Drilled holes in my exhaust = +10MPH!!!!

[delorean696969]

Hi, new to this forum and recently acquired a free 1986 honda spree from a relative. After sitting for several years, I drained out the gas and put a can of STP gas treatment and full tank of gas and it fired right up!

It didn't have much power and struggled to reach 25mph. So I did some research on this forum, and ended up drilling four 1/4 holes in the rear of the muffler. The difference is night and day! I have more low end torque and now reaches 35mph without any issues.

Next will be removing the vairiator restricting plate from the transmission??? I searched for a DIY with photos, but couldn't find one. Can anyone post a link or DIY with photos?

Thanks again!

[Wheelman-111]

Greetings:

I hate to be the one to break the news to you. Sprees have no variator. You can install a 44mm bore kit that's appeared in the Forum and on eBay lately, but if you're hitting 35 already, you're ahead of average.

A larger rear tire will add groundspeed. It seems up to a 3.00 may fit. Or dude, swap in a Dio!

Nice score and good work getting it running.

[delorean696969]

Ah nice, thanks for the tips. What about the pulley mod, will that work on the 86 spree? I saw it in the technical docs section, but no pictures. (I like images)

[wikked_spree57]

Greetings:

I hate to be the one to break the news to you. Sprees have no variator. You can install a 44mm bore kit that's appeared in the Forum and on eBay lately, but if you're hitting 35 already, you're ahead of average.

A larger rear tire will add groundspeed. It seems up to a 3.00 may fit. Or dude, swap in a Dio!

Nice score and good work getting it running.

2.75 is pushing it. I had a SA front wheel on my Spree and the 3.00 tire rubbed on the fork tubes. It rubs on the fender a bit too.

2.75 tire for front, 3.00 on back. I managed to squash a 3.50 on my 85 a long time ago, but it just *barely rubbed the case and wore out the side wall, not good...

[toboggan]

Haha, well congrats on getting your scoot to go faster, could you post some pics of where exactly you drilled the holes? that'd be great!

~toboggan

[CHEVY-212010]

yeah pics, are they drilled around the original exhaust hole, and did you drill through the baffles?

[delorean696969]

Okay, here is a picture of the four holes I drilled in my spree. It's a lot louder though, I will mention that. I only drilled about 4" in (through the first baffle) and that just happens to be the perfect amount of back pressure.

[toboggan]

the image doesn't work

[GIJoeBob]

Rehosted -

[CHEVY-212010]

Thanks GIJoeBob!

[Conor]

will drilling these holes make any differance if you're driving a "iowa" honda spree?

[wikked_spree57]

Iowa Sprees have a washer welded inside the header tube where it connects to the cylinder. Remove the pipe and use a step drill to remove it. Should gain you at least 5MPh

[Conor]

i understand that but will it be effective to drill holes after you remove the washer?

[toboggan]

as long as the washer is removed, it should have the same effect as a non-restricted exhaust.

[elited]

congrats on the extra power, but doesn't drilling holes in the exhaust make the muffler louder?