Speed Modifications for a "85 Spree - Are these Legit ?

[mlucia10]

1. Remove the head and have about 60 thousandths shaved off. 20 bucks labor and 6 bucks for a new head gasket. This will increase your compression for more power

2. Take a dremel to the intake manifold and open up the restriction, you will see it when you remove the manifold. This will increase air flow, more top end power

3. File about 1/16 inch off the front inside pulley half on the belt drive. This will slightly increase the drive ratio for a higher top end

4. Buy a size 70 main jet and install it in the carburetor costs about 6-10 bucks at your local Honda dealer. You will need this if go to an after market air filter assembly to insure proper air/fuel ratio

5. Buy the chrome topped cotton filter element K&N oil breather cap for a Chevy v-8. It costs about 12 bucks and it makes a perfect after market air filter. It fits right on the rubber tube that goes to the carburetor. You will have to remove some off the old air filter assembly though. This combined with the jet gives you more top end power and RPMs.

6. Drill out the exhaust. That relieves some back pressure for more available power."


For decarbonizing the muffler, would letting it cook over a camp fire do the trick and be safe for it ?

[Kenny_McCormic]

1. Remove the head and have about 60 thousandths shaved off. 20 bucks labor and 6 bucks for a new head gasket. This will increase your compression for more power BAD * NUMBERS THIS IS A MOD BUT .020" MAX !!!

2. Take a dremel to the intake manifold and open up the restriction, you will see it when you remove the manifold. This will increase air flow, more top end power I have done this it does help alot all around.

3. File about 1/16 inch off the front inside pulley half on the belt drive. This will slightly increase the drive ratio for a higher top end bad idea running a slightly wider 1/2 automotive belt will od the same thing.

4. Buy a size 70 main jet and install it in the carburetor costs about 6-10 bucks at your local Honda dealer. You will need this if go to an after market air filter assembly to insure proper air/fuel ratio Am filters dont do anything on a spree.

5. Buy the chrome topped cotton filter element K&N oil breather cap for a Chevy v-8. It costs about 12 bucks and it makes a perfect after market air filter. It fits right on the rubber tube that goes to the carburetor. You will have to remove some off the old air filter assembly though. This combined with the jet gives you more top end power and RPMs. Am filters dont work on the spree, its too picky.

6. Drill out the exhaust. That relieves some back pressure for more available power." This also works, drill 2 bffels by sticking a drill bit up the exhaust tip.


For decarbonizing the muffler, would letting it cook over a camp fire do the trick and be safe for it ? I did it, IIRC it came out unpainted but my memory around the time i got the thing is a bit fuzzy.

[noiseguy]

Can someone give me the link for this article? I need to edit it.

[Kenny_McCormic]

IIRC its sonicjays spree site.

[keithw]

In my limited experience here is what has worked for me. Pulled the intake manifold and smoothed out sharp edges and opened up a bit inside. Built a tuned pipe exhaust based on the calculator in the tech section. The top speed has gone from about 20 mph to about 25 mph. The engine will now turn a little more than red line (8000 rpm) running on the street. Jetting is not a one size fits all. Learn how the engine acts when rich or lean and read the plug. Jet to what your engine wants.

Currently working on air box mods. I've got 62, 65, 68 and 70 main jets in my kit. The 65 seemed lean, the 68 and 70 just arrived today so I haven't tried them.

Haven't worked on the belt trans yet. Since I'm exceding red line that is the next thing I'm going to look at.

Head milling, cylinder porting and ignition timing change are down the road.

I'm making one change at a time, understanding what I am doing and why, and measuring performance as I go along. Jumping in and changing several things at once is just asking for trouble. Sticking to the rated rpm of 8000 seems prudent. I suspect it could handle 10k but that seems like asking for trouble.

keithw

[Kenny_McCormic]

It should make over 25 stock, you have trans issues.

[mlucia10]

Noiseguy,

http://m.1asphost.com/spreerepairing/speed.htm

could somebody post a link for getting some bigger jets and how one should go about modifying their carb/air intake and manifold (with consideration for the oil mixture )

[Kenny_McCormic]

Noiseguy,

http://m.1asphost.com/spreerepairing/speed.htm

could somebody post a link for getting some bigger jets and how one should go about modifying their carb/air intake and manifold (with consideration for the oil mixture )

Bigger jets can be bough from honda, I think. manifold can be ground for better flow without oil flow worries.

[mlucia10]

Kenny,

You mean just going to any Honda motorsports dealer and ordering say a 70 main jet for a "85 Honda Spree is a safe bet, Or is there a website that i can order Honda OEM parts direct? I'm familiar with powersportspro.com any other you know of?

And what sort of discretion should i use when ordering a larger jet for a "85 Spree?

[Kenny_McCormic]

Dunno, Im unsure if you can or cannot get them, probably cheaper/better to buy a small * metric drill set (a 65 main is .65 millimeters) and a extra stock jet or 2, increase size until it gets to rich with needle set at richest point, then tune with needle. If you go too big you have the backup jet to drill a size smaller.

[keithw]

It should make over 25 stock, you have trans issues.

Entirely possible, haven't been into it yet. It's actually a Pal (JDM version) and I've not found how fast it should go. On the speedo it has a little red LED labeled "speed" that blinks at you when you get a little over 35 kph. I presume this means it's going about as fast as Honda intended for it to go. At this point the engine speed is right around 8000 rpm, the rated red line. These things lead me to believe that things are working reasonably well in the trans area. I will be the first to admit that I am almost totally ignorant about these things so I'm learning what I can from places like this and being conservative with the mods.

keithw

[noiseguy]

OK... this used to be posted on this board somewhere but I guess it's buried now. I know the guy that owns that site; I'll contact him.

Noiseguy,

http://m.1asphost.com/spreerepairing/speed.htm

could somebody post a link for getting some bigger jets and how one should go about modifying their carb/air intake and manifold (with consideration for the oil mixture )

[keithw]

It should make over 25 stock, you have trans issues.

Correct you are. Took the trans apart. The belt was worn out and the rollers had flat spots. Picked up a new 1/2" belt, made new rollers from oilite bronze, and just for the heck of it took about .040" off the inside half of the front pulley. Not sure how long the home made rollers will last but they are working fine for now. Now it goes just over 40kph but the engine speed is down to just over 6000 rpm. Now that the rpm is down it's back to looking for more hp. Another option would be lighter rollers to let the engine speed run up higher.

keithw

[Kenny_McCormic]

A spree has no rollers. Front pulley is solid aluminum on a spree engine.

[monkeywrench]

keep the spree for stock then by a 94 to 2001 elite and mod the * out of it should find good elite for 200 or less if it doesnt run then through after markets all over it and bam you got a kick * scoo ter