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Old 10-27-2011, 12:12 AM   #11
Rick C.
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Quote:
Originally Posted by ol brown shoe View Post
I was one of the fortunate few who got to test(seat of the pants style)the very impressive "sleeper" pipe. During the already excited atmosphere of EF2, Dave whips out a stock looking pipe and after fine tuning the jetting on Ricks 71DT1(came to EF2 needing fine tuning)installs the "sleeper" pipe. The "sleeper" pipe made a huge difference. Low end and mid range were enhanced enough to fell the difference. The top end is where this pipe makes things come alive. All the while allowing the motor to rev much easier, pulls to the top end much quicker. It's like it can breath better.

Dave put me down for one for the RTunoB.

Boy oh boy. The first mod for the RTunoB!

I've read the posts DTMEIS put up while he and DVM were developing the "sleeper" and they have alot of work and effort in this unit. It really came home to me after the test.
Sending PM now.
Just what the heck is a , " r TUNO b ? " a fishy smelling bike?
You get that pipe before me...I steal it .
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Old 10-30-2011, 03:33 PM   #12
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dtmeis,
Just wanted to let you know I'm on the look out for another 70-71 pipe w/larger stinger so we can get this pipe a sleeping. Saw a brand new one on flea bit for 359.00. Ching, ching!
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Old 10-30-2011, 04:33 PM   #13
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Thank you for the update ol brown shoe !
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Old 10-30-2011, 10:02 PM   #14
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Are you going to have a"sleeper pipe" for a '75 Dt400 sometime? lha
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Old 11-02-2011, 02:25 PM   #15
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Quote:
Originally Posted by lha View Post
Are you going to have a"sleeper pipe" for a '75 Dt400 sometime? lha
Lha....unfortunately no. Since the stock DT400 pipe is actually a "decent" pipe and Yamaha made the pipe as an expansion chamber...so the "sleeper" mod is not applicable to that pipe.

The 1973 and earlier pipes appear to be designed with performance secondary and looks and contouring to the bike as a top priority ....the internal cone I fabricate and install makes the pipe perform as an expansion chamber and you get the "supercharging" affect.
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Old 11-02-2011, 08:44 PM   #16
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Lost the bid on the new OEM pipe. So the search continues for a pipe to sleep with.
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Old 11-05-2011, 09:19 PM   #17
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DVM and I finished up Sleeper Pipe #5 for Lbrandy's DT2. After each pipe is built it is test on a bike to verify it's operation. Fortunately last weekend DVM and I got the DT2 Barn Find running....so we were able to test both and compare our demo "Sleeper Pipe"versus Lbrandys new "Sleeper Pipe".

Great news Randy's pipe actually pulls harder than the demo pipe because of the mods we needed to do on his spark arrestor....

Randy your gonna like your new pipe !



Demo 'Sleeper" pictured on the Barn Find
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Old 11-06-2011, 10:59 AM   #18
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As previously mentioned here ... I offer two options on the Sleeper Pipe.

The following is to show some basics if you are going to open up the pipe and send;

First the pipe needs to be held securely in place...so it can be cut open.



Using an angle grinder and a metal cutting wheel the pipe needs to be cut. You need to make your cuts as precise as possible.



Here's how it should look



Since you will be making "plunge cuts" you will have some excess length in some of the cuts... remember there is an inner linner that must be cut thru also. You just don't want to butcher the pipe
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Old 11-06-2011, 11:12 AM   #19
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Once you have made your cuts all around....you will then need to use a screwdriver and a steel punch to break any metal away that is still holding the cover in place... take your time and work your way all around the cover. The two vertical baffles will need to be cut or broken away to get the cover off. Expect to spend an hour or two cutting and working the cover to get it off.... take your time and try not to bend stuff too much.

Here's what the inside looks like



Take notice of the two vertical baffles that had to be cut way to get it open. You need to make sure you dont damage the spark arrestor (thing with holes in it) when doing this.

Next I will be showing what needs to be removed from inside the pipe.
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Old 11-06-2011, 02:14 PM   #20
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very interesting, please go on...
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