I have all 3 sitting right here mounted on the bikes. The modified stock one besides being made of cheap metal makes more power on the low than the jetpro and more top end than the IP2! I know I made it myself, I run it myself. The jetpro and the IP2 bikes can't touch my race bike and they both have BBK's installed! Both of those pipes are great pipes, they are made of excelent construction but the modded stock pipe out performs them all around. Ask IP2 he's the one who told me to mod the stock pipe! Welds work fine if you know how to weld! Reinforce all the factory welds and you won't have any problems. If you can't weld very well or know someone who can don't mess with modding the pipe b/c the metal is cheap and you must know what your are doing to make the pipe strong. I have never had a problem with my pipe and I ride it on a rough brick road almost everyday!
I have all 3 sitting right here mounted on the bikes. The modified stock one besides being made of cheap metal makes more power on the low than the jetpro and more top end than the IP2! I know I made it myself, I run it myself. The jetpro and the IP2 bikes can't touch my race bike and they both have BBK's installed! Both of those pipes are great pipes, they are made of excelent construction but the modded stock pipe out performs them all around. Ask IP2 he's the one who told me to mod the stock pipe! Welds work fine if you know how to weld! Reinforce all the factory welds and you won't have any problems. If you can't weld very well or know someone who can don't mess with modding the pipe b/c the metal is cheap and you must know what your are doing to make the pipe strong. I have never had a problem with my pipe and I ride it on a rough brick road almost everyday!
Don`t waste your time. I`ve been telling people this since this site started. Feel good that you know the real deal.
Yeah Hoss I know what you mean. Man I read almost all the posts on this board and I have to tell you that you know your $hit. You are very wise. I get alot of PM's from people asking for help and I help them how I can and I also give them the names of a few of the guys on this site who really know what the hell they are talking about and you are one of them. But you're right, there are so many negative people on this site that are too affraid to try stuff for themselves. They'd rather go with the crowd and buy up the "name brand" stuff so they will fit in. It makes you just want to give up trying to help people out and I have noticed alot of the very intelligent people that used to post lots of info now post far and few between. Anyways I'm with you, I'm sick of telling people the same thing over and over.
Ok, I started writing a big essay on what i did and why but in the end i'll just post some pix.
*In my opinion* A lot of things were wrong about this pipe so i just concentrated on the worst of it.
1. Exhaust flange to pipe adapter, made out of aluminium and ported to a nice smooth blend after this pic.
2. . Basicly changed the angle of diffuser from 11.5 degrees to 6 degrees, 7 degrees is better but i wanted an extra bit of length (don't we all). Chopped the whole thing off and made a new one (ouch).
The tuned length of the pipe was 507 from piston face to centre of baffle, that gave it a tuned working rpm of 13142 rpm, that was way too high, no wonder i have no powerband. The spacer and baffle changed this length to 606, that's a tuned rpm of 10995 rpm with my exhaust timing, bit high but better.
I could write forever about pipes but i kept it short, if anyone wan't more just ask me to crap on about them.
Ok, I started writing a big essay on what i did and why but in the end i'll just post some pix.
*In my opinion* A lot of things were wrong about this pipe so i just concentrated on the worst of it.
1. Exhaust flange to pipe adapter, made out of aluminium and ported to a nice smooth blend after this pic.
2. . Basicly changed the angle of diffuser from 11.5 degrees to 6 degrees, 7 degrees is better but i wanted an extra bit of length (don't we all). Chopped the whole thing off and made a new one (ouch).
The tuned length of the pipe was 507 from piston face to centre of baffle, that gave it a tuned working rpm of 13142 rpm, that was way too high, no wonder i have no powerband. The spacer and baffle changed this length to 606, that's a tuned rpm of 10995 rpm with my exhaust timing, bit high but better.
I could write forever about pipes but i kept it short, if anyone wan't more just ask me to crap on about them.
well, thankyou. Just for that here's another freeby, this is how i tune my stingers, i use a 15mm id tube, slide it down the silencer and hold it in place with a split pin. I found the 15mm worked best at 60mm length for my bike. The tape makes it a snug fit so it does not fall into the chamber when your changing them, be carefull. i use a wire with a small bend in it to pull them out.
Oh I see... You're sliding them down inside the stinger! I slid mine over the stinger and centered it up with with tape and then replaced the the red aluminum cover b/c I have a mount that attaches from the alum cover to the bike frame that takes stress off the rest of the pipe.
I don't recall complaining about the stinger poking out? I did say that when you cut the expansion chamber in half look inside the divergent cone and see if the head pipe is protruding into the chamber. If it is cut it off, some versions of the stock pipe don't have this problem.
Thanks for the pic though.
The secret is out: Guys this is one of the #1 factors to improving power in your bike.
well, thankyou. Just for that here's another freeby, this is how i tune my stingers, i use a 15mm id tube, slide it down the silencer and hold it in place with a split pin. I found the 15mm worked best at 60mm length for my bike. The tape makes it a snug fit so it does not fall into the chamber when your changing them, be carefull. i use a wire with a small bend in it to pull them out.
Pics a bit dark, overcast outside
Very interesting. I will have to experiment with this.
Anybody who's had a copy of A. G. Bell's excellent book knows what to do to a stock pipe - there's absolutely nothing new posted here.
I got my first copy when I was in England back in '83. Just got the latest edition - there's very little new in there either that applies to cags.
Yep you're right, someone needs to tell these youngn's to go and pick up a copy of his book. It's good to see people are trying things for themselves though.
Hoss is right too. Aside from what I've reseached in books he's one of the ones who told me to do this to my modded pipe and it works too. I'm guessing that his orginal post was lost when the servers crashed so this is new to some.
Well, sorrry, I guess that's the problem with sharing mods, there's always someone claiming they made it first or we done that ect ect. I wasn't here a year ago, only had this bike for about 3 months and ive never seen anyone post a how to make an adjustable stinger for pocket bikes before. Infact, i think i will keep my mods to myself in the future incase i rip anyones ideas off.
Well, sorrry, I guess that's the problem with sharing mods, there's always someone claiming they made it first or we done that ect ect. I wasn't here a year ago, only had this bike for about 3 months and ive never seen anyone post a how to make an adjustable stinger for pocket bikes before. Infact, i think i will keep my mods to myself in the future incase i rip anyones ideas off.
LOL! I've never seen anyone post on the adj stinger before either, I've only had my bike about 5 months now. Got it right when the site went down. I read a post about someone modding the stock exhaust like I described how to do earlier in this post then the next day the site was down. I read Bell's book back in high school when I got into modding my KX125 into a 190cc monster (put a KDX180 head on it and bored it over). Just remember that there is nothing new being done to these bikes a 2 stroke is a 2 stroke wether it was made in 1950 or 2004 the tech is all the same and people have been modding them for years. I find that technology is reciprical, it fades out for awhile then comes back around. Obviously you or Hoss or myself or anyone on this site didn't invent the stinger, but it's great to share the tech with people b/c there are a lot of young guys whose first thing with and engine is thier cag and they're just learning. Not everyone can be an engineer so keep posting your mods and ideas, chances are someone has tried it before and may even be able to help make it better. Just my $0.02.
Tblumer, I'm still waiting to get a PM telling me to remove my avatar so we'll see, I have plenty more pics!
