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Post by bob123456789 on Nov 22, 2016 14:30:53 GMT -5
Good one Tortoise! I should phrased that differently.
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Post by bob123456789 on Nov 22, 2016 14:24:39 GMT -5
I have a Haynes Scooter manual. While it doesn't have the specific steps for a Linhai 257 cc it does have the steps in general to remove from a 4 stoke scooter engine the cam chain tensioner, the chain and the sprockets and how to reassemble them (sections 2B8 and 2B9). I have scanned them and they are attached as pictures. Can you look them over and confirm that in general these are he steps I need to follow? What do I need to do differently for a Linhai 257 cc? Obviously I wouldn't remove the seals or the sprockets like they suggest, just move the chain 1 sprocket cog. Can I disconnect the chain at the open cover using a connecting link (like a regular chain) and move it one way or the other so I don't need to pull everything apart? Thanks a lot.
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Post by bob123456789 on Nov 22, 2016 10:30:18 GMT -5
One last question. If the timing chain did jump a cog on the sprocket, what is likely to have caused that and do I need to fix it? For example the tensioner is worn out, the tensioner spring is weak,...
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Post by bob123456789 on Nov 22, 2016 10:20:14 GMT -5
I should have the camera by tomorrow. Maybe I got the last one.
I will go to Cycle Gear and get their feeler gauges since I haven't opened the ones from HF yet I can return them.
This is my first time doing this. What are the steps I need to follow to get the issue with the timing chain correct?
1) Drain oil 2) Remove timing chain cover. 3) Loosen then remove timing chain tensioner 4) Remove timing chain 5) Find top dead center. How? Does having the marker seen in the hole above the oil file plug lined up do this? 6) Set the intake and exhaust valve clearances. Are the correct settings intake valve is .004" and the exhaust is .005"? 7) Put the engine covers back on. 8) Put oil in the engine. 9) Put the spark plug back in 10) Connect the battery 11) Check compression 12) If the compression is good put everything back together. 13) If the compression is bad use the camera to inspect the cylinder/valves through the spark plug hole.
Thanks for everyone's help with this.
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Post by bob123456789 on Nov 20, 2016 19:29:56 GMT -5
So I have followed these instructions up to page 6. www.itistheride.com/Help_257cc_valve_adjustment_tutorial.pdfWhen I line up the mark on the sprocket with the timing chain with the one on the housing at the hole just above the oil plug I can't ever make the triangle on the flywheel line up with the mark on this housing. I have rotated it counter clockwise one revolution 7 times until the marks on the sprocket align again and I can't ever get them to line up in the hole above the oil fill plug. The only two things I can think of trying are: 1) I could line up the marks on the timing chain sprocket then put a plastic zip tie in the spark plug hole and measure the length in the cylinder. Rotate the variator nut one revolution until the marks line up again. Then repeat this several times until I found the one with the shortest measurement or top dead center. 2) I could try to rotate the variator nut a bit at a time until I can find the triangle on the flywheel. Does anyone else have any advice how to solve this?
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Post by bob123456789 on Nov 20, 2016 10:44:16 GMT -5
Any advice from those who have done this before I start? Are these the best steps to follow? Is there any way remove less stuff (the seat, the covers,....) www.itistheride.com/Help_257cc_valve_adjustment_tutorial.pdfAre theses the correct settings? The intake valve is .004" and the exhaust is .005". Off to harbor freight to buy a feeler gauge and a valve adjustment tool. Just in case the valve adjustment doesn't get my compression up I ordered this: www.amazon.com/gp/product/9803664832/ref=od_aui_detailpages00?ie=UTF8&psc=1Hopefully it works as good as the one RockyNV pointed out. It is more money but is in the US and I can have it before the long weekend when I will have lots of time and good weather to work on this.
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Post by bob123456789 on Nov 19, 2016 10:42:04 GMT -5
If it helps to diagnose the issue it has been stored indoors in a warm humid part of Texas for the last year.
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Post by bob123456789 on Nov 19, 2016 10:24:00 GMT -5
I just got back from my test ride.
I put 1.7 ounces of the zMAx fuel treatment in 1/2 full gas tank. I let it warm up until the cooling fan came on. I then put 2.4 ounces in my oil. I filled my gas tank with 1 gallon of premium gas.
When I left for my test ride it was just like before. Didn't have enough get up and go to carry me down the street. Died 6-9 times and needed to be restarted. Eventually I could get it to carry me without dying.
I drove it roughly 30 minutes and 10 miles.
As much as I hoped for it I saw no real change in the engine's operation.
What next?
RockyNV do you still think I should get feeler gauges and check the exhaust valve adjustment myself? Are my symptoms those of an exhaust valve not in adjustment? Most of its life it was stored outside in a dry part of Texas under a covered shading in a parking lot . I don't remember water vapor coming out of the exhaust pipe. The muffler seems functional. The center pipe doesn't move at all when I try to move it.
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Post by bob123456789 on Nov 18, 2016 16:58:07 GMT -5
Thanks rockynv.
I sure hope it works!
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Post by bob123456789 on Nov 18, 2016 9:44:19 GMT -5
No I am not confident in the mechanics ability which is why I am here. To me it felt like he had lots of very expensive guess work going on. As an example I saw no compression test being done to support his recommendations of a valve adjustment or valve job. Don't get me wrong, I value experience and know that others know more issues and that I can learn from them. I haven't used him before this bike and have no history with him.
I bought some zMax fuel and oil treatment yesterday. I will try that next (hopefully tomorrow morning). My question is how long of a test ride should I take after using the zMax. I want it to be long enough to see if it works but don't want to cause any damage to the engine.
Thanks for the perspective on the 250's. I haven't got to a point yet where I can fairly judge the performance. I hear you though. I look forward to being in that situation. Does replacing the fuel pump with a larger vacuum one or a electric one help with burning valves?
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Post by bob123456789 on Nov 17, 2016 11:16:06 GMT -5
Thanks RockyNV.
The symptoms (low power, dies at idle,...) were there before the valve adjustment. The mechanic thought that the valve adjustment would fix them. It has 6,000 miles which seems to fit the normal valve adjustment schedule. The valve adjustment had no impact on the symptoms. The scooter had been sitting before I got it and has been sitting a lot of the time since while I try to get it back to rideable shape again. The valve adjustment by the mechanic was done after it sat overnight.
I haven't heard of ZMax. Has anyone else had any experience using it? I'll try to read up on it.
I have a narrow window when my local weather lets me work on it. I am moving into the favorable period again. I would really like to get this thing up and going reliably very soon before I can no longer work on it due to weather.
Should I mess with Zmaz or other solutions or should I start pulling the head? I have not pulled the head before and would be working alone. But with a solid support team believe I could do it. It may not be as quick as if I had it done by a mechanic but I do work for free.
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Post by bob123456789 on Nov 17, 2016 1:12:45 GMT -5
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Post by bob123456789 on Nov 17, 2016 0:45:22 GMT -5
Cyborg.
Which side cover? How do I know I have the compression stroke?
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Post by bob123456789 on Nov 7, 2016 21:27:29 GMT -5
Thanks for the suggestion Cyborg.
It was sitting for a fair while not turned over. Are any of the long shot suggestions work in s a situation like this before pulling things apart? Soaking the rings in diesel ....
Is it worthwhile looking in with a borescope before pulling things apart?
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Post by bob123456789 on Oct 12, 2016 13:24:19 GMT -5
Another question. If it is the rings should I get the rings or the rings and piston?
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