug chop to see where you're at. As far as running pump gas goes, you will have to do a compression check, once you get it broke in, and let us know what it is, then someone can tell you if pump gas will be safe.

[blowit]

Stock carbs with 165 main jets will be running really lean. More like 260, or 270 mains, since stock is 200. If you change much with the porting, you will have to jet it richer. Try two, or three sizes bigger on the mains, then do a plug chop to see where you're at. As far as running pump gas goes, you will have to do a compression check, once you get it broke in, and let us know what it is, then someone can tell you if pump gas will be safe.

 

 

I guess I was assuming Keihin carbs here since the 165 would be a valid Keihin size. I did not comp for the porting since emery clothing the ports should not affect them enough for jetting changes.

 

 

Brandon

[fastbanshee8]

I guess I was assuming Keihin carbs here since the 165 would be a valid Keihin size. I did not comp for the porting since emery clothing the ports should not affect them enough for jetting changes.

Brandon

 

He did mention that his carbs were stock, and he also mentioned a die grinder, so who knows how much he will do with the ports.

[trashedbanshee]

Yes my mistake on the jetting. Its been awhile since Ive rejetted my carbs and Ive ran both Mikuni and Keihin carbs, i just got confused. My exhaust came with 265 main jets and I think I have 270s. Im not really going to open up the ports just polish them. I wanna remove any roughness from casting.

[trashedbanshee]

Ok my head gasket was blown and I have it all back together, but she still doesnt run. I had FMF ram valve reeds and they were distorted from it being so hot. So I replaced them with V-force 2 reeds, was I suppose to trim the stock intake manifolds to be used with the v forces? I also smoothed out both the intake and exhaust ports. I bought the pro design head and have 20cc domes. I rejetted my carbs from a 260 to a 270 jet, didnt touch the pilot needles or idle. Everythings all back together and I was hoping to hear it run tonight, but nope. I have no idea what it is. I have compression, spark and seem to be getting fuel. I have fuel from the fuel lines and the bowls of the carbs were filled when i pulled them off tonight to check and make sure everything was good. Is there anyway Im still not getting enough fuel to the cylinders. Or could I be getting too much fuel? I might go back to 260 mains and see what happens tommorrow. I really need help I havent been able to ride the thing for more than 20 mins in over 6 months. HELP!

 

 

 

 

thanks

[fox_forma]

your mains will have no affect on starting. If you are getting air/fuel/spark could be you need a richer pilot circuit, or you could try turning you A/F screws in a 1/2 turn or so. But I'm also guessing since you blew a gasket and coolant was going everywhere that you have coolant in your bottom end and its not allowing the bike to fire up as you are soaking the plugs upon kicking it over.

Edited August 23, 2007 by fox_forma

[trashedbanshee]

your mains will have no affect on starting. If you are getting air/fuel/spark could be you need a richer pilot circuit, or you could try turning you A/F screws in a 1/2 turn or so. But I'm also guessing since you blew a gasket and coolant was going everywhere that you have coolant in your bottom end and its not allowing the bike to fire up as you are soaking the plugs upon kicking it over.

 

Ive had the whole topend off down to the crank and rods. While I was in there i sucked all the water out and sprayed brake cleaner down there and sucked all that up afterwards. I blew the bottom end out with an air gun and oiled it with belray 2 stroke oil. I replaced the top end with .020 wiesco pistons and had the cylinders honed. I put the head and reeds on, and installed the carbs back on with only changing to 270 jets. I only changed the mains in the carbs. Before the head gasket went it ran fine with the same settings and 260 jets. It has everything to run it just doesnt. Doest even fire sputter or bog. I have also tried pop starting in and had no luck........this is very fustrating. Thanks for the info if i have no luck ill try what you suggested.