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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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Old 7 Nov 2011
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1984 xt600 kicks back--HELP!!!

I bought an 84 xt 600 not running.
Cleaned out the carbs and installed new compression release cable.
Also the kick start stop was broken. replaced those and put and new gear on the start shaft. bushing was loose.

Now it starts.
But it kick back so badly it felt like it broke my ankle.

What did I do wrong?

Thank you very much in advance for any help.
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Old 7 Nov 2011
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Big secret to start xt


Do not use any throttle when starting, choke only, do not use throttle.

my method, apply choke, grab throttle , twist forward(NO throttle) grab front brake, KICK.

Cheers from Oz.
I'm not getting older; I'm just progressing through LIFE!! Harleys do not have a throttle- they have VOLUME control!!!
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Old 7 Nov 2011
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Originally Posted by Spyder1427 View Post

But it kick back so badly it felt like it broke my ankle.

What did I do wrong?
Nothing! It is all part of the character of a kicker

Mind you, it is probably worth checking the timing.

Also it is good character building stuff to own a bike with a kick start!!
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Old 8 Nov 2011
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There's a technique to kick starting big singles. First, as Chucky said, no throttle. Do the kicking bit with the throttle shut.

For the next bit I'm assuming you've got the timing right and that it's not stuck / defaulted to full advance. The timing for starting should be around 5-10 degrees BTDC. If it isn't, for whatever reason, it will kick back. It's unusual for modern(ish) Jap stuff to have a timing problem but for the sake of your leg it's worth checking.

Next you need to get the piston in the right place for starting - slowly push the kickstarter down until you can feel it come up on the compression stroke. Now pull in the compression release and ease the piston just past the top of its stroke (you can feel it move). Release everything, let the kickstart come back to the top and come down on it with your whole weight. You need to get the piston moving as quickly as you can - a wimpy kick won't work. Keep the throttle shut!

The idea behind getting the piston just past TDC before kicking is that it then has two complete revolutions to get some speed / momentum going before the firing stroke (and at the same time the kickstart reaches the bottom of its stroke and disengages from the engine, so saving your leg). Half strength kicking or starting with the piston in the wrong place are the main causes of kickback.

If it doesn't start within 2-3 kicks you've probably flooded it. Switch off ignition, switch off fuel and choke, open throttle fully with compression release pulled in and kick the engine over 3-4 times to remove excess fuel. Then switch everything back on and start again.
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Old 8 Nov 2011
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I have now been through pretty much the whole bike's electrical system.

we removed the stator and pickup coil. tested pickup coil with ohm meter and it was out of spec by 100 ohms. we froze it and heated it. now there it has an open loop in it.

I am trying to find a replacement now.

Could this be the reason it kicks back? Is it getting a signal to fire to early?

It is kicking back enough to throw a 250lb person over the bike.

thank you again for any input.
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Old 9 Nov 2011
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sounds familiar.

I had my 83 xt550 do the same thing to me that resulted in a fractured tib, turned out to be the pickup coil as you have already figured out. I found a replacement stator on ebay for around a 100 bucks but that was kind of lucky i think.

unfortunately the pickup is just part of the stator and you usually have to replace the whole thing. I looked into buying an aftermarket pickup coil and attempting to rewire and squeeze it in there but since nothing I could find looked remotely close to the right size i just opted for the ebay option.

or if you want to go new be prepared to shell out.
1984 XT600L Yamaha Motorcycle GENERATOR Diagram and Parts

potentially you could find someone in your area that does rewinds but also expensive and the pickup is quite 'packaged' making it more difficult.

maybe this one will do.http://www.ebay.com/itm/XT600-84-89-STATOR-COIL-MAGNETO-GENERATOR-ALTERNATOR-86-/130531711803?pt=Motorcycles_Parts_Accessories&vxp= mtr&hash=item1e644bdb3b

I would email the seller and ask for the ohm reading across the coils to confirm they are within spec.

I just swapped mine over and absolutely no kickbacks since

also, starting procedure mentioned above makes everything safer too.

good luck
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