Since I've seen some questions on this I took some pictures and will provide instructions on a valve adjustment for the UT400. This should be the same for the 550's and other various Coleman/Hisun single cylinder models with the cylinder slanted aft.
I have seen several people ask of it is really necessary, and read several reports of valves being out of adjustment from the factory. My valves were .004" intake, and .010" exhaust with about 5 hrs on the machine. I've seen different numbers thrown around for factory spec, but I decided to go with 0.005".
This is called valve lash. What is is is a gap between the rocker arm and the valve then the camshaft isnt opening the valve. Why does it matter? If it's too large the valve doesn't open all the way, if it's too small the valve dosent close. This can cause valve damage (overheating) as well as loss of engine power (burned fuel is going out exhaust rather than pushing the piston dow).
Tools required : 5MM Allen wrench, 10MM box wrench, needle nose pliers, flat feeler gauge set, rags
First you need to remove the fan cover on the passenger side. There is a cooling vent hose on the back side, remove the hose clamp and slide it off. From there there are 4x 10mm bolts holding the cover. The forward ones can be accessed from under the seat.
Next remove the spark plug from the drivers side. Carefully wiggle the spark plug wire off. Grip it as low as possible and give it a little twisting motion as you pull it off to help free it. Its a tight fit for a socket, but there is a sheet metal wrench in the toolkit that fits it. Unscrew the plug and set it aside. This allows you to spin the motor over freely with no compression to fight. When you reassemble this is a good opportunity to switch to an NGK iridium plug for better performance/less fouling DR8EIX)
Next you need to remove the intake and exhaust valve covers. The intake us the forward one. There are 3x 5MM Allen screws to remove. The Exhaust is the rear with 2x 5MM Allen bolts. Both covers have O-Rings instead of gaskets and are reusable. When you remove the rear be careful and use your rags as there will be oil that drips out.
Next up we need to spin the motor over to top dead center. Grab each rocker arm and give em a little wiggle up and down. Spin the engine over by grabbing the fan with your other hand. Spin the engine over until both rockers have some wiggle and are loose.
Once both rockers are loose slide the feeler gauge in like shown above. Try different feelers as needed to determine your starting spec. You should feel some drag but still be able to move the feeler without too much force.
If you need to adjust, use the 10MM wrench to slightly loosen the locknut, then with the correct feeler gauge in place, tighten the top square nut while wiggling the feeler in and out. Once you have it right you need to tighten the 10mm lock nut without moving the square head bolt. Once the lock nut is tight recheck the clearance.
That's it, button everything back up and make sure you have it all reassembled before running it again.
If you find this helpful give me a thumbs up or comment. If you have any questions or need more help let me know. If there's interest maybe I'll do some more of these
Brand new Joyner CV AXLES are waiting to be unloaded at LA port and then be sent to warehouses in Charleston, TN , BALTIMORE, MD and Groveport, OH. Estimate they will be available for shipments to end customers in about 2-3 weeks.
These CV AXLES are ordered in February this year and now it is middle July. Very long time to get these parts. Qty for each model is not big. Detail as below:
S/N Part No. Description Charleston, TN BALTIMORE, MD Groveport, OH Total
1 D650.03.02.02.00 650 Sand Spider Rear left 3 2 3 8
2 S650.03.02.02.00 650 Commando Rear 7 6 10 23
3 TR1100.03.01.03.00 TR1100 Front 3 3 4 10
4 D650.03.02.03.00 650 Sand Spider Rear Right 3 2 4 9
5 S800.03.02.02.00-R2 800 R2/4 Rear Shaft 4 4 6 14
6 TR1100.03.02.03.00 TR1100 Rear 6 5 9 20
7 S650.03.01.02.00 650 Commando Front Left 3 3 4 10
8 S650.03.01.03.00 650 Commando Front Right 3 3 4 10
Below items are also available. These items can be shipped in days
1. 800 Renegade R2/R4 Front outer cage --- 5 pieces
2. 800 Viper SV1100 Drive shaft rear Left outer cage --- 5 pieces
3. 800 Viper SV1100 Drive shaft rear left inner cage --- 3 pieces
1. 650 Commando Left Front / 650 Commando Right Front /650 Sand Spider Rear Left / 650 Sand Spider Rear right / OUT CAGE 2 pieces
2. 650 Commando Rear OUT CAGE 1 pieces
3 Trooper Front / Trooper Rear / 800 R2 R4 Rear OUT CAGE 2 pieces
4 650 Commando Left Front / 650 Commando Right Front INNER CAGE 1 pieces
5 650 Sand Spider Rear Left / 650 Sand Spider Rear right INNER CAGE 1 pieces
6 650 Commando Rear INNER CAGE 1 pieces
7 Trooper Front / Trooper Rear / 800 R2 R4 Rear OUT CAGE INNER CAGE 2 pieces
Anyone who need above items please contact me at [email protected]. Thanks.
Other Joyner items needed, you can also contact me and I will try to help.
Have good day
Casey / Leaf Asia
By Spring Brake Thingy
Would like to let everybody with the 23' Z Force units know that Spring Brake Thingy now has a parking brake available for these units. Pretty easy install, the brake pedal does need to come off for a couple holes to be drilled, but that's not all that difficult.
These are all made here in the states, like all of our other models.
see it at:
Mods: if we need to do something as a vendor please let me know, couldn't find any info and don't want to brake any rules......
By Michigan sport.
I'm sure many of you are aware of Michigan's emergency brake requirement. I'm wondering if anyone has a good solution.
Beyond paying the few fab places $$$$.. I'm curious is there another rear caliper with e brake style that would interchange with slight mods to the Maverick sport rear mounting bracket?