trouble getting over 27 mph. help please

[iceman77]

I'll check the compression and filter this evening. i think i read somewhere that it should be around 120. is this correct?
thanks for the help

[swimmingfree]

on your pipe i Google earth your town you live in a small town so this shood not be a big deal .. build a fire have some fun around it and at the end of the night .. throw it in it and let it roast on the coles of the fire till you get up .. pull it out of the coles and cool by it self (not put water in it to cool it down ) blow it out with a air hose and it will way a fue powns less paint with headder paint or hi temp paint .. and when you have the pipe off look in the ex port to see if it has a lot of carbon in it if so get ride of it ....
the mod you did you shood be doing about 35 at less now..
and do a compression test ..
swimmingfree
ps
the pipe is new to you but its still old and how knows how minny miles its got on it
what coler is the plug?????????????????????????

[Wheelman-111]

Greetings:

OCD Wheelman re-reading:

The Pipe is a month old with 30 miles on it and has been "drilled out", but is the neck of the header pipe still throttled by that flow-limiting "P"-model washer? It surprises me nobody thunk of that before. No degree of Roller Round-liness will help your speed if your exhaust is breathing through that straw...

[iceman77]

Greetings:

OCD Wheelman re-reading:

The Pipe is a month old with 30 miles on it and has been "drilled out", but is the neck of the header pipe still throttled by that flow-limiting "P"-model washer? It surprises me nobody thunk of that before. No degree of Roller Round-liness will help your speed if your exhaust is breathing through that straw...

I drilled the pipe out after i got the parts bike. but i'm not sure what you mean by "P" washer.

[iceman77]

i drove it this morning and i got up to 28mph on a down hill and the bike acted like it was cutting off untill i let off of the throttle, then it was fine. any input on this?

[Wheelman-111]

Greetings:

Quoth The Ice Man:

the bike acted like it was cutting off untill i let off of the throttle

Sounds like Lean behavior. Check to see if'n it's sucking air somewhere or go bigger on the Main.

The "P" washer refers to the restriction built into the exhausts of some Moped-Legal models like the (?)SA50P. I'm not sure which models had this "feature" but check the header section of the exhaust. It should be open to the full diameter of the headpipe. If there's a washer-type affair welded in there, the exhaust flow rate is limited by the size of its hole. Grind it out until flush.

[iceman77]

The "P" washer refers to the restriction built into the exhausts of some Moped-Legal models like the (?)SA50P. I'm not sure which models had this "feature" but check the header section of the exhaust. It should be open to the full diameter of the headpipe. If there's a washer-type affair welded in there, the exhaust flow rate is limited by the size of its hole. Grind it out until flush.

not the crush was correct?

[Wheelman-111]

Greetings:

Word economy good.
No good if question crazy sounds.
If mean crush washER, that Gasket. See headpipe
that size all way. Look washER block inside header. Take out.

[iceman77]

Greetings:

Word economy good.
No good if question crazy sounds.
If mean crush washER, that Gasket. See headpipe
that size all way. Look washER block inside header. Take out.

sorry. i ment crush washer.
i have no idea what you just told me in this post.

[swimmingfree]

some times when you start a new post all you do is make thing f up ..you need to show the photo of the expipe befor and after you open it up .. think that what Wheelman-111 looking for .. he dont no your post called looking for gears if you wood of stay on it that info wood be there for him ..its the same bike and your still looking for more speed so why staret a new post??? so stay on the post about 27 mpr and show the expipe before and after you open it up..
swimmingfree

[Wheelman-111]

Greetings:

Sorry Dawg, just giving you some jazz.

If your compression is good, your pipe or the air filter or an air leak is your issuem

Make sure the header has no obstruction and replace the filter element if in doubt.

[iceman77]

compression was 109. i cleaned the filter again, it seems good. i'm going to drive it to work this morning and see how it does. i'll check the exhaust pipe this evening.

[Bear45-70]

109 is low even for a stock 500 cc motor.

[iceman77]

so when i drove it this morning and this evening i could only do about 1/4 throttle, anything more than that and it acted like it was going to cut off. could bad reeds be the issue?

[Wheelman-111]

Greetings:

Reed-related misbehavior is usually hard-to-start and poor low-end. Could be reeds, but seems unlikely and a real PITA to disassemble and gaskets, et. al.

Check for vacuum leak with an unlit propane torch. As the scooter idles, fumigate the gap between carb and manifold. Lift the carb up&down manually and listen for ANY change in idle speed as the flammables augment the mixture.

I agree with The Bear that 109 is lackluster at best. Is the air filter "Springy"?