200x rebuild advice

[oldskool]

Ok, I finally got this sucker rebuilt and would like some advice before I kick it off the first time.

It's got a 12:1 wiseco piston in it now so I assume it'll need to be rejetted. This shouldn't affect it in neutral though should it? Just to get it running?

Also the cam chain is pretty loose now so should I just open the adjuster and try to start it or wait until I get it idling and then open the adjuster? I wasn't sure if it could be so loose it would throw the timing off.. That piston has a big dome on it compared to the old flat top and I know things are closer in their now..

Trying to get it off to a smooth start... Thanks for your advice! - DAVE

[Liquid-Darkness]

The manual says; Start the engine and allow it to idle. Remove the cap and loosen the cam chain tensioner adjuster bolt. When the cam chain tensioner adjuster bolt is loosened the cam chain will automaticly position its self to provide the correct tension. Tighten the adjuster bolt and replace the rubber cap. Tourqe to 15 foot pounds. The adjuster bolt you turn is the one thats wider and near the base.

Here is a good start for jetting.

1. Jet your main up 3 from stock or more, so your WOT sputters from being rich, then jet your main jet down till you are one under sputtering and rev clean at WOT. Pull your needle up one setting. Find a gentle slope that you can ride in 2nd or 3rd gear. Look for something that will put a decent load on the engine. This will be your tuning test area.
2. Make the recommended jetting changes. Always start rich and work leaner.
3. A basic outline of which jet is active at a particular throttle setting:
Pilot Jet = 0 to 1/4 throttle. Needle = 1/4 to 3/4 throttle. Main Jet = 3/4 to Full Throttle.
● Changing the Main Jet size won’t affect how your engine idles or runs at 1/4 throttle.
● Engine RPM isn’t what determines which jet is active - only throttle position does this.
4. Start and warm up the engine, then ride your ‘test hill’. Any point where you feel the engine stumble or hesitate indicates a rich condition. Note the throttle position and modify the corresponding jet (1/4 to 1/2 throttle = leaner needle. 3/4 throttle or more = leaner main jet).
5. Only change jetting by 1 step at a time, and 1 circuit at a time (don’t change needle and main at the same time). Re-check after every change.
6. Once the engine runs smoothly throughout, you’re jetted.

If you ever notice an abrupt change loss of power, or engine sounds changes, shut it down.

[oldskool]

Yes, It is well oiled including the cylinder...

How do you adjust timing chain without running it?

[Liquid-Darkness]

You don't. It needs to be running to adjust it. I don't think your bike will hurt from not being jetted while idleing. If you are using low octane fuel, you might overheat so make it quick. 12:1 compression requires straight race fuel. Then jet as outlined above.

[oldskool]

I've been going by the manual so thats what I thought too.

You think it'll get too hot on 93? maybe with an octane booster?