Not a moped, but - Yamaha U5 - Newport

Brent Bublitz /
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So I just came across a Yamaha U5 Newport in pretty decent shape aside from a massive spray bomb job. I know it is pedal deficient, but it is a solid 2 stroke oil injected three speed setup. I'm willing to take some shit about it being a scooter/motorcycle if I can get some answers from the generous hive mind.

I have been searching for a while and I really, really can't find any solid information on these. I'm hoping the big brains here have some kind of experience.

It starts (both kick start and electric) and runs well, no issues at all so far. It gets up to 40 on the flat if there is no wind. The oil injection setup seems to be working and really looks like it's in great shape, so I'm sticking with it for now.

What I'm really wondering is if the top end is compatible with the QT50 or other Yamaha kits, or if someone has an idea what I can do for a little more performance. Carb/pipe are an obvious choice, but the cylinder has a weird threaded connection, not a bolt on like the QT. I would like to avoid hacking the header unless there is no good option otherwise. For a chamber, I would want something with massive bottom end as this motor is never going to wind out.

The carb is under a side cover and I think it's case inducted. I have not really pulled it apart to check yet.

Any one mess with one of these and have some tips? Anyone have a link to a shop manual that is not a shitty $15 xerox from Ebay?

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  Not a moped, but - Yamaha U5 - NewportTopic by: Brent Bublitz Brent Bublitz 08/16/15 12:18AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Bob Selby Bob Selby 08/16/15 08:41AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Ben Whittle Ben Whittle 08/16/15 11:40AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: kevin Smellaflange kevin Smellaflange 04/30/19 03:57PM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Eero W Eero W 08/16/15 12:04PM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Rodger Will Rodger Will 08/19/15 11:55AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Deadped Ryan Deadped Ryan 08/24/15 08:36AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Charles Cole (OFMC) Charles Cole (OFMC) 08/25/15 09:57PM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Stan Henderson Stan Henderson 01/16/18 02:17PM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Born to be WillD Born to be WillD 01/17/18 05:01PM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Brian Adams Brian Adams 10/28/19 10:59PM
  Re: Not a moped, but - Yamaha U5 - NewportRe: P8R . P8R . 01/16/18 04:03PM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Chris Szuba Chris Szuba 04/26/19 06:31AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Chris Szuba Chris Szuba 04/27/19 08:12AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: P D P D 04/27/19 10:37AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Chris Szuba Chris Szuba 04/29/19 10:33AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Born to be WillD Born to be WillD 04/29/19 01:36PM
  Re: Not a moped, but - Yamaha U5 - NewportRe: kevin Smellaflange kevin Smellaflange 04/27/19 05:54PM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Chris Szuba Chris Szuba 05/02/19 10:36AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Chris Szuba Chris Szuba 07/18/19 08:20AM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Michael Smith Michael Smith 11/01/19 08:49PM
  Re: Not a moped, but - Yamaha U5 - NewportRe: Bob Selby Bob Selby 11/03/19 09:47AM

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