Pipes!

[vivekjayasheel]

Finally managed to fit those today. Had to take off the side stand bracket and do lotsa wrestling to get them to fit.

Still fouling a bit with the kickstarter but sitting nicely now.

And... umm...

THEY'RE FUCKING WICKED!

First time didn't have the guts to open her up in first, so took her to third and gassed it. It's like having a turbo bolted on and suddenly things get blurry LOL...

Then did the same in second, got a fiercer kick, but noticed that she burbles and the power plateaus (does not stone-wall though, like those silly Shakeel pipes)... the rpms rise but the increase in power is not that drastic, after the first kick.

So I guess I need to start by advancing the ignition a bit...

She's running around 12 to 14 degrees timing, and Ron's 250 size jets (which on visual inspection seem bigger than Mikuni 280s).

How will I know when to stop advancing?

And once I reach a point where I am happy with the timing, should I attempt to down-jet?

I don't think the pipes are working ANYWHERE close to their true potential, but the kick is still fierce enough to lift the front in first gear.

And they are LOUD. As a temporary measure, they're stuffed with jute. Will stuff them with glasswool as soon as I get my hands on some. I hope that'll tone down the PRAP-PRAP a bit.

[crazydiablo]

You finished your run in so fast?

[motorhead]

Jetting for pipes is one of the most difficult tasks. ANd doing so on the non powerjet VM carbs will be more so. I believe you've put flatslides on your setup though, do they hve PJs? Zero in on the correct ignition timing for your style of riding first...then jet and always jet a bit rich or you'll be struggling with head leaks.

[ajaybiz]

I think 12-14 is quite OK for chanbers isnt it?
Just curious how the sounds at idealling, during accelration and at power band, share some video or just sound file.

[chinoy]

best ask cheif he has a programeable unit and has taken the max advance up from the run in value of 14 deg.
I would say increase bt 2 degrees at a time and see.

[torqu3e]

A jetting tip i can give which i noticed with and without pipes, when you are running a pipe and if you jet the carbs for the pipe, forget about any kind of throttle response when the bike aint on the pipe, and if you jet for throttle response for outside the band, the bike wont even get into the band properly it will go so lean.
Thats why Power jets will help you a ton in this case.

[vivekjayasheel]

These chambers are different man. Unlike some of the other chambers that I have tried, the throttle response and pick-up before the power-band kicks in, are almost as good as what I got on stock pipes. And I am sure it will improve once I get the time to time and jet her properly.

It's frustrating to be stuck with shit at work, while there's a monster waiting to be tuned at home.

[vivekjayasheel]

Ok I've advanced the ignition to the point where the pickup and throttle response BELOW the power-band is the SAME as that on stock pipes.

The hit in the powerband has become more vicious. And now there is a SECOND hit that is wilder, approximately 1500 to 2000 rpm after the first one (can only tell by ear, tacho not installed yet).

Am I on the right track? I'm using Mikuni 280s (SLIGHTLY smaller than Ron's 250s), and timing is somewhere between 18 and 20 degrees.

Took the highway route today and DAMN, she just FLIES when she comes on the pipe. I don't think I'll ever find a road long enough to see her on the pipe in 5th or 6th.

Should I go leaner on the mains after I switch to Motul 800 Factory Racing?

[chinoy]

Plug chop time.
Actually Im not 100% sure if these pipes where run with static or variable timining.

So try 20 deg with both curves to see what works better.

[vivekjayasheel]

Plug-chop revealed a dark-brown plug tip with a nice thin white ring. The inside of the plug stem was slightly darker.

So I down-jetted to Ron's 220s. Now the pipe-kick has become MORE vicious and she revs out a bit more (no tacho yet so actual figures not known). Fin temperatures are unchanged...

[madmaxarjun]

some pics ????

[nav75]

What do the butt dyno has to say, in case it is able to remain on the bike

[vivekjayasheel]

Butt dyno is happy from the feel of seat sliding forward from under it, arms are happy to keep getting yanked out of their sockets, eyes are happy to be watering and seeing everything in tunnel vision every time she "hits the pipe", only ears are unhappy because I'm going tone deaf.

I am also dead sure I haven't tapped into more than 60 or 70% of this setup's capability.

Plug chops don't help much because the goddamn CDI burns up everything you throw at it. So whether I use 220 or 280 size jets, the plugs look the same.

[nav75]

Butt dyno is happy from the feel of seat sliding forward from under it, arms are happy to keep getting yanked out of their sockets, eyes are happy to be watering and seeing everything in tunnel vision every time she "hits the pipe", only ears are unhappy because I'm going tone deaf.

[vivekjayasheel]

Update: The jetting that FINALLY seems to work at the timing that I am happiest with, is 15 pilots and 180 mains. She's FLYING really hard now.

Even 2nd gear power-punches are scary, and there are literally no roads around to do that in 3rd. The single Avenger front-disc feels inadequate.

Heads are cool when running but heat up once I switch off and stand the bike after a run, so I think the timing is not too aggressive. Will post pics of the bike soon. No pics of the pipes though, without permission from the big guy.

[crazydiablo]

Dont run lean...you will hole...it will rev much better but you have the risk of holing.

[chinoy]

OH forgot to mention.
With pipes you need to up your heat range.

You may also want to experiment with the sprockets.
One tooth down on the rear sprocket would be nice.

[rahulsharma_7]

hey guys.. need some help to understand.. is the pipes made out of steel.. better ones..than the normal materials used.. sorry to intervene here. didnt want to start a new thread..

[chinoy]

Go ahead and post the pics man.
cant tell anything from th pics the real magic is hidden

[vivekjayasheel]

CDI-III update: Curve 2 isn't helping much with the detonation even on the most retarded position on the base-plate (around 14 degrees) and Speed-97 fuel. But it makes the bike run much better on stock pipes, than the older CDI box I had.

If you ever make a programmable box, I would like to queue up for that one.

The only option I have now is to drill out the plate holes for more retard and then run the chambers. But that takes away the fantastic low-rev response (which is better than stock pipes if I keep it at 20 degrees max advance).