J-Madd

All he tunes IS clutch. No carb tuning, no tire pressure change, no tire paddle or rollout change, no gearing change. I think he could try some different things before always going to the clutch on dirt tracks where it's different from pass to pass, but I can't question his methods really.

You can run an extension through both rods and hit that nut with an impact.

It makes 20+ more hp than my 421 on his dyno and probably weighs 40 to 50 lbs less.

While we're talking about hp to weight. I can give examples of mine. Scimitar 0.36 hp per lb. 650 cc bike (estimated by me not dynoed). 0.34 hp/ lb 10 Mil Cub 0.28 hp/ lb 4 Mil Cub 0.26 hp/ lb Menz's 421 Cub. Estimated by me. 0.37 hp/lb. he thinks it'll go 3.4s in 300 ft and I think that hp to weight is why he thinks that. Sorry it's off topic of 1/4 mile racing.

I don't port engines but we run Drag Race motors. I'm not sure the road race European motors would apply to what we do. Id like to know are what you're talking about in the exhaust port, though. I can't picture it.

That's at several thousand RPMs more than a good Banshee. You'd need a 10 speed tranny if a Banshee rapped that. I'm sure you could almost make that power to cc ratio but it would only be a dyno queen.

200s wheelie FTW.

The transfer area: bore ratio is huge. That's hard to do on a Banshee. Even spread bores don't have that much transfer area relative to the bore. .

I have BB SF Silenced Shearers chrome out each side.

Gotcha this guy I was talking about ran 5 on a 6 spring setup.

I don't mess with the clutch much, but when you take a spring out the pressure plate won't come out evenly. I wondered about guys that did that and said it was about total base pressure and not the number if springs.

I'd send it to a builder if I were you.

http://justyamahard350.com/ This is some old information, but a pretty good read. I can't believe I hadn't ran into that site before.

The light weight rotating assembly sounds good and and all, but that would be the same as running no flywheel mass. The crank weight doesn't hurt anything especially on a twin. The energy stored from the weight of one rod/crank wheel going up is put back into the rotating assembly when going down. It doesn't sound right I know, but I can provide a link to information on this from experimentation on the old RD 350s.

^^^^^^^*

I have chrome BB SF Silenced Shearers out each side. $400 Shipped.

If you put the snows on a wider wheel where they hook better you loose the growth. Kind of a double edged sword.

I have the trinity on my Challenger R/T also. The Dodges are a limited on the tuners anyway (at least back when I was in the forums) and the Diablo guys had it figured out better than others. On other motors I figure there are more options. If you can dyno tune you can use the hand held to adjust timing/fuel, but most good shops can custom tune the OEM ECM (or whatever) without it, except the Mopar motors.

Thanks, I may try them out.

That's pretty impressive.

What was the squish with the old domes? Saw another thread where "registered user" mentioned tightening the squish to get rid of deto, so I researched it and it seems that is a good idea. It does raise MSV which can lead to deto if it is too high though. You can run a lot less squish than that but it's gonna raise the compression too and lower port timing if you just do it with a base gasket change. Big bowls shouldn't be needed if you're filling the ones you have, as n2o suggested. I'd start with pulling timing even more until the problem stops assuming the bowls aren't running dry. I have a motor that rattles plugs loose every pass and have tried everything. I detuned it so much it wouldn't run but still rattled plugs. My next step is new domes and/or tighten squish. What did you say the squish band is? Smaller = less deto prone in general.

He's probably talking about the Aprilla tuners.

But the lockup isn't moving until the clutch is disengaged unless riding the brake. He's already running stock springs, that's what makes it hook off the line.

X2. Also increase tire pressure. I'd do a lot of different things before I started cutting or taking out springs. For fine tuning maybe but not just to stop a bog. Could also be a tuning issue as mentioned.

$250 shipped to 63857 and I'll take them. Tried to PM from tapatalk but wouldn't work for some reason.