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Post by bob123456789 on May 9, 2017 14:24:15 GMT -5
aus. One thing you may need to consider that isn't obvious. Check your states requirement for driving this. Most states >49 cc requires a motorcycle license. Unless you already have it it may be an additional cost.
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Post by bob123456789 on Mar 7, 2017 11:28:56 GMT -5
rockynv or anyone?
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Post by bob123456789 on Mar 6, 2017 14:04:18 GMT -5
I got a new exhaust gasket and put it in. Now when I turn it over it won't fire at all. Not when I have the air breather box connected or even when it is disconnected and I spray starting fluid into the card intake.
When put an old spark plug in the boot then ground it and turn it over I get spark.
This seems to be a fuel issue. How do I isolate it down to carb, fuel pump, fuel filter, ...? I recently put a new fuel filter, some fuel hoses and a new vacuum line between the fuel pump and the intake. When I hold my hand over the carb intake it feels like there is good suction.
Any ideas how to find the fuel issue?
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Post by bob123456789 on Mar 6, 2017 10:25:30 GMT -5
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Post by bob123456789 on Mar 5, 2017 15:39:35 GMT -5
Once again I could use the good help of the folks here.
My Linhai 257 only fires when I spray starting fluid in the carb intake. This seems to be a fuel issue. How do I isolate it down to carb, fuel pump, fuel filter,...? I recently put a new fuel filter, some fuel hoses and a new vacuum line between the fuel pump and the intake. When put an old spark plug in the boot then ground it and turn it over I get spark.
Also I can't get the old exhaust header to seal tight in the new head It is loose even after I have tightened up both nuts. I will look around. Is there supposed to be an exhaust gasket on this engine?
As background for those who haven't been following my work recently here I am just finishing up a replacing the head, the piston and the rings. When I put it together the first time I had small leaks of both antifreeze and oil. I am just putting it together the second time. It is too early to say if the leak is now fixed.
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Post by bob123456789 on Mar 1, 2017 13:22:15 GMT -5
Okay. I will copper coat the new gasket now and let it dry for 24 hours.
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Post by bob123456789 on Mar 1, 2017 7:45:37 GMT -5
If I put the head on without the gasket the acorn nuts touch the head when hand tighten. Here are pictures of the head with the acorn nut and the head-block joint, both with no gasket. Next steps?   |
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Post by bob123456789 on Feb 28, 2017 9:35:01 GMT -5
rockynv you raised the following issue.
"I could not see clearly enough from the picks if both sides of the head gasket are matching the machining of the head and cylinder. When you put the dowels in the head and lay the head gasket in place on it is the alignment good or are there areas where it just barely covers the cooling ports?"
Does my picture in post 35 address your questions?
I will use the old acorn nuts. See working late and not being able to go get replacements them paid off!
I really want to get this thing back together so I can ride it soon.
What steps do I need to follow to ensure that if I put it back together again it doesn't leak this time?
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Post by bob123456789 on Feb 27, 2017 19:27:41 GMT -5
I will get some nuts, lock washers and flat washers to replace the acorn nuts tonight. This is what I took all my measurements with: www.harborfreight.com/6-in-digital-caliper-with-sae-and-metric-fractional-readings-62569.htmlThe way I measured my dowel pin hole depths in both the head and the block was to measure the length of the dowel. Then I put it in the dowel pin hole. I then measured the amount of the dowel sticking out of he holes and subtracted it from the total dowel length. Is that what you meant when you said to use a T square micrometer? "Dowel Pin height must be less than the cavity depth" Dowel Pin Hole Head + Dowel Pin Hole Block > Dowel Length ~9.0 mm + ~8.0mm = 17.0 mm 17.0mm >15.9 mm |
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Post by bob123456789 on Feb 27, 2017 14:33:52 GMT -5
rockynv. Here is a picture of the spare new gasket (not the one that leaked.) sitting on the new head with the dowels in place.  When I put it together last time I followed the steps from the shop manual which are here: www.manualslib.com/manual/908522/Linhai-2004-Atv-260.html?page=61#manualand here: www.manualslib.com/manual/908522/Linhai-2004-Atv-260.html?page=62#manualShould I use grease on the dowel pins when I reassemble it this time too help them seat deeply in the holes? Something I thought of is I didn't clean or oil the stud threads before putting the nuts on again. While this have impacted my torques? I am not seeing anything real obvious as to why it is leaking oil and antifreeze. Maybe a slight amount of rust in the dowel holes in the block? |
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Post by bob123456789 on Feb 27, 2017 10:12:33 GMT -5
Dowel Pin Hole Head + Dowel Pin Hole Block > Dowel Length
~9.0 mm + ~8.0mm = 17.0 mm
17.0mm >15.9 mm
Please note that the dowel pin hole measurements are approximate since I had to insert a dowel pin and then measure the amount remaining out of the hole.
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Post by bob123456789 on Feb 27, 2017 5:33:44 GMT -5
Okay cyborg55 given it is a common problem in bike issues how do I identify the issue I am facing and solve it? We have the measurements in post 21 to work with.
dollartwentyfiv. Mine is definitely a Linhai 257. I think that the reason the additional hole doesn't show up on the block is because those holes on the head don't connect to the block. The hole on the head connects to a rubber hose that I am guessing is connected to some emissions stuff.
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Post by bob123456789 on Feb 26, 2017 15:57:39 GMT -5
Rockynv. The extra holes you asked about on the head which aren't covered by the head gasket I am guessing are emission stuff related. That hole is right by the exhaust valve and eventually connects to a large black cylindrical thing that has the other side open to the open air. On the head there is a hole for the purpose and two holes to screw it down.
The thing on the new head not covered by the gasket which you asked about is a tab that has machined surface flat with the head. In the picture there is a shadow that looks like it is a hole. Nothing is going through it.
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Post by bob123456789 on Feb 26, 2017 14:44:02 GMT -5
cyborg55. When I put it together last time I was able to torque it to the recommended torque and still had the small leaks.
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Post by bob123456789 on Feb 26, 2017 11:36:03 GMT -5
Here is a pic of the head gasket I have that is spare from a gasket kit I bought. It has not been copper coated yet.  |
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