'05 Zuma no power

[ibenhad]

Long story short the belt went on my Zuma. Sat for 2 years. I did add stabil but I don't think it helped. The thing starts and runs great but has no power. I have blown compressed air through the exhaust no blockage, drained the tank (as low as I could) and added fresh gas, replaced the sparkplug , removed float bowel and cleaned (wasn't dirty or varnished over) did not spray cleaner into jets and cleaned the air filter. Still no power. Yes I did replace the belt with a stock unit from here (not the kevlar one). Any help would be appreciated. Ugh it's getting warmer and gas prices are rising....

[StepVino]

You did *not* clean the jets? You should do that, and also all the
small passages in the carb. Disassemble it completely, and spray
carb cleaner through the front air passages, and through the jet
fitting holes. Make sure you don't get carb cleaner on any of the
rubber seals, they expand then won't fit right.

[burnt_toast]

"did not spray cleaner into jets"

Is that correct? Thats the most important part of a carb clean.. lol Take it apart again and thouroughly clean the jets, most likely your pilot is clogged I'd bet 95%, also make sure no air leaks and lines are connected properly

[sanglant]

Long story short the belt went on my Zuma. Sat for 2 years. I did add stabil but I don't think it helped. The thing starts and runs great but has no power. I have blown compressed air through the exhaust no blockage, drained the tank (as low as I could) and added fresh gas, replaced the sparkplug , removed float bowel and cleaned (wasn't dirty or varnished over) did not spray cleaner into jets and cleaned the air filter. Still no power. Yes I did replace the belt with a stock unit from here (not the kevlar one). Any help would be appreciated. Ugh it's getting warmer and gas prices are rising....


The jets are the first thing to repair/clean. It doesn't seem like you're comfortable taking the carb apart, so here's an alternative. Take the bowl back off and spray everything you can. Put the bowl aback on and run a bit of Techron cleaner, not just the gas, but the concentrate they sell, into the carb. Pull the plug, leave it out, and crank the engine a few times to pull the cleaner into the carb. Leave it for half an hour or so. DRAIN the bowl, don't just crank it dry. Run fresh gas back to the carb, and crank the engine, still with the plug out. Once you're happy that gas is back in the carb and not just Techron, leave the plug out and walk away from the bike for a bit to let the gas in the cylinder evaporate. Put the plug back in and ride.

This is not a substitute for cleaning the carb and jets correctly, but it may work.

[ibenhad]

Thanks guys. I pulled the carb completely apart and cleaned it. There really was no gum or any kind of muck. The scoot still has no power. I also removed the gas tank completely and cleaned that and the petcock/filter. They also showed no signs of clogs or debris. Gas flows from the tank to the carb as thats how I drained the tank. Really have no idea (obviously) what to look at next. This really sucks as the scoot has low miles and ran great before the belt broke and I parked it. Could the dead battery be causing any issue. I had a motorcycle once that wouldn't get enough spark and bog out if the battery was dead???? Any other ideas??? HELP I wanna ride.

Funny thing here, I have a Harley a Ducati and a Chopper and the Scoot is more fun..... LOL Guess I like the looks from the people who think Im a circus clown. Well guess who will be laughing when gas hits 4-5$ a gallon....

[Squid121]

The Zuma is stock, right? Are you putting the air filter back on to do your test rides after the cleaning? With the filter not on at all or not on properly, the scoot will start and run but have no power as you describe.

[rmehuron]

Did you replace the belt with an OEM yamaha, or an aftermarket? Some of the aftermarkets are slightly different from stock specs and as a result, will lead to acceleration issues without tuning the rollers. You may need to go with some lighter rollers if this is the case to compensate. Otherwise, get a genuine belt.

[ibenhad]

I did replace the belt with an aftermarket from this site. The 35$ non kevlar one. Could that make that much of a difference? I'm off to take it apart yet again and remove the variator and the rollers/bushings and clean that whole area out. Maybe there is some old belt shavings in there.

[rmehuron]

Yes, I different belt can certainly cause these issues. What happens is....the new belt may have a different width or angle, as a result the way it rides up the variator has changed. You can compensate this by trying some lighter rollers or by getting a yamaha OEM belt. FYI, I just ordered an OEM belt and it came in today. I compared it to my athena aftermarket and it is almost .50mm smaller in width.