Pump premium and any old premix oil will run perfect in that bike, if it runs.

I'd be more concerned steering head bearings, swingarm linkage bearings, etc.






That 400 isn't a race bike. A 250f or 450f is a completely different animal.

More premix oil always makes more top end power. You can run a ratio like that if you jet for it. There is no real good reason to if it is still in a dirt bike. We ran Amsoil at 28:1 in our shifter kart engines. They see sustained high rpm though. I run H1R at 40:1 in 2 stroke dirt bikes.

Premix ratios and jetting are a counter intuitive thing. The less oil you run the richer the mixture actually is. At 20:1 it was running like poo because it was lean.

This post was edited by FMX_89 on Apr 15 2015 07:15pm

Yea I put some premium at roughly 36:1. Then I noticed, there was no idle screw. Not sure if I rattled it out or what. Either way thsts when I shut it down, seen the oil leak then found the clutch problem.

I rode it like 10 minutes and found all this shit wrong hahaha.
What ever

Clutch arrives in approx 2 weeks. We will see then, all my other stuff will be in by then

This post was edited by IB0T on Apr 15 2015 07:33pm

Cool deal. Cheap as they are all of my 2 stroke friends have had good luck with Tusk and Pro X clutch kits if you end up needing frictions and steels.

Finially got around to tackling that clutch nut off, had to borrow an impact. And that clutch tab piece is no where to be found, ans everything in there, gears, everything looks in good shape, no free play and intact. So the kick start that skips must have been clutch related.
good

Nothing left to do but wait for parts

Holy shit my clutch came in today haha
was suppose to be here between the 28-5th. And it got held up at the shop 2 days. I had to call to say wtf man.

The clutch ended up being the wrong one lol
after getting fed up and tried selling it for over a week, my girlfriend just talked me into keeping it....

New clutch cable and friction discs, bike works perfectly.
next was time to fine tune it. Dropped a pilot jet size, went over the carb again to measure things. All is good. Runs pretty good now, just a slight miss when holding the throttle 1/2 or 3/4 cruising.
Plug came out a little on the darker side. Drained the gas and mixed s fresh batch at 40:1 with a new plug. We will see how today's ride goes. Bringing 1 smaller pilot jet with me. ( as j will lug the bike down Bush trails and such, leaner pilot won't hurt me)

But yea, big difference when fine tuning it. Bike picks right up and wants to walk out from under my 160lb ass every gear.

And I forgot how much of a pig on gas these things can be when rriding hard. Damn

This post was edited by IB0T on May 9 2015 07:08am

2 smoke problems. You are correct, you can go much leaner on the pilot than most people think.

I went from 58 to 55. Just letting it idle and slowly warming up, then pulling the plug (e/ new 40:1 mixture) the plug is much more golden Brown. Things are looking up for the old girl.
I got a 52 incase it's needed.

This post was edited by IB0T on May 9 2015 09:07am

Ride went great. Done the fine tuning.
Next is this soft suspension and leaky fork seal