Just bought my son a used viper 90. it is stock. curious if I should upgrade anything.

 

Please try this site www.malossi.com
For your atv they have reed valve(carbon) in Croatia price is 33,00$
carburettor kit 021
multivar
kevlar belt
rollers
adjuster spring
torque driver
fly clutch
delta clutch
racing spring sets
If you want something send me prices in US and I will send prices in Croatia Europe

 

Hey guys. Welcome to the forums.

 

What year is the Viper?They are generally great little bikes in stock form but the 05s had a bit of trouble with the spark arrestor plugging up.You might want to keep an eye on it or get rid of it altogether..The bike will lose power big time when it plugs up...Aftermarket shocks are a great upgrade for any mini.

 

Similar problem maybe???

My son's Eton Viper 90 is giving us problems. We were riding around in the rain and mud (not deep) earlier this week and everything was great for about an hour. It then started boggong down to where is would not move under throttle. With the chock on it runs fine, which I imagine it shouldn't when it is warm. We gave it a good cleaning and changed the air filter but it has not solved the issue.

Could this be the spark arrestor, or is it more likely to be the carb or electricals?

Any help would be appreciated. I have a copy of the service manual in pdf I can e-mail someone if interested.

Thanks,

Tony

 

I'd say to clean the carb real good and put a new plug in. Ours use to do the same thing when it was stock.

 

I'd agree with Newnick, Check plug first , aircleaner, sparkplug boot for water, etc.