Search found 99 matches

by mikehailwood
Wed Dec 06, 2017 6:56 am
Forum: Technical Help
Topic: Reed valve petals not closed...concerned?
Replies: 14
Views: 8047

Re: Reed valve petals not closed...concerned?

I have a low compression (30lbs) scoot. This condition is not reed related....period Good to know. As I mentioned in my first post, cylinder, piston and rings all look and measure good. Pressurinzing the crankcase, the first and most obvious leak was the reeds. So I thought I'd address that as long...
by mikehailwood
Wed Dec 06, 2017 6:49 am
Forum: Technical Help
Topic: Reed valve petals not closed...concerned?
Replies: 14
Views: 8047

Re: Reed valve petals not closed...concerned?

Even though they're open at rest, should these things not close with crankcase test pressure? This is my first time looking at and trying to understand reeds. Open at rest? They should be closed at rest and only open during the piston's down stroke when vacuum is created. When you pressurize the en...
by mikehailwood
Tue Dec 05, 2017 10:03 pm
Forum: Technical Help
Topic: Reed valve petals not closed...concerned?
Replies: 14
Views: 8047

Re: Reed valve petals not closed...concerned?

Even though they're open at rest, should these things not close with crankcase test pressure? This is my first time looking at and trying to understand reeds.
by mikehailwood
Tue Dec 05, 2017 10:01 pm
Forum: Technical Help
Topic: Reed valve petals not closed...concerned?
Replies: 14
Views: 8047

Re: Reed valve petals not closed...concerned?

jakubman1 wrote:i got some
New? Size?
by mikehailwood
Tue Dec 05, 2017 10:00 pm
Forum: Technical Help
Topic: Reed valve petals not closed...concerned?
Replies: 14
Views: 8047

Re: Reed valve petals not closed...concerned?

eclark5483 wrote:Flip them around, or find replacements.
I flipped one side. Still not sealed.
by mikehailwood
Tue Dec 05, 2017 5:49 pm
Forum: Technical Help
Topic: Reed valve petals not closed...concerned?
Replies: 14
Views: 8047

Reed valve petals not closed...concerned?

I have a low compression (30lbs) scoot. Piston, rings and cylinder all look good so I moved on. I sealed the exhaust, the intake manifold and delivered air through the spark plug hole. The only leak I found so far is from the reed valve assembly. 5-7 lbs. of air into the crankcase and air flows cons...
by mikehailwood
Mon Nov 20, 2017 8:30 am
Forum: Technical Help
Topic: another bystarter question
Replies: 4
Views: 3328

another bystarter question

Even though my bench test of the bystarter showed the barrel/needle moving about 1/8" when 12v was applied (indicating a properly functioning bystarter), I tested the bystarter air circuit with the syringe. When the bystarter is cold, air will flow through the circuit when air is squirted in. W...
by mikehailwood
Sat Nov 18, 2017 4:14 pm
Forum: Technical Help
Topic: orifice of bystarter bowl clogged
Replies: 6
Views: 4377

Re: orifice of bystarter bowl clogged

I like to soak with carb cleaner 24 hours, then poke the hole. In this case you could just put some carb cleaner in the bowl in both the main bowl reservoir and the bystarter reservoir.
by mikehailwood
Sat Nov 18, 2017 3:12 pm
Forum: Technical Help
Topic: bystarter question
Replies: 4
Views: 3183

Re: bystarter question

I believe you can test it by removing it and giving it power. It has a little needle that should move after about a minute or two. Yes it can. I bench tested it with a 12v battery when I last cleaned the carb. The bystarter heated up as it was supposed to and the needle/barrel moved about 1/8"...
by mikehailwood
Sat Nov 18, 2017 11:08 am
Forum: Technical Help
Topic: bystarter question
Replies: 4
Views: 3183

bystarter question

Most comments regarding a malfunctioning bystarter indicate that the barrel/needle can be stuck in the open position, allowing excess fuel to enter the motor even after warm-up. Is it possible for the barrel/needle to stick in the closed position, not allowing enriching to take place during cold sta...
by mikehailwood
Wed Apr 15, 2009 10:35 pm
Forum: Technical Help
Topic: compression before vs. after exhaust cleaning?
Replies: 10
Views: 4231

compression

I installed a new OEM filter element today. This made a huge improvement. I have discovered that this scooter is supposed to have (but does not currently have) and exhaust pipe gasket (header to head). I have purchased one but have not yet installed it. What effect does the lack of a pipe gasket hav...
by mikehailwood
Tue Apr 14, 2009 8:55 pm
Forum: Technical Help
Topic: compression before vs. after exhaust cleaning?
Replies: 10
Views: 4231

compression

Okay. Back up. First, this is a 1983 Express. Not as much help out there for Expresses as can be found here for the Spree. Similar powerplant - 49cc 2 stroke of same brand and similar model year as Sprees. In fact, uses the same head gasket and the carb is suprisingly similar. Scooter came w/o an ai...
by mikehailwood
Mon Apr 13, 2009 3:29 pm
Forum: Technical Help
Topic: compression before vs. after exhaust cleaning?
Replies: 10
Views: 4231

compression

Wait a minute. I have had compression readings in excess of 165 lbs and I understand that 114-120 is acceptable. Likely cause of my higher compression (and accompanying poor performance) is said to be carbon accumulation on the piston (mine is clean), inside of head (mine is clean), clogged exhaust ...
by mikehailwood
Mon Apr 13, 2009 11:40 am
Forum: Technical Help
Topic: compression before vs. after exhaust cleaning?
Replies: 10
Views: 4231

compression before vs. after exhaust cleaning?

Has anyone recorded engine compression readings both before and after cleaning their exhaust system? If so, what were those readings?
by mikehailwood
Thu Mar 26, 2009 10:33 am
Forum: Technical Help
Topic: bystarter help
Replies: 4
Views: 2558

bystarter

tony, It sounds like your bystarter works like that on the late model Honda Express. For an explanation of how it works, go to the Honda Service Manuals on this site. Click on the link to mopedriders.org. Click on Honda Express Manuals.., select Honda NC50 NA50 Express Manual 1977-1981, at the next ...