Search found 11 matches

by kwazydave
Wed Sep 09, 2015 10:40 pm
Forum: Performance Technical
Topic: Questions about 87 nq50 mods.
Replies: 20
Views: 8740

Re: Questions about 87 nq50 mods.

I used a yamaha zuma as a test mule with my latest mod. Before I ported the intake and made the carbon reeds I compared acceleration. I am quite sure it is variable drive and from a standing start the zuma would pull me by at least 4 scooter lengths, but then the spree would make that up plus 4 leng...
by kwazydave
Tue Sep 08, 2015 10:13 am
Forum: Performance Technical
Topic: Questions about 87 nq50 mods.
Replies: 20
Views: 8740

Re: Questions about 87 nq50 mods.

I used carbon fiber reed paper. I used a small cut off disc in a dremel type tool to carve them out. When I was done I sanded the edges with 600 paper to make sure there were no sharp edges.
by kwazydave
Mon Sep 07, 2015 8:34 pm
Forum: Performance Technical
Topic: Questions about 87 nq50 mods.
Replies: 20
Views: 8740

Re: Questions about 87 nq50 mods.

I wound up ordering .3mm reed paper when i ordered the pipe. It has a little curl to it that worried me a little. I dont know if that is typical for the thin sheet to be curled or if it is a defect. I ported the intake elbow and made the reeds today. The reeds dont sit exactly flat but very close. I...
by kwazydave
Tue Sep 01, 2015 10:13 am
Forum: Performance Technical
Topic: Questions about 87 nq50 mods.
Replies: 20
Views: 8740

Re: Questions about 87 nq50 mods.

as an update to this, I purchased a mlm pipe for the scoot. I took it out for a dig. I didn't wring it out but it definitely revs out better. I didn't really feel a kick when it came on the pipe like I hoped, but it needs tuning for sure. It seems plenty rich at this point. Does anybody know what rp...
by kwazydave
Wed Aug 19, 2015 11:15 pm
Forum: Performance Technical
Topic: Head Thoughts
Replies: 0
Views: 2610

Head Thoughts

THE stock head on a 87 nq50 has areas that are quite thick, actually almost 7/8 inch. I wonder why this is. It would seem to me that it would slow down the cooling. I was thinking of machining some of the thick areas down but leaving standing ribs where I can. I know there are a lot of different an...
by kwazydave
Tue Aug 18, 2015 9:59 pm
Forum: Performance Technical
Topic: Port timing vs compression?
Replies: 1
Views: 1701

Port timing vs compression?

With the spree 48mm big bore kit they send two base gaskets to prevent piston to head contact, I assume. With this second gasket there would be a slight loss of compression, however there would be a gain in port timing. So, my question is, if the head was machined just enough to clear the piston, pl...
by kwazydave
Mon Aug 17, 2015 8:33 pm
Forum: Performance Technical
Topic: Questions about 87 nq50 mods.
Replies: 20
Views: 8740

Re: Questions about 87 nq50 mods.

Take off with the stock gearing was very close and with the latest version should be pretty much the same as stock if not a little better. When you get on the pipe its like a swift kick in the behind ;-) you'll be holding on tigher from 10-15 MPH to when the revs top out. Thank you for all the info...
by kwazydave
Sun Aug 16, 2015 11:08 pm
Forum: Performance Technical
Topic: Questions about 87 nq50 mods.
Replies: 20
Views: 8740

Re: Questions about 87 nq50 mods.

with that pipe would take off with stock gearing be close to what the take off was when it was stock?
by kwazydave
Sun Aug 16, 2015 7:08 pm
Forum: Performance Technical
Topic: Questions about 87 nq50 mods.
Replies: 20
Views: 8740

Re: Questions about 87 nq50 mods.

the big bore cylinder has the exhaust port about 2mm higher than the stock one so I am thinking I might leave that alone. I know a variator drive would be ideal but with my limited knowledge of these things it would seem that I would almost need a doner bike to swap out the crank and crankcase and v...
by kwazydave
Sun Aug 16, 2015 3:14 pm
Forum: Performance Technical
Topic: Questions about 87 nq50 mods.
Replies: 20
Views: 8740

Re: Questions about 87 nq50 mods.

I ve seen adds for new, stock appearing, exhaust and was wondering if they flow any better than a stock pipe. It is pretty much a challenge to see what it will do. The reason I asked in the first post about rpms is so that I have an idea of how much i need to gear it up. If I can rev it and it will ...
by kwazydave
Sat Aug 15, 2015 11:11 pm
Forum: Performance Technical
Topic: Questions about 87 nq50 mods.
Replies: 20
Views: 8740

Questions about 87 nq50 mods.

Hi all, I am new to this site and to scooters. However I am not new to modifying things. I am working on a 87 spree nq50 in the hopes of increasing the top speed. Target speed is 45mph. I have purchased a 48mm kit and intend to modify the air box and jetting accordingly. I am thinking about milling ...