WHAT THE FACK! ):

spree-rider · Post by **spree-rider** » Tue Jan 18, 2011 8:42 pm

Just got done porting intake. get it all back together and i put my airfilter on and it gets knocked off whenever you sit on it. so i made this extension tube. now, it wont start or even sputter over. And if i take it off it still wont start?

even tho before i put the extension tube thing on

pics will come very shortly.

spree-rider · Post by **spree-rider** » Tue Jan 18, 2011 8:56 pm

not bad for being taken with a phone ehh?

Spreetard · Post by **Spreetard** » Tue Jan 18, 2011 11:18 pm

First, you're question on the poll is not a yes/no question. Either answer could mean either one...

And I say keep it. Every winter, the people of the north tend to sell off their summer toys that they haven't ridden in months. Then every spring, they go out and spend MORE money replacing the toys they sold off than what they made. I see it all the time. You'll kick yourself later.
BUT... I'll tell you how to fix it....

#1- stock bore
The problem you are having is the fickle airflow tenancies of the spree. My spree, Ol' Red, has an unmodified stock airbox and lots of porting and polishing.

The tube connecting teh ...errr... stock carb tube to the ... ummmm, Arby's straw???? Err, gas can pour spout. Yeah, that's too small. you need to be at least as big as the stock tube, and not much bigger.
You've created a bottleneck in the intake tube by reducing it's inner diameter, thus restricting airflow. Your bike is on super-choke, drowning the plug in gas. The venturi of the carb is very likely not able to even function properly.

I have experimented with trying to remove the airbox, and though I did like the extra noise for a little while, it got really old really fast. It's like holding the throttle of a chainsaw at 1/2 throttle. In no way pleasing to the ear. And, after MANY re-designs, I arrived at a point where I had made a really loud intake that worked pretty much the same, as far as performance was concerned, as the stock box.

#2-Big Bore-
Well, ya' know how i said the stock bore cannot run with a bottleneck there? The big bore kits hardly run with the tube on at all. Put an UNI pod filter directly on the carb, and it should still fit under your panels (granted, it will rub a bit). Chainsaw noise is complimentary.

I believe that you have a stock bore (based off your sig) In which case the options are
A) Do extensive experimenting and tuning to likely have nothing more than the same speed with twelve times the noise.
or...
B) Put your stock airbox back on with a nice crescent fresh air filter in there all oiled up nice (but not too heavy).

I recommended the stock airbox. It is quiet and it works very well for 50cc bores.

I love the ingenuity though. The concept is possible, you've just hit an engineering wall. If you want to have chainsaw sound effects everywhere you go, I say take 'er back to the drawing board and eliminate the restrictions. Largemouth bottle? A tube that fits over the carb? You are a few prototypes away from having a workable base to tune on. But don't forget, as you change the intake, the jetting will in turn need to be adjusted and re-tuned. If your bore is stock, You will have a hard time out-engineering Honda-san. The stock airbox is not a weakness of the spree until the displacement of the engine is increased.

spree-rider · Post by **spree-rider** » Tue Jan 18, 2011 11:28 pm

3.0 tire restricts air box. Thanks for the detailed respons. Tomorrow I shall figure something out. And yes it is a gas can filler tube thing

spree-rider · Post by **spree-rider** » Tue Jan 18, 2011 11:57 pm

I figured out what was wrong. /: the ignition came unplugged

808BMW · Post by **808BMW** » Wed Jan 19, 2011 12:34 am

spree-rider wrote:I figured out what was wrong. /: the ignition came unplugged

Lol, basics first! The plug/coil should have been the 2nd thing to check when it doesn't start (1st would be the gas tank

)

Spreetard · Post by **Spreetard** » Wed Jan 19, 2011 12:53 am

You still may need to adjust the main jet in the carb to compensate for the increased airflow. Without doing that, the carb may lean out. Or it could be too rich from the smaller inlet tube. Or perfect for that matter. It could run lean down low(when not drawing air as hard) then transition to running too rich at the top end due to the restriction. Who knows?
Remember to monitor your engine when making tweaks. Lean is mean, but at the cost of burning up engines. Plug chops and CHT gauges are very handy.

I've fit an 80/90 tire under a stock airbox with great success (though it did rub the shock a tiny bit...). Pulley and clutch mods will gain you alot more speed than the tire size. The net gain from a 3.00 rear tire over a 80/90 is less than one mile per hour, on the assumption that you can turn the engine at the same RPM with the new intake system you've built.

spree-rider · Post by **spree-rider** » Wed Jan 19, 2011 1:28 am

I hadent pulled the plastics of before I posted. Spreetard, I have re jetted. And I rode last night for about 2 miles and it seemed a little faster, and same rpm range just by listening to the exaust

spree-rider · Post by **spree-rider** » Wed Jan 19, 2011 1:29 am

Spreetard wrote:You still may need to adjust the main jet in the carb to compensate for the increased airflow. Without doing that, the carb may lean out. Or it could be too rich from the smaller inlet tube. Or perfect for that matter. It could run lean down low(when not drawing air as hard) then transition to running too rich at the top end due to the restriction. Who knows?
Remember to monitor your engine when making tweaks. Lean is mean, but at the cost of burning up engines. Plug chops and CHT gauges are very handy.

I've fit an 80/90 tire under a stock airbox with great success (though it did rub the shock a tiny bit...). Pulley and clutch mods will gain you alot more speed than the tire size. The net gain from a 3.00 rear tire over a 80/90 is less than one mile per hour, on the assumption that you can turn the engine at the same RPM with the new intake system you've built.

And the tire and rim was free!

Spreetard · Post by **Spreetard** » Wed Jan 19, 2011 1:41 am

Just wanna make sure the bases are covered! A new plug to monitor the air/fuel ratio would still be a good idea! somewhere, bear posted a nice chart of plug chops. Mayhaps he will share it again...?

spree-rider · Post by **spree-rider** » Wed Jan 19, 2011 1:45 am

YEp, I put in a new plug, the old one was PERFECT.

Cardboard color

Seen any digital chts on ebay lately? No vapors. Im on a budget.

Bear45-70 · Post by **Bear45-70** » Wed Jan 19, 2011 1:51 am

Spreetard · Post by **Spreetard** » Wed Jan 19, 2011 1:53 am

Trafficjamz has an analog gauge on one of his bikes. Not quite sure where it came from, but defiantly cheaper than the vapor by alot. Lemme dig around or ask him...

Oh! Hey! That chart I like so much! Thanks Bear!

spree-rider · Post by **spree-rider** » Wed Jan 19, 2011 1:54 am

IT was number 15

spree-rider · Post by **spree-rider** » Wed Jan 19, 2011 2:01 am

Spreetard wrote:Trafficjamz has an analog gauge on one of his bikes. Not quite sure where it came from, but defiantly cheaper than the vapor by alot. Lemme dig around or ask him...

Oh! Hey! That chart I like so much! Thanks Bear!

Thanks dude! But were to mount on a spree?

Honda Spree and Elite 50 Forums

WHAT THE FACK! ):

keep spree. Or sell for $500 and put more money into my bug?

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