Also keep fire extinguisher nearby) • Propane (take the tip off and attach a long rubber hose) • WD-40. • Water. To find your vaccum leak, choose one of the above and spray or point in the suspect areas while engine is idling. Any change in idle RPM, whether up or down indicates a vacuum leak.
2. Posted: Jun 2, 2020. Options. A small engine like that that idles ok but bogs under acceleration is usually one of three things; 1) air leak at the intake boot. A squirt of starter fluid at the boot while running will tell you. If it revs you have a vacuum leak. SemiFast. You shouldn't have to screw with the idle screw, * cold engine or hot engine. Normally the engine needs choke to start when cold then can be 'feathered off' as the engine warms. 1) Sometimes a slight oil control problem will sort of compensate for the extra fuel a cold engine needs and start without choking. Hey guys!! I worked on my 2007 250 with 14k miles. I GOT IT STARTED!! Adjusted the valves, fixed carbs, cleaned chain tensioner, and put a different battery 5288 posts · Joined 2009. #8 · Jan 19, 2010. I had a Honda CJ250 once with split diaphragms. Because they're expensive I wanted to make sure that the bike was otherwise ok. My solution - as a test - was to punch the slide through a sheet of clingfilm then put the lid back on the carbs so that the clingfilm was trapped under the diaphragms