DASA Pipe/ Stock Bore/ graphs

[wppracing]

The Mods are ;
2004 WppRacing TRX450R , DASA Pipe, Dasa Air Filter Kit, Baldwin 14.1 Piston, Baldwin Valve Spring kit, Ported Cylinder ( mild port clean), Megacycle X2 Cam, HRC Needle, 50 Pilot, 182 Main Jet.

Runs 93 and 94 are with this set up.

The graph read completely for run 94 and then interference was getting picked up.
Runs 112 and 113 are with a 185 Main

The part I like the most is how the TORQUE hits hard down low and holds on longer.

The graphs have a break after 6k and then picks back up again.
I know now it isnt a DYNO concern but a interference problem with my quad

In RPMs you will see 94 is complete and 93,112,113 have the break.
Then in RPMs the HP stays the same and the TQ read lower for 112 and 113 because of the interference.

I am replacing the complete wire harness and rectifier to start and go from there.

We did a Banshee next and it did the same thing after 6k. But in MPHs it worked fine.

I am very happy with this set up - BIG BORE power from a STOCK BORE engine:macho

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[machwon]

I would try a stock needle or a large main jet. Anytime I get "interference" like that it is a jetting issue. I doubt its electrical. Sometimes you do get electrical interference with the plug wire hookups, but it usually locks of the dyno software. Hope this helps.

[wppracing]

Sometimes you do get electrical interference with the plug wire hookups, but it usually locks of the dyno software. Hope this helps

Thanks. It did lock up the dyno software awhile back. How would it be a jetting concern?

[machwon]

Its right about the point where the motors getting the biggest load and will take the most fuel. Several of the motors I've dyno'd had the same issue and was resolved with 3 sizes larger on the pilot. Its like you roll on the throttle on your motor and it blubbers (too lean or too rich say), the dyno wheel loses its momentum resulting in a momentary loss in power. since the wheel was losing momentum the graph point would acutally be off the bottom edge of the paper.

[Mobile Dyno]

:rolleyes: :confused: . Its an electronic issue not jetting. Jetting wont cause electronic interference.

[machwon]

And interference won't cause your motor to fall on its face. So please explain.

[Mobile Dyno]

Who said the motor fell on its face? The graphs shows a cut at 6-7k rpm. The bike didn't fall on it's face. I'm saying jetting has nothing to do with a tq graph having a miss in it. And if you had to go 3 pilot sizes to change your low end a/f ratio, then you had a jetting problem. Tq is being read from the electronics of the bike... hint(plug fires). Its a Grounding issue or an electronic issue with the bike. This bike has had ALOT of dyno runs on it and has never had this problem until the past couple of times.

[kgbg]

The RPM pick up needs to have a long signal to sample, sometimes when the bike has a stumble or hesitaton the RPM will change to dramatically for it to read accurately.

[Mobile Dyno]

The bike didn't stumble or hesitate. Do you think Dielectric grease in the connector of the cdi had anything to do with? :eek:We had another 450r with similar mods and had no troubles out of it. I have done several bikes after the last time we did this and saw this problem on his and before this past time with no issues but on his.