Thanks to a tip, found a good bolt-up mod for the Spree.
Turns out the SB50 intake and reed valves are MUCH larger flow than the NQ50 (Spree) stock parts. The SB50 intake has a better transition at the carb end, and a larger opening at the reeds. The SB50 reeds are also larger cross-section. Best thing is that that part will bolt up to a stock Spree, and have been reported to help top end. The SB50 intake is painted red in the following pictures.
Note the larger transition at the carb. If anyone was wondering how the intake mod should look, this is it.
Here's the Spree for reference. You can see the choke point here. Note that the Spree intake interface is 17mm diam, whereas the SB50's is 18-19mm (oval shaped). The Spree decoupler will work in this arrangement, a new SB50 decoupler is only $4 from Honda, and shows available:
Here's a top view of the reeds. Note that the insert to case is identical:
Only problem I see is that there's no oil port for the Spree's oiler system. Here are your options:
- You could oil through the vaccum port, and convert the petcock to always flowing. Many have done accidentally by breaking the diaphram with compressed air; this requires you to cap off the lower vacuum connection on the petcock.
- You could also run pre-mix, removing the teeth from the oil pump.
- You can run down a SB50 carb; having looked at these they don't appear to be any different from the Spree, except for the oil injection tube at the manifold.
- You could add an oil injection port to the manifold and press it in ala the Spree manifold.
This is the repository for hop-ups and mods for Elite and Spree. Look here for information on exhausts, porting, cylinders, intakes, and suspension mods.
Moderator: FAQ Moderator
1 post • Page 1 of 1