2019 Genuine Roughhouse By jonwayne (Read 343 times)

[jonwayne]

Howdy all! I have a 2019 Genuine Roughhouse that I put a Malossi 72cc cast iron kit on with a Malossi 19mm DellOrto Carb 90 main jet 40 pilot jet. I also have a Malossi racing variator with 8g roller weights & a Delta clutch with white springs. The problem im having is after riding it for roughly 15 minutes it loses power & keeps losing power until it doesnt even want to move. Feels almost like something is slipping, the engine doesnt die but also doesnt rev up either when this happens. Funnily enough the problem disappears if I happen to run it without the CVT cover. Any help is much appreciated! Thank yall
Also i've run the BBK for over a year with no problems, then it started acting up and I ordered the parts for the transmission in the hope that was the issue.

[classacted]

I'm new to the forum, but I'm not new to repair.  my first 'go to' when that happens is loosen the exhaust nuts or bolts at the cylinder head and put a screwdriver between the exhaust and head to allow exhaust to escape just for diagnostic purposes.  if that doesn't help, take out the air filter and try it.  the spark plug could also be fouling or out of gap.  possibly even loose.  I've seen it before.

there are other things to try.  but try those first.

[jonwayne]

I'll give it a go this week, spark plug was recently replaced but I'll double check that as well. I planned on trying to upjet it this week to see if that helps it any. (I'm thinking its a heat issue) thank you!

[jonwayne]

Aug 12, 2022 13:57:53 GMT -6 classacted said:

I'm new to the forum, but I'm not new to repair.  my first 'go to' when that happens is loosen the exhaust nuts or bolts at the cylinder head and put a screwdriver between the exhaust and head to allow exhaust to escape just for diagnostic purposes.  if that doesn't help, take out the air filter and try it.  the spark plug could also be fouling or out of gap.  possibly even loose.  I've seen it before.

there are other things to try.  but try those first.

So loosened the exhaust and it runs awesome, figured its a sign to upgrade the exhaust to match the rest. Sure wish I would've thought to try that sooner! Thank you

[classacted]

it looks like your engine was unable to breathe.

that is normal for carbon to fill the exhaust.  being cheap, I would drill holes in the muffler then plug them with a screw one at a time and take the moped for a ride.  when I saw that the moped didn't have as much power I would remove only the last screw and call the repair complete.  a plugged exhaust can cause the moped to lose power or die completely on the road and NOT restart.  if this happened to me I would remove one of the screws.  there is a port from the cylinder to the muffler that needs to be kept clear too.

I would never buy a new muffler.  mopeds are supposed to be cheap.  I think using a car is cheaper than buying parts unnecessary.