Getting the Tazland BBK, GEARS, + MLM ran on a dyno

[eclark5483]

Here is a screen shot of the 3 holes that were drilled.

[Meatball]

I modified my pod filter to restrict some airflow and add back pressure. Its kinda hokey but I think Im getting close to where it will work with my Elite motor. Only reason Im doing this is the delete the stock airbox so my Spree plastics will fit on. I'll get pics up as soon as I have time but I know for sure that an un-modified pod filter for my motor was just not working. It would idle fine but would choke/sputter on take-offs. My prognosis was that there wasn't enough back pressure for the reeds to pulse correctly. It acted like an old Buick I used to have that needed the timing adjusted constantly. That ended up being a loose distributor hold-down bracket causing it to retard every time I drove it!

[Meatball]

So heres my crazy pod filter idea. It has a Dasani Water Bottle cut in half and slid over the filter to restrict airflow. I left it long enough so theres about a 1" cavity at the tip. I cut the end off but leaving the curl part of the bottle. I cut a spare Spree filter in half and fit it into the cavity(curl holds it in) to create additional back pressure but still allowing(what I think)is proper flow. If I needed to add more flow I can just add holes into the sides of the water bottle along the pod body somewhere. If I need to add back pressure I can add the other half of the Spree filter into the end. Its not pretty but Im very close to getting it to run right. Of course, I don't have a Dyno so Im acting on trial and error.

I only bring this up because youre about to try a pod filter and this is an easy way to make adjustments to it if need be. Theres a good chance it wont be plug-n-play right outta the box! Some people use electrical tape but on an oiled filter it doesn't stick too well. Plus when you tape/un-tape your filter a few times theres a good chance of ripping the foam...then youre hosed!

[eclark5483]

It's something to keep in mind, but I don't think we will be trying it. I'll leave that up to the ones who wanna get every last bit of performance out of it that they can squeeze. Restriction lowers stoich, this has been proven, but at a loss of a bit of grunt power. Good luck finding the balance in that. I'd start with 3/8th's inch holes. I'm going to be adding just one more 3/8th's hole so I am right about where Ultraliner is with 2 20mm holes and see where that takes us. On one hand, no air restriction makes it take deeper breaths, but some restriction keeps the power band more in check and gives you better stoich for power and cooling. Can't wait to see where this goes with a bump in that jet.

[eclark5483]

But anyway. This is the filter I will be using:

https://www.amazon.com/gp/product/B000OO4PDK/

And, if the air filter proves to be the winner, I'll have my first extra decal (UNI) to place on it.


If airbox wins, I have a decal for that too.

[Meatball]

That's the one I used but I went with the angled one. I wasn't sure if the straight one would clear the shock and wanted the flexibility to rotate it out of the way if needed. Its actually much larger in person than I thought it would be. After the rubber part, the foam itself is about the size of a can of Spaghetti-o's.

[eclark5483]

Do you have a link to the angled one?

Vials came in today, Very nice, perfect size to have 1 or 2 of them in the trunk. They have 2 markings on them, one for 15ml one for 30ml, I'll have to measure with my syringe, but I think filled to the top, it's probably 45ml total volume. Looks like it shoots you maybe 5 more ml before it touches where the fluid is no longer visible. So I'm gonna call that the "oops" range. So 35ml "OOPS" gives me a ratio of 108:1 in the tank.. so.. d*** math again.. 108+32=140*2=70*2=35:1 effective oiling ratio. Filled one up with a bit of water and had my daughter hold it upside down. No leaks. Have it sitting upside down on a napkin on my desk, seems legit. Think I might stick with taking it down to 35:1 rather then 40:1. That ain't quite 32:1, and at this point I wanna say for anybody else, 32:1 is probably where you want to be, but because it will be easy to do with the vials, just open the oil bottle, start pouring till you get almost to the top. I'll figure out where 32:1 (39.4ml) is on the vials later, but if it's an actual 45ml total volume, it has potential to saturate (84:1+32:1= 29:1) if you REALLY REALLY fill it to the brim.

[eclark5483]

So here is what I am thinking with the vials for gas station fill ups with no gas can. He'd have to only fill up when it is getting close to "E", and if he is going to do it at a gas station pump, then he can only put 1/2 (.5) gallons in the tank, then pour in one of the vials that is marked at 15. Finish with a fill up at home with the 96:1 vial. I think he can get that.

GAS AND GO!!!

[eclark5483]

BTW, in case you are wondering how that would work out if you ran only premix, 2 vials both filled to the 30ml mark will get you there if you only fill exactly a half gallon then drop them both in. Might help you premixers out knowing that if premixing is a pain.

[Meatball]

Unifilter part # UP4112-AST

https://www.amazon.com/Uni-2-Stage-Angl ... =up4112ast

[eclark5483]

Looks like I have some video watching catch up to do later tonight!

Good to read you had slightly more positive results with one of your 3 airbox holes covered up too, consistency in findings is a good thing!

I think I asked awhile back(cant remember)but are you running with the main that came supplied with Taz's kit? I think it's #90?

Doesn't matter what MINE is running at this point, and yes, it is a #90 for now. What are YOU using for a jet size?

[Meatball]

If you need some jets I have #85, #87, #96 and #100 that fit the stock Spree carb. Id be more than happy to donate them to the research if you need.

[eclark5483]

Thanks, but Taz sent me some things. This is his baby I'm torturing.

[Ultraliner]

Yes am running the jet that came with the kit which is an unconfirmed #90

I have a few larger sizes to play with when the weather sorts itself out. Spring in New Zealand at the moment seems to consist of 7┬░c temps and hail

So youre going to try 4x 9.5mm holes next? Interesting noticing the increase in low end pickup with your running no airbox lid vs airbox lid with 3x holes ... The spree likes to breathe huh!

I'm surprised how poorly it preformed with 1x 9.5mm hole(36% increase in airbox inlet diameter)but I guess there are more than a few things at play here

Much respect to you for going to all this effort to get your son a reliable ride that he will love(and for the hondaspree community too). You are a top man indeed

[eclark5483]

The way it's looking to me so far. If you want the BBK to have better pickup, go with the pod filter. If you want to run it at higher rpm/speeds for an extended period of time, use the airbox so your stoich ratio is better and it can use the fuel's cooling properties more efficiently. We saw in "3 holes with oil" (I know, sounds like the title of a pRon ), that it will hold at 35mph at about 13.1. It's too bad I chickened out at 8700rpm, would have been nice to see where that was sitting at around 10 grand. If a bump in main jet keeps that stoich hovering between 12.0 up to 12.5 WOT, you know you are getting probably about the best WOT run cooling you're gonna see. I'm guessing BBK, with higher gears and MLM is probably most comfortable riding 35mph, which might be perfect for most people. It can achieve the higher speeds probably pretty comfortably, but there is a strange "bump" issue like Jumps was talking about that might be there when the BBK starts tapping out. And it GETS THERE easier with less restriction. So I think it now becomes a personal battle, of do you want to get there faster, or would you rather it stays there longer once you do get there?