Have any of you experienced a severe intermitant breakdown and sputtering when jumping on the throttle hard. This occured last season occassionaly and again this past weekend. Ran an 800 Rev recently and litterally left him in the dust first run, next run the Yami brakes down like the dickens. We take a moderate run and not jump on the throttle and BANGO it's gone and runs strong again. 95% of the time the sled just pulls really hard. Changed plugs 3 weeks ago. Any input would be appreciated.
