The most sensible, and value worthy upgrade path for a Spree, is outlined in the wiki here.
http://hondaspree.net/wiki/index.php5?t ... _and_Spree
If you want to make your Spree go faster, follow that path in the correct order and you'll be good.
To break that down, it's
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Step 1:Enlarge stock manifold (skip the Pulley mod)
So before you try anything else, give the Spree better intake lungs. Thinking of a better pipe? Maybe a BBK? Bigger jet like a #68? All 3?? I like you all ready, welcome to the world of the Spree. So, no matter if you do one and a combo of any of the other of these things, they each have 1 thing in common with each other. They would ALL benefit from having a better intake system, so START THERE. You can get to the BBK, GEARS, MLM, ETC,ETC, CACHING, CACHING later. Either take your own intake, or buy a cheapy off of eBay to practice on, get a dremel with a cone stone wheel, and port the intake yourself. Don't waste 1 more dime trying conventional tricks on a quest for "keeping up with traffic", or the ever elusive wheelies. It's all gonna come down to your intake. Start there, or swap it out now for an AF16/DIO. Sprees don't go fast, they run well. You have to bring the engine up to the level of the Elite E first if you want more performance. If you have no way of doing this, then DO NOT upgrade your Spree anymore. Safe bet, is preserve that engine, and maybe wait for Taz?? You'll really gain very very little going forward, unless you address the intake system of the Spree. You start where HONDA started when they took full advantage of the AF05.
Info on porting is found in the wiki here:
http://hondaspree.net/wiki/index.php5?t ... _the_Spree
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Step 2 Mill head / increase compression
This step can be skipped for the most part, but it does play a key role in final compression. If you recently won the Megamillions jackpot and live in Illinois, and can afford to have it done, then don't play games.. Use the head from an 84-85' Spree, and lets get some precision milling done for an awesome squish!! Otherwise.. meh.. skip it, your good.... moving on..
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Step 3 Enlarge exhaust port
Step 4 Construct expansion chamber
OK, NOW, we can talk about your muffler kid.. er.... 40somethingish dude/chick.. who cares? But anyways, so now that the intake was taken care of, hows that Spree running now that you've been riding it around with that intake revamp and cleaned out muffler.. You DID clean the muffler already right? Of course you did, just asking. Go bold, or go home on this one. Swapping an 84' muffler for an 86' would only be for aesthetics. No real gains worth writing to grandma, who gave it to you, about. Again, think to yourself.. hmm, what would HONDA do? That again, means for any real gains, you must bring it up to the level of the Elite E. Not in the budget? No big deal, a CLEAN muffler that has been BBQ'd should perform just fine for your needs. Skip it, but keep it in mind. But got some cash to "LITERALLY" waste, You can test out your high school Junior year shop, welding skills, spend 50 buck on a
Jiang Wayne pipe, hack it to fit the Spree, and get HONDA type performance, or REALLY go on a (spending) SPREE, and buy an
MLM people's pipe with a tuned expansion chamber.
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Step 5 Upgrade to SB50 manifold and reeds
OR... get a better reed system when you take care of step 1. At this point, you have either already saved yourself a step by doing this in step 1, or you call this the next step. Look for SB50 reeds, which are often sold on eBay as "SPREE REEDS", read the wiki and learn the difference and what to look for.
http://hondaspree.net/wiki/index.php5?t ... _the_Spree
The object here, is make sure the AF05 block that came stock with your Spree, can get full advantage of a more open intake system. By now, your Spree should be running like a beast if you have completed these steps. You'll find it is so much more robust. One thing to note, up until this point, you SHOULD be using your stock air box with a clean filter. After completing the steps to allow the Spree to breathe better, you may now experiment with aftermarket pod filters. You may now consider a bump up in the main jet size. Largest size Honda used was a #68, you may be able to use a #70 or higher with a pod filter. Please note EVERY engine that you come across, will probably need a bump up higher in the main jet if you switch to a pod filter system. It is still however, recommended that you preserve the air box system. You may be able to let it breathe better with some small holes drilled in the airbox since it can now breathe better with intake porting/change, but do not drill or modify your airbox unless you have performed step 1&5, and only do so with small holes placed close to the normal inlet on the lid.
All THAT is done and done?? Good, NOW, next step..
Time for a Taz kit friend.
http://www.ebay.com/usr/chopchop*123
I honestly wouldn't buy one, unless FOR SURE, step 1 and 5 are done and done. Got it handled? The Taz BBK, will now be able to unlock some fun on stock gears. Whatever top speed you are capable of with it, you should, at this point, be already able to achieve if you have already followed steps 1-5. The BBK, is gonna make hitting that top speed so much quicker. Your jetting will change at this step. You'll have to fine tune it. If your 25mph Spree only gained to 30mph, maybe 32+ by doing steps 1-5, then keep the BBK expectations in that speed range. Low geared Sprees ( 84'-85'+All Year Iowa Editions) are the most fun for take off with a BBK. Mid gears like the 13T (86'-87' non-Iowa Edition) are the most street worthy for in town. Should be good for 35+. High gears get you past 40 with awful takeoff. Don't even consider the next step without doing step 6 first.
P.S. Welcome to the 4HP+ Club. Ain't it a blast!!
We had a classic car and bike rally in town the other day, so mine wasn't the only one cruising. I'd be at the stop light and I could twist the throttle and be able to lift my (300+lb fatazz) feet up to the floorboard without having to give it a Flintstones push to keep it going, but acceleration from a dead stop will annoy people in back of you slightly, at least till you pick up to 10mph, then it flows well into traffic at 40+. Great for long stretch driving, terrible for block to block traffic lights. My skinny 115lb daughter can get on it and just GO!! For a realistic speed boost, skip the fries with that cheeseburger fatso. It's a Spree, you got 1 gear, choose high or low, you can't have it both ways and that sugs the big one. Myself personally, I chose BOTH ways. Of course... took me 2 Sprees. 1 for congested driving, 1 for open. If ever there is a time you should rethink by saying "keep up with traffic", it would be now, define "TRAFFIC"
Congratulations on making it to this final step. If you were an idiot, and went out and bought a brand new carb instead of redoing your stock carb, you kind of wasted some money. I hate to bring this up now, but you do not need a new carb to do steps 1-7. Step 8 can, and can't make much of a difference, depending on it's application before hand. For instance, lets say in step 1, you decide you want to upgrade the intake to an SB50 intake, which only has 1 hole for vacuum. Upsizing/upgrading the carb in that case, helps. A Polini (17mm MAX) carb, has the needed extra nipple for feeding the oil pump into. You simply hook it up there. Otherwise, you need no other carb to run a well ported Spree intake system with SB50 reeds.