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Post by dmartin95 on Sept 12, 2014 13:42:56 GMT -5
My Bintelli Havoc is now at 1025 miles. The manual calls for the valves to be checked at 500 miles.
However, I've always gone with: "If it aint broke, don't fix it"....
My Havoc has an absolute smooth idle..... It does not rev up and down at all like some of my other scoots, it really does purr like a kitten. All the way from to take off, to long stretches at WOT, it's very smooth and I'm getting GPS speeds of 62 MPH on level terrain (I weigh 160lbs).... And it starts like a champ too! I never give it the throttle to start it, cold or hot.....
If I was having an issue like not starting when hot, or just anything indicating the valves need adjusting, well, then I would adjust them without hesitation.... But my Havoc is running so good, I'm extremely hesitant.....
So anyhow, in short, what's your thoughts on valve adjustments? Do it according to operators manual recommendations or do it according to how the engine is running?
Thanks - Dan
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Post by rcq92130 on Sept 12, 2014 14:05:36 GMT -5
I guess I don't get what the downside is.
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Post by dmartin95 on Sept 12, 2014 14:21:17 GMT -5
The downside as I see it is opening the engine. Every time you open the engine, you expose it to risk... A couple of granules of sand falling into your valves could scratch up the internals... There's also a gasket there... Sometimes the gasket can be saved and reused and yes, I know you can even make a gasket....
But then it comes down to do I want to go through the work for nothing.....
What I'm really seeking to know is if there's some benefit to adjusting the valves of a perfectly fine running engine... I am not a scooter engineer and do not know if there's some benefit that I'm unaware of....
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Post by dmartin95 on Sept 12, 2014 14:39:51 GMT -5
Oh yeah, and another downside is that I've never done it before. I've watched a few videos and purchased a feeler gauge, but as I've never done it yet, i'm just a bit nervous. That may sound stupid to the seasoned mechanics because the videos I've seen does seem to illustrate it's a rather mundane job, but still, I'm worried about screwing up an awesome running engine.  |
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Post by geh3333 on Sept 12, 2014 14:58:18 GMT -5
The only thing that can happen by checking the valves is a leak in the valve cover " due to taking it on an off " but being this would be the first time it has been done you shouldn't have a problem . The valve cover gasket " rubber gasket" tends to become less effective the more times you removed the valve cover . Due to the gasket becoming wore out " flattens and degrades" .
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Post by urbanmadness on Sept 12, 2014 18:44:05 GMT -5
if it's gy6 based, and you are not having the symptoms of hard start or bad idle, then leave it be. Maybe plan on checking it at 1500 miles?
If it's not gy6 based, then it might be a good idea to check them since the manufacture recommends it at 500 and considers it part of break in.
Valve adjustments are NOT all that hard, but be prepared the first time you do one, as the first time you do it, it requires a bit more time. You develop a feel for the drag on the feeler gauge. Just take your time, and be patient.
A tip I give all new scooter mechanics is, use 1/4 drive ratchet sets instead of the 3/8 drive sets. It makes it much harder to over tighten nuts and bolts.
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Post by geh3333 on Sept 12, 2014 19:00:50 GMT -5
That's a very good tip " 1/4 inch instead of 3/8 inch " they are very easy to over tighten and strip .
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Post by dmartin95 on Sept 12, 2014 20:25:02 GMT -5
if it's gy6 based, and you are not having the symptoms of hard start or bad idle, then leave it be. Maybe plan on checking it at 1500 miles? Thanks guys! I appreciate the feedback. It is a GY6 based motor. It's Engine Type: BN157QMJ which is a ZNEN Longcase GY6 150cc. The motor doesn't "crank over" to start. You push the button and it just starts, hot or cold. The idle is the smoothest I've ever heard from a scooter. I've owned 4 spree's, 1 elite e and 6 "Chinese scooters" and I've never had one that runs this good. One more thing that has me concerned is I can't find what the clearances are. Bintelli makes good scooters, but terrible support and documentation. They make one manual for all of their scooters. It covers both 50cc and 150cc but has nothing to differentiate between the two. It says in the manual to set the clearances on both, the intake/exhaust to .003 in. The manual is written for a 50cc Bintelli scorch. However, I found other resources for 150cc gy6 to set the intake to .005 and the exhaust to .007... What do you guys set your clearances to? |
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Post by geh3333 on Sept 12, 2014 20:43:23 GMT -5
That's what he meant by cranking over " whether is kickstarted or electric start that cranks the engine over "
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Post by dmartin95 on Sept 12, 2014 22:16:41 GMT -5
Geh3333 - Did you perhaps reply to the wrong thread?
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Post by alleyoop on Sept 12, 2014 23:15:19 GMT -5
I have a quality 62mm BBK on my 157qmj and I set both to .004 inch's and because of the quality I have only adjusted them once at little over 1K and I currently have 6K on the bbk. Some do the intake at .004 and the exhaust at .005.
Alleyoop
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Post by onewheeldrive on Sept 12, 2014 23:28:32 GMT -5
Every now and then I think about that---- adjusting the valves before any symptoms start of the gap(s) being too tight. If my scoot is running fine, I'll change the oil and that's pretty much it. I guess I'm curious as to what we'd benefit from by adjusting the valves before symptoms start, besides just avoiding poor/hard starting, lack of power...etc...etc.
I think Rockynv posted something about that at one time, not too long ago.
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Post by urbanmadness on Sept 13, 2014 0:14:58 GMT -5
Every now and then I think about that---- adjusting the valves before any symptoms start of the gap(s) being too tight. If my scoot is running fine, I'll change the oil and that's pretty much it. I guess I'm curious as to what we'd benefit from by adjusting the valves before symptoms start, besides just avoiding poor/hard starting, lack of power...etc...etc. I think Rockynv posted something about that at one time, not too long ago. Sometimes, it's the frog in the boiling water syndrom. You don't think you have lost any performance, but you have. It has just happened over a long period of time. When you finally adjust the valves you notice a huge difference in MPG or acceleration is better etc. |
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Post by urbanmadness on Sept 13, 2014 0:24:49 GMT -5
if it's gy6 based, and you are not having the symptoms of hard start or bad idle, then leave it be. Maybe plan on checking it at 1500 miles? Thanks guys! I appreciate the feedback. It is a GY6 based motor. It's Engine Type: BN157QMJ which is a ZNEN Longcase GY6 150cc. The motor doesn't "crank over" to start. You push the button and it just starts, hot or cold. The idle is the smoothest I've ever heard from a scooter. I've owned 4 spree's, 1 elite e and 6 "Chinese scooters" and I've never had one that runs this good. One more thing that has me concerned is I can't find what the clearances are. Bintelli makes good scooters, but terrible support and documentation. They make one manual for all of their scooters. It covers both 50cc and 150cc but has nothing to differentiate between the two. It says in the manual to set the clearances on both, the intake/exhaust to .003 in. The manual is written for a 50cc Bintelli scorch. However, I found other resources for 150cc gy6 to set the intake to .005 and the exhaust to .007... What do you guys set your clearances to? I seem to have the best results at .004 both intake and exhaust, but sometimes you end up with an od ball that will seem to run better at .005. I usually use the same for exhaust and intake. Your milage may vary. .005 and .007 seems like it would be a bit on the lose side. I would run at .004 and see what happens. Generally it's better to run looser rather then tighter but .007 seems way lose. Also, with these engines, the intake valve seems to hold the adjustment much better then the exhaust valve. The exhaust valve deals with a lot more punishment then the intake. Another side note: I can really see the Honda DNA in these clones when I work on my 1100CC goldwing. The valve adjusters are pretty much the same design as they are on the 50's and 150's. Just a bit bigger, and of course there are more of them. |
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Post by alleyoop on Sept 13, 2014 0:25:14 GMT -5
If a motor does not start on the 1st or 2nd SHORT hit of the start button something is not right. If you have to crank and crank the motor to start it needs some TLC.  Alleyoop |
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..BAD TO THE BONE..
