Need Help Low Cost Valve Job on a Linhai 257 cc  By  bob123456789 (Read 4,273 times)

I have a fairly new to me Linhai 257 cc. It has 6,000 miles on it.

I just had a mechanic adjust the valves. After the valve adjustment it has low power and wants to die until it warms up. The mechanic explained to me that the valves had never been adjusted and that the exhaust valve and its seat have been damaged. He believes that this is causing this behavior.

I want to find a way to fix this problem with a low cost. I see Scrappy dog scooters has a new head here for $150 (VOG Cylinder Head Complete):

www.scrappydogscooters.com/LH170MN_Linhai_257___275.html

Here is someone who has valves for $38:

www.ebay.com/itm/MANCO-TALON-260CC-LINHAI-260-300-ROKETA-MC-54B-VALVES-REBUILD-KIT-STEM-ASSEMBLY-/310696734926

What options exist for me to fix this at a low cost? Can I pull the head and have someone grind the valve seats and install new valves? Can you point me to how to find someone to do this?

Any other ideas?

Also check for an intake valve cover orientation issue.

take out plug screw in compression tester crank till you get highest if over 125 psi or over that even better 150 to 165 psi great. If you take a small amount squirt a little oil in cylinder and recheck if it comes up rings are weak if no change valves need to be recheck. also you came do a hot test if you don't get burned and compared them. But if you get 150 or better you need not go further..

most testers have adapters with kit no just engage engine to do test.

Okay it finally cooled down enough to do this.

The compression tester I got from O'Reilly's tool loan program has a 14 mm connection. The spark plug hole in the head is 12 mm.

What is the best way to deal with this? I don't really want to spend more money than I need to.

I appreciate any ideas. Thanks.

If you going to keep riding you scooter a few tools you should have feeler gauges,air gauge, tire gauge, compression gauge, screwdriver set common and Phillip.

Finally got the compression test done. The weather has been brutal.

I bought the gauge from Harbor Freight. Here are the results:

Cold
Dry Wet
psi psi

Warm
Dry Wet
psi psi

Since it didn't change when I added oil does this mean that it is the rings? If it is and the rings are done should the valves be done at the same time?

What do I do? The options I can think of are:

1) Leave it alone and ride it that way
2) Sell it as is
3) Fix it myself
4) Pay someone to fix it.
5) Any others?

Some background. It isn't my only transportation. I can't afford to pay to have someone like the mechanic I went to fix it. The weather will be turning in my direction in a couple of weeks for the next several months. I have done moderate amounts of mechanical work on cars. Not pulling an engine apart. I haven't done as much on scooters. I have changed the starter clutch on this one. I work for free and can devote a fair amount of time to this once the weather turns. I can follow instructions well and am detail oriented.

Does anyone know someone who does this kind of work inexpensively?