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So i was out cruising the web and happened upon a " looking for the best pipes for my RD400" Thread.

Not going to mention any names here, but there is a certain cat out there claiming that his pipes will push 75 hp out of an RD 400 with 34mm carbs and porting, which he stated the porting changes some power output but his pipes make the biggest improvement-bar none.

Have I missed something?

Im not on here as much as i was in past years do to a shift in hobbies, buildings and having kids, but what the hell.

I know Chuck was making some pretty sick power out of his 400, but I just dont recall exactly how much. And if anybody is going to make big power it would be chuck.

Just the fact that the guy claimed his pipes made up the biggest difference and the porting was minor has me really second guessing things?

Just wanted to check in and see if there is any truth to this.

Anybody ever retrofit some 28mm carbs to a 125 twin?   

The TA 125s ran 20mm carbs and I think the stock tiekees are 16 or 18 mm>

The barrels being used are ported- nothing crazy and the pipes will be a variant of the TA 125 pipes.

Going to run the bike as a little in-town ripper

A few months before the old site went down there was a thread about jetting an RD 400 with 34mm round slides.

Anybody gave it saved?

I thought I did as I'm putting 34s on my 77 rd 400, but I can't find it in my files.

Just wondering what needle and needle jet was preferred?