SlowerThanYou

Who are you asking?

I gave the ratio we have ran. Your 17/40 is a 2.35 ratio; you divide the larger sprocket by the smaller one. As for you not being concerned about power, our quad dyno'd 10 hp less than yours. As for the timing curves and dome cuts, that's for you to figure out. Now, for the gear gear ratios I told you we have run. It will take a lot of clutch tuning to make them ratios work. I've given sound advice for the gear ratios and tire size. The rest is up to you to figure out how to make 10 more hp go faster

We only have about 125 runs on the +14 vs. around 600 runs on the +8. With the shorter arm 95% of our focus was 1/4 mile. With the longer arm 90% of our focus was the 1/8. The longer arm is faster/quicker.

Here's an old slip accomplished with 230 lb. rider, stock frame (335 lbs), 443cc cub on race gas and no power adder.

You are a little off, we run anywhere from a 2.05-2.17 ratio depending on different factors. Part of the problem is your tire size. You can run High 9s to low 10s on 20X8X10s. There are many other factors key to fast 1/4 mile times like: timing curves and dome configuration to name a few.

#3 There's another key area the photos don't show, but the upper & lowers bars are two different diameters.

#2 pic

We are 230 lbs with full leathers. Our 1st swingarm was a +8 aerotube and it was violent out to about 330'. Plus, we are running a lot smaller motor than yours. Our new ladder is + 14 and is very smooth and there's no geometery issues under power. We had it built with a torque bar for insurance. The last 40 or so runs have been run with out the torque bar. We have had no issues in either configuration.

Swingarm length will be dependent on your weight. IMO it shouldn't be shorter than 10" over, but could be longer depending on your weight. We run a ladder style that's designed a little differently and works good. We didn't see where it provided more traction over our standard aerotube design. The biggest problem is the chain pulling the swingarm left under power in the lower gears. A properly designed swingarm will prevent that.

Generally around 5lbs. works, but you will have to play with the pressure in either direction. There are some safety concerns going below 5lbs. We have used between 4.5 & 8 lbs. That tire is pretty large, you must have a bigger motor?

It's not just about the CC size.

patsbansh, 1/4 mile tuneups is a totally different than most set-ups. There are very few people that do it well and are fast. If it was as easy as everyone thinks; then everyone one would be doing it.

patsbansh, 1/4 mile tuneups is a totally different than most set-ups. There are very few people that do it well and are fast. If it was as easy as everyone thinks; then everyone one would be doing it.

IMO you have the wrong lock-up for asphalt racing. Clutch tuning is one of the key factors to being fast on asphalt. The slingshot is going to be a bear to making quick clutch changes in the pits.

While there are many factors that go into the dome set-up. Your answer will probably lay in between the two extremes. It will still come down to you trying different dome configurations to see what works best for your set-up.

We run a 20" diameter by 8" wide American Racer and that will work for a good majority of set-ups.

I'm not a big fan of Dyna, but the same ignition has been on our quad since around 2000.

I've been drag racing too many years and a launch limiter is key in many areas. Here's a couple of examples: clutch tuning & reaction time consistency. It can be a handy tool for other things also.

We use a adjustable switched clutch lever. It can be bought from MPS or Pingle Racing. The non adjustable will work, but not as well as a dialed in adjustable. As for your second question. IMO you should start out on race gas, but to each their own. As for doing them all together, that's your choice. As for the adjustable timing plate, we leave ours at 0 degrees. Every once in a while we use it for a quick adjustment on the timing.

Simple answer, yes.

The gearing may or may not be right. Depending on your primary gear ratio, over all weight & density altitude. To name a few things to consider. I would look at changing your rear tires. If I'm not mistaking that is a 10" wide tire. IMO that's too much tire for that combination.

To each their own on the ignition and I'm good friends with Tedder. I run the Dyna ignition and it works great depending on what you are trying do. I'm deffinately not a fan of their customer service.

Thanks NYUK for the kind words. My PM is disabled, I'm more than happy to steer you in the right direction in open forum.

We don't post our times anymore, but I'll repost an old slip. This was done with a 1/4 mile set-up on a 330# stock frame, 7mm cub on race gas and a 220+# jockey. Your friends times are good.

I meant to also add, there are many other factors to get that speed. Timing curves, dome volume/shape, and shift points, to name a few factors.