Question about 2005 KTM 640 LC4 SM

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Very hard to kick start

Good engine , loads of compression,sometimes have to flick the decompressor to start off the button. very nasty to kick start,nearly guaranteed to kick back.
cheers. ****.

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  • tombones May 11, 2010

    Leave the throttle fully closed when kicking.

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I dont know what your timing is relevant to flicking the compression switch and kicking, but get the engine to the compression stroke and then as you go to kick it hard, flick the switch at that moment. timing is everything. i had an old yamaha tt 500 that kicked back so hard my foot slipped off the kick start and kick lever came up and took the skin off my shin.. it took quit a bit of time to get the timing but once i did, it was easy.. hope this helps.

Posted on May 21, 2009

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Posted on Jan 02, 2017

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1 Answer

Jonsered 2255 chainsaw, how to start it, just got this chainsaw and its got a pressure release on the thing, how does that work as to starting the chainsaw


Hi Kerry,
The decompressor valve is there to make starting easier. All you need to do is to push the button in before you try to start the saw. As soon as the engine fires, the button will pop out and the saw will then operate normally.
Just remember that if you pull the saw over and it kicks, but does not start, you'll probably need to push the decompressor in again.

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Runs but hard to start due to compression.


If it is an OHV engine it may just need a valve adjustment; although, decompressors do fail in these engines.

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Very can be if it is an OHV engine that either the valves are needing adjusting or the decompressor has failed.

Most 4 cycle small mower engines have decompressors to help with the starting, These are only active at start-up and does not effect normal engine compression when running.

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Briggs & Stratton 33M777/21HP


Check your valve adjustment first as these uses a decompressor that on the camshaft itself.

Now while checking the valve clearances as you go past TDC of the compression stroke there should a little bump on the intake valve when the decompressor is working. If this bump is not there and the valves are set correctly then the decompressor has failed and requires the cam to be replaced.

10 276781SingleCylinderOHV pdf

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Husqvarna YHT 2348,NEXT TO IMPOSSIBLE TO START THE BRIGGS STRATEN INGINE, VERY HARD TO TURNOVER, NEW BATTERY AND STARTER, IS THERE TWO KINDS OF STARTERS, PERHAPS A HEAVY DUTY ONE, EVEN HOOKES IT UP TO


Most likely the valves are needing adjusting. These engines have decompression release that reduces the initial compression to make starting easier then once the engine is running no longer effects the compression. Also a badly worn cam or failed decompressor can cause the same problem.

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Husqvarna 372xp won't start... Mysterious


I recently bought a brand new 372XP and spent the first day trying to start it as per the instruction manual with no success, never even fired once. Removed the plug to find plenty of fuel and that the plug has a good spark. Left it until the next day mainly to allow my arm to recover (& scour the internet for clues). I found a forum that said not to use the decompressor and sure enough without the use of the decompressor button it fired first go with the choke on then I reset the choke & it ran properly on the second pull. The decompressor button can be reset with fine nosed pliers or removal of the top cover by undoing three screws. Good luck it's a great saw once you know how to start it.

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1 Answer

Briggs 17hp intek overheadvalve on a john deere L100 has developed a hard start hard spin on compression stroke. new battery new starter


hi there

pauly46 here

if engine seems to labour when trying to start as if too much compression ?

try adjusting to in and ex valve clearance to 0.003" inlet and 0.005" ex

inlet valve is the bottom valve, and has a alloy push rod. ex valve is top valve and has steel push rod ( as viewed from the front of the machine with rocker cover off ) )

note rotate engine with plug out to tdc compression stroke , then rotate it down the bore on power stroke by 1/4 inch ( 6.35 mm ) this is the point for setting in / ex valve clearances

manual says 1/4 pst tdc on compression stroke - this eliminates decompressor lift from the setting


cheers hope it hepls

May 01, 2011 | Briggs & Stratton Garden

1 Answer

Honda 1132 one year old commercial use now has high high compression on startup making it v hard to pull. runs fine once started


Sounds to me like the decompressor is not working.You need to find out what this engine uses for a decompressor,whether it be a valve adjustment thing or a linkage thing,the dealership service manager should be able to give you some guidance.

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1 Answer

Bike is sometimes hard to start.When bike stalls and goes dead,it is hard to start again.This is a 2003 honda crf450.


There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Jun 28, 2009 | 2003 Honda CRF 450 R

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