Project 90 (Stock 89cc And Beyond)

[90GTVert]

Cool, thanks. That would probably be the smartest solution anyway I guess, since every 1E40QMB regulator seems to not work. Replacement would be way easier... and I've got some just lying around now for future replacements too.

[Reign]

Those 1E40QMB regulators are a rare thing to find one that actually works. When I had my electrical issues, I mustve went through about 10 of them before I got one that actually gave me the right voltage.

[90GTVert]

Airbox Snorkel Removal


The original plan was to test a series of exhausts. That was rudely interrupted by carburetor issues. Now that those problems have been ironed out, I decided to see if there is any benefit from removing the stock airbox snorkel.


Removal is very easy. In some cases it may be sealed in. If your airbox is, you just need to use a screwdriver or sharp tool to free it up. If the snorkel isn't sealed in place, it should pull out pretty easily.






Here you can see the difference in size of the inlet with and without the snorkel. This snorkel on;y has roughly a 14mm opening. Without the snorkel it's around 22mm.




You'll get a throatier sound after removing the snorkel. It's not loud, but it is definitely louder. Nowhere near as loud as an open filter.




I had to upjet from a 78 main to an 85. I also had to adjust the idle mixture. Be prepared to re-tune your carburetor completely if you do this mod.


So was it worth the effort? I went for a 19 mile ride. Fuel economy stayed similar at 43.3MPG, riding a little more aggressively than the previous ride. It did feel like there was a slight power increase across the board. Nothing major, but any improvement from a free modification is a good one IMO. Max speed was 52MPH on GPS, my fastest speed to date with this project.


I'm not sure that this mod would work so well on smaller displacement minarelli powered scooters, but it seems to work for the 90cc. All future mods will be done with the snorkel removed.

[190mech]

I removed my snorkel early on with the 70cc kit,also hogged out the round hole on the airbox to an oval about 1.5 times the size and fabed a 2" tall snout to fit it with an old plastic car dealer tag and hot glued it there,still running that way today..Was not much louder..

[90GTVert]

The weather is not great, but I have at least straightened out the regulator/rectifier issue and posted the info in case it'll help someone else.

49ccscoot.proboards.com/index.cgi?action=display&board=igneleclight&thread=1795

[190mech]

Great info as always Brent!You take the time to document work to help others!!THANKS!!! :thumb:

[reveeen]

Good info.... makes you wonder though..........

Are you buying "generic" Chinese pit bike/ATV regulators, or maybe Honda type (from the 70's) regulators?




(Diagram courtesy Lynn Edwards)

[90GTVert]

That diagram means nothing to me I'm sorry to say. Electronics to that degree just baffles me. :sos:

All I know is that if you follow those instructions for a 1E40QMB and have a generic rectifier sold for that motor, it's likely it'll work. I think I have or had a pitboke rectifier around here somewhere. Never tried. Most of those seem to be designated with a cast in dot on the front as I recall.

[190mech]

Reveeen,the generic ones have a different pinout,positive and ground are diagonal on the connector,here is a pic of my revised CPI connector with a generic regulator;

Also thought I'd post a pic of my airbox snorkel mod;

[90GTVert]

You can be pretty darn sure there's no shortage of air getting into John's airbox.

Thanks for the pics. ;D

[90GTVert]

Phongeer Exhaust

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For this installment, I tried a Phongeer pipe. The pipe was purchased for another of my scooters and meant to fit a Jog style short case engine. This caused a couple of problems on this long case minarelli.


First off, I couldn't get the exhaust to bolt up properly because it hit this tab on the bottom of the engine case.




I noticed that the short case engine does not have this. I have no use for it, so I chopped it off and filed the edges smooth.




Now the exhaust would fit, but once I had it lined up and bolted to the cylinder it wouldn't fit up to the mounts properly.




I ended up making a bracket to bolt the pipe up securely while keeping it aligned with the cylinder's flange. I had to do the same thing, although the bracket is slightly different, for the short case engine this pipe was on.




With that out of the way, I finished up the installation. Nice looking piece.




Here's a sound clip. The pipe is very quiet. Not much different than stock. A good choice if you don't want to attract attention.




I increased the main jet size from 85 to 90 and made a slight adjustment to the idle mixture setting. On test rides for the jetting, I noticed that there wasn't as much of an increase in acceleration as I was hoping for. I swapped to 5 gram sliders, from 6g, and acceleration was greatly improved.


I went on a 37 mile ride with the new pipe and tune. The acceleration is a welcomed change. After about 7,000RPM the power increase is really noticeable. Power extends up to the mid 8,000RPM range, seeming to max right around 8,500-8,600RPM. Cruising speeds greatly increased. With all past mods, reliable cruising speeds have been in the lower to mid 40MPH range for me. With the addition of the Phongeer pipe, cruising speeds increased to mid 40s up to about 50MPH depending on conditions. Max speed was 53MPH, only a 1MPH increase. Fuel economy was the best to date for this project at 48.9MPG. That surprised me since I was actually pretty hard on the throttle on this ride.




The max RPM was around 8,850RPM to achieve 53MPH. That's definitely above what the pipe and engine combo likes at this stage, so I thought perhaps I could squeeze out a little more speed with heavier sliders. I swapped in 6g Dr Pulley sliders again and took a quick ride. Once again acceleration decreased dramatically, and top speed stayed the same. 5g sliders would definitely be a better choice for this setup for improved acceleration and responsiveness.


So, the Phongeer exhaust didn't show great increases in top speed. 1MPH doesn't sound very impressive. However, the pipe gives a very nice boost to usable power to increase acceleration and cruising speeds. I believe it to be an excellent stealthy street pipe. Nothing flashy to make most folks think anything of it, but nice gains in the right areas to make riding much more fun than before.
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[reveeen]

Are you going to try a chamber on there? (not something "fancy", meaning crazy expensive, something in the $150-200 range), and are we willing to explore different muffler packing?

[lshigham]

Fair play, that is a sleek looking exhaust you have there.

[90GTVert]

May 15, 2011 4:49:24 GMT -5 reveeen said:

Are you going to try a chamber on there? (not something "fancy", meaning crazy expensive, something in the $150-200 range), and are we willing to explore different muffler packing?

I was in the garage till about 2AM last night putting on a Leo Vince ZX. ;) Not tuned or anything, but for some reason I had a desire to install an exhaust in the middle of the night. I'd love to do more, but these things aren't cheap and that's all I have around. I do have a beat up MRP 70cc pipe and a Leo Vince SP3 for a 50 or 70cc. I could give those a shot and see how they work I suppose. I've suspected smaller pipes of causing overheating problems in the past, but I don't think I've ever tested on on a setup known to be OK.

As fas as muffler packing, what are you interested in? I've repacked silencers a few times before. Makes more difference in sound than anything from what I've seen, although I remember others saying it can have an impact on performance if it's burnt out. The Leo Vince actually has FMF 2 Stroke packing in it now. The original is long gone since there's a lot of miles on the pipe.

EDIT : Oh, I do have another pipe, but there's just no need to try it on this. I have a pipe from 190mech that's on my 103cc. That thing is nasty, but it's just starting to hit where this engine is running out of steam. I could do it no justice with this motor.

[2strokd]

Great updates and results :thumb: . I like the stealthy exhausts for the daily driver myself. Just installed a Leo SP3 on my Cobra last night .