Search found 99 matches
- Wed Dec 06, 2017 6:56 am
- Forum: Technical Help
- Topic: Reed valve petals not closed...concerned?
- Replies: 14
- Views: 8489
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...
- Wed Dec 06, 2017 6:49 am
- Forum: Technical Help
- Topic: Reed valve petals not closed...concerned?
- Replies: 14
- Views: 8489
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...
- Tue Dec 05, 2017 10:03 pm
- Forum: Technical Help
- Topic: Reed valve petals not closed...concerned?
- Replies: 14
- Views: 8489
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.
- Tue Dec 05, 2017 10:01 pm
- Forum: Technical Help
- Topic: Reed valve petals not closed...concerned?
- Replies: 14
- Views: 8489
Re: Reed valve petals not closed...concerned?
New? Size?jakubman1 wrote:i got some
- Tue Dec 05, 2017 10:00 pm
- Forum: Technical Help
- Topic: Reed valve petals not closed...concerned?
- Replies: 14
- Views: 8489
Re: Reed valve petals not closed...concerned?
I flipped one side. Still not sealed.eclark5483 wrote:Flip them around, or find replacements.
- Tue Dec 05, 2017 5:49 pm
- Forum: Technical Help
- Topic: Reed valve petals not closed...concerned?
- Replies: 14
- Views: 8489
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...
- Mon Nov 20, 2017 8:30 am
- Forum: Technical Help
- Topic: another bystarter question
- Replies: 4
- Views: 3464
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...
- Sat Nov 18, 2017 4:14 pm
- Forum: Technical Help
- Topic: orifice of bystarter bowl clogged
- Replies: 6
- Views: 4534
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.
- Sat Nov 18, 2017 3:12 pm
- Forum: Technical Help
- Topic: bystarter question
- Replies: 4
- Views: 3312
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"...
- Sat Nov 18, 2017 11:08 am
- Forum: Technical Help
- Topic: bystarter question
- Replies: 4
- Views: 3312
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...
- Wed Apr 15, 2009 10:35 pm
- Forum: Technical Help
- Topic: compression before vs. after exhaust cleaning?
- Replies: 10
- Views: 4354
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...
- Tue Apr 14, 2009 8:55 pm
- Forum: Technical Help
- Topic: compression before vs. after exhaust cleaning?
- Replies: 10
- Views: 4354
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...
- Mon Apr 13, 2009 3:29 pm
- Forum: Technical Help
- Topic: compression before vs. after exhaust cleaning?
- Replies: 10
- Views: 4354
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 ...
- Mon Apr 13, 2009 11:40 am
- Forum: Technical Help
- Topic: compression before vs. after exhaust cleaning?
- Replies: 10
- Views: 4354
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?
- Thu Mar 26, 2009 10:33 am
- Forum: Technical Help
- Topic: bystarter help
- Replies: 4
- Views: 2621
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 ...