My Suzuki atv is very hard to start. I have to put a little gas in the plug hole to get it started. Once it starts it runs really good till it gets hot. Once its hot the idle starts to go higher and higher till it gets too high to shift it into gear. I did adjust the valves but it was doing this before the valve adjustment. I think I may have adjusted the intake valves a little too tight causing it to still be hard to start. But why does the idle go up and up once it gets hot? Yes, I did check the boots for air leaks and there are none.
You could try using petrol rather than gas to start it.
Also run it off petrol rather than gas.
SOURCE: 88 samuri ,engines idles faster when headlights come on
It is suppose to do that. When there is a power drain on the electrical system the "idle up" vacuum switch kicks on to up the idle speed to spin the alternator faster.
SOURCE: 97 nissan pathfiner 3.3l idles too high
It has been my experience that this problem is usually caused by a dirty or bad Idle Air Control Valve (IACV). I would try removing the IACV and cleaning it thoroughly, as well as the air passages in the intake manifold.
You can check the valve itself. Check the resistance between the two terminals with an ohmmeter. The resistance should be approximately 10 ohms at 77°F. Also make sure the plunger moves in and out without sticking or binding and the spring is not broken.
OK now the bad news, the (IACV) is at the back of the engine and up against the fire wall. Lots of bad words will be used to replacing this and i think the dealer charges $550.00 in labour alone.
You can try running Sea Foam through the manifold, just follow the instructions and there will be lots of smoke, Do a search on You Tube for Sea Foam. You can try blasting it with throttle body cleaner though a vacuum tube and down the throttle body, may have to use three cans, just follow the instruction again.
Good luck and keep me posted.
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