It's not GY6...can you help? Yamaha Razz Riva By FACE PLANT FOR LIFE (Read 6,946 times)

[JR]

Apr 19, 2014 9:39:22 GMT -6 90gtvert said:

Howdy fellas. JR asked me to pop in if I had any ideas.

It could just be flooded? Have you tried holding the throttle wide open while you crank it over? If a 2T gets flooded sometimes the fuel will puddle in the crankcase. In that case you can remove all fuel supply and the plug will still come out wet when you turn the engine over. Either have to dump it out or siphon it out. Can't rely on it evaporating if there's much in there.

I really don't have experience with the Razz, but 71psi sounds too low to ever be a healthy runner. 6.3:1 could be a corrected compression ratio, not the compression ratio most of us think of. 71psi may be the correct spec, but I find it somewhat hard to believe that a chain drive scoot with 71psi compression test reading will ever run very well.

I would definitely check the reeds. Easy check is holding them up to light and seeing if any shines through. You may be able to get away with flipping the reed petals over. Maybe not, but it's worth a try for a quick fix. I've had engines running poorly and backfire and blow the reeds apart.

If the float level is set too high it could flood, but fuel will often overflow from the carb.

If you take the exhaust off and look up into the port with a light you may be able to get a look at the rings. They sometimes get stuck from buildup on 2Ts.

You can have a spark, but a weak spark may not ignite the mixture... especially if the mixture is not ideal to begin with.

Since it happened after cleaning the carburetor, never hurts to scrutinize your work there.

Thanks Brent! Guys when it comes to the 2t Brent knows the tricks and how to's, I myself just learned about the over flooding in the crankcase, a new one on me.

JR

[FACE PLANT FOR LIFE]

Hey guys...



Thank you
It was the reed valves...they were in backward!!!

[JR]

Good job!

JR

[Bashan]

Hi Brent, great advice and nice to have you post on the site....very nice. I've sent folks over to your site.....to sell you AM Way! Did you buy anything? Har har!......Why not? ...just three more detergents and I own a Pacific island! At least that's what they tell me. Great to have you on board, it's nice to bury the hatchet, in JR's Scro....hi Jack! No...just talking to Brent! Huh? Your scro? I dunno? Hey, that rhymed! I didn't mean anything by it!! Brent, help me out buddy! Let's run to Chinese Scooter Reference! NOW! Rich

[Alleyoop]

FANTASTIC!! Reed valve backwards WOW!! well it was an easy fix and it sounds really good to.
Ride Safe
Alleyoop

[Bashan]

Alley? Were you trying to divert attention from your crazy friend? Won't work bud....won't work.

[tvnacman]

Thats a nice ending !!!!!!!!!!

if you put the 70cc BBK on it you will leave your dad behind on his 150cc 4t for like the first two blocks .


John

[jvino]

Yeah your friends scooter might be toast it might need rebuilt 4000 miles seams like a lot of miles to me.

[jvino]

Oh the reeds are back ward I wonder why it ran before? So do you got the scooter running now?

[FACE PLANT FOR LIFE]

Apparently it didn't run before WE took the carb off. He tried to take it apart and clean it himself but he didn't know you weren't supposed to take the intake manifold and reeds off. So he ended up accidentally putting the reeds in backwards, and just assumed that cleaning the carb is what did it. He brought it to us and we cleaned the carb without knowing what he did, and he never told us. But all it took was the flipping over the reeds and now it runs great!

[Deleted]

Apr 20, 2014 10:16:51 GMT -6 jvino said:

Yeah your friends scooter might be toast it might need rebuilt 4000 miles seams like a lot of miles to me.

my razz has over 7000mi and will carry me up a hill at 25-30mph. amazing little machines.

[tvnacman]

So do you guys own this scooter or just helped out a friend ?


John

[FACE PLANT FOR LIFE]

We just helped a friend. We had a 3-person riding thing going on last summer before it broke. So we wanted to get it back up and running so we could all ride together. Since we got it running last night, we all went out riding today. I should get the action cam video that my brother took of us all riding and post it here.

[Alleyoop]

How are you feeling after going down? Still sore I bet
Alleyoop

[FACE PLANT FOR LIFE]

Little bit. It only hurts if I bend it now but I can walk on it without pain for the most part.