My 2 stroke trials bike wont start. I thought id gone into reserve tank when the engine just died. Got heaps of compression still when i kick it over and it was running ok up until this point. Do you have any suggestions ?

How does the compression feel now that you have it cranking over again. Without the decompression lever pulled in it should be next to impossible to kick it over. also, is there any noise coming from the engine (knocking, etc.) when you got it to start again.

mostly in reserve the bike uses the last of the petrol that is available in the tank an that petrol contains a lot of unwanted particles that choke up the carburettor...i recommend you to clean your carburettor and it will help

So you've tested a spare spark plug sitting outside grounded to cylinder and you defintely have good spark?
If so....is it getting fuel? Is the enricher (choke) working?l

If the valves "rock" at TDC, the piston is at TDC EXHAUST, not TDC COMPRESSION. Chances are the engine is flooded. Install a fresh spark plug and go easy on twisting the throttle when starting the bike. Be sure the battery is in good condition. Push the kick lever to just past TDC compression then give a strong kick. Don't try to kick start with the piston going upward on the compression stroke. Be sure the air cleaner is not dirty and you have good gas. Please rate my answer. Thanks!

Ok, a two stroke engine basicly needs 3 things to run: fuel, compression and ignition.

First, check that the fuelline, fuelfilter, or fueltap is not blocked. If the fuelflow is alright, check that the compression is fine. try kicking the kickstarter a few time: the should be a certain resistance.If the compression is wrong try changing the headgasket. If it is alright, check the ignition. This is done by taking the sparkplug out at placing it on the frame, when you kick the kickstarter a spark should jump from the sparkplug to the frame.

But my guess would be that you have a partly blocked fuelsystem.

sounds like you may have over adjusted the decompressor, back it off to where it was, this would make it backfire.
To kick them, push the kickstart through its stroke until you get to feel the compression as it approaches the compression stroke, then use the decomp to kick it just past top dead, let the decomp go and then kick it, no throttle

Assuming the engine will turn over, the ratcheting assembly on the kick starter may be worn. Remove the kick start lever and then the side cover, (place a pan under the bike to catch any oil). The kick starter is basically just a gear and a spring; the gear will in some manner engage the flywheel, (sometimes indirectly). Make sure there is nothing obvious wrong such as broken teeth or debris lodged in the mechanism.

The other possibility if the engine does not move when rolled is the timing chain may have jumped teeth on the cam sprocket. To get to this remove the gas tank, remove all but the rear engine mounting bolts, remove the valve cover. To check remove the fly wheel cover set the piston to Top Dead center, (TDC) on the compression stroke and make sure the mark on the cam sprocket is at the top of the sprocket and not off set.

Good luck.

Several things can cause the problem. First, spring for a new spark plug. The stock plug is NGK CR8E. Now the plug is eliminated as a problem. Next, pull the slide out of the throat of the carb. Now remove the jet needle. Put the needle clip on the 4th notch, (this is the stock setting). Use only premium gas. Next, follow the starting instructions below.

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. 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. Release the de-compression lever and 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 a 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 and clean air filter will also aid in starting.

This will likely tame the beast for you. Please rate this answer. Thanks!

sounds like piston rings gone/con rod broken, 2/4 stroke? stupid question but did you check the spark plug/s? if missing/blown off will cause low compression,

Hi!
You obviously look after your machine and very sensible when laying up, however as you are probably aware 2 strokes rely heavily on compression, A. to produce excellent combustion and B. to draw fuel into the chamber. So when you try kick starting you can't get enough revolutions to draw the correct amount of fuel into the cylinder, where as you push start you constantly turn over the engine increasing compression slightly and bingo it fires.
Can you remember how when kick starting it before this problem the feel on resistance when kicking over? has it now become a lot easier? if so you possibly have worn or broken compression piston rings.
A compression test will reveal this, I hope this sorts your query?
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Paul 'W' U.K.