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Post by scootersteve420 on Oct 13, 2022 0:43:15 GMT -5
So what's up with this engine? I can't find anything online about it, nothing on YouTube either. It's a stock liquid cooled 49cc 4 stroke, Qlink Hawk. I wanted to adjust the valves but it's not like a 139QMB. There doesn't seem to be any nuts to loosen, to adjust them. I'll send a pic of the valves when I open the cover again. I'm more interested to see if anyone knows anything about this engine or point me towards a service manual. Engine numbers ibb.co/3Y4Jkd8View of engine ibb.co/9rC1prxThe engine numbers are hard to read, I believe they say: LJ1P38MB *11011336* |
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Post by aeroxbud on Oct 13, 2022 5:50:56 GMT -5
It's probably got shims to adjust the height then. You probably have to remove the camshaft to get to them.
But to just check them it's the same as any other newer motorcycle, you don't need to remove the camshaft. You need to check them on a cold engine. An owners manual might give you the spec.
It looks like they were sold only by one dealer in Dallas.
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Post by scootersteve420 on Oct 15, 2022 16:40:17 GMT -5
You're right, it's a shimmed 3 valve engine. I'm guessing the top two valves are intake and the bottom single valve is the exhaust? I'm able to remove the shims pretty easily by just sliding the rocker arms over and using a magnet to remove them. The single exhaust valve doesn't have a shim but the two intake valves do have them. Would this be normal as long as the clearance is right for the exhaust valve? It did start and run okay minus issues with a bad carb.
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Post by aeroxbud on Oct 15, 2022 17:00:22 GMT -5
There must be some way of adjusting the exhaust valve. The gaps can close up over time and burn the valve up.
It's a shame I couldn't find more information on the engine code.
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Post by scootersteve420 on Oct 15, 2022 22:36:15 GMT -5
Right! I couldn't find any useful information on it nowhere. Nothing on YouTube either. I ordered a 5 pack of 7.48mm shims, 1.20mm to 1.40mm to at least have one in the exhaust valve. I thought I'd start at the lowest thickness and work my way up. The exhaust valve has lots of play at top dead center where the intake valves are tight, maybe too tight. The scooter starts right up and idles but when I take off, it'll go with little throttle but when I give it half to full throttle it just bogs down but doesn't die. Could that be caused by too tight of intake valves? Or am I getting too much air with this red foam air filter?
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Post by aeroxbud on Oct 16, 2022 3:08:14 GMT -5
You usually measure the gap, then it you have to make adjustments. Measure the shim fitted and order the size to put it back in the correct range.
It could be getting to much air. I always run a stock air box of I can.
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Post by scootersteve420 on Oct 16, 2022 17:48:33 GMT -5
Right but nobody knows the valve spacing for this engine, the information is nowhere lol. I plan to try and get the intake to .004 and exhaust to .007 like the 139qmb and see how it acts. On the intake valve, I couldn't even get my feeler gauge between the gap because it was so tight. The exhaust valve doesn't even have a shim in it. It's just gone but doesn't there need to be a shim in there? I mean the exhaust rocker is way too loose the way it is without a shim. While running, you can hear the loose exhaust rocker ticking on the valve where there's so much of a gap. Stock airbox is on as well.
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Post by scootersteve420 on Oct 16, 2022 23:05:41 GMT -5
I've been doing some more digging. I came across the 2013 Yamaha Zuma 50. I've heard the Qlink Hawk 50 engine was a Yamaha clone but never could find out which engine they cloned. The engine looks almost like an exact match, almost like they used an actual Yamaha engine and stamped it with their own model number, even the Zuma specs line up with the Hawk. I thought I'd share this information for others like myself looking for hope. This may be the answer to getting the Hawk lined out. Fingers crossed. I'll update when I make progress or fail. 2013 Yamaha Zuma 50 Engine: ibb.co/9nfrTjy2013 Zuma Specs: www.motorcycle.com/specs/yamaha/scooter/2013/zuma/50f.html |
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Post by aeroxbud on Oct 17, 2022 4:13:57 GMT -5
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Post by scootersteve420 on Oct 17, 2022 19:27:27 GMT -5
Qlink has long been out of business I believe. That's what I've heard anyway. That brings up zero results for my area. The 2013 Yamaha Zuma 50f and the Vivo 50 engine's are the closest match to the Hawk 50 engine that I've found. Even the parts schematics look to match my engine. I'm going to go by the Zuma and Vivo tuning specs and see what happens. At this point I have nothing to lose with this scooter. I ordered a $3 1.20mm pad adjusting or shim for my loose exhaust valve. Whether that solves my problem or not, I will report back so future info seekers reading this don't waste money. If all is good, I may try ordering new valves because it probably needs them.
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Post by aeroxbud on Oct 18, 2022 4:43:23 GMT -5
Qlink is probably just a U.S. Based supplier. The actual company that built the scooter is probably going.
We had loads of That going on here ten years ago. Loads of people were setting up in business as motorcycle dealers. If you brought a certain amount, they would brand them anything you wanted.
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Post by fugaziiv on Oct 18, 2022 14:17:33 GMT -5
I was going to drop in here, but you figured out the engine on your own.
To the best of my knowledge no-one currently imports this Chinese version of the 3v engine in any brand to the US.
-Matt
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Post by scootersteve420 on Oct 24, 2022 21:16:55 GMT -5
I got my valve shim/pad adjusting in today, I went with the 2013 Yamaha ZUMA 50 (YW50FDB) part, the part # is 5ST-E2168-00-00. I installed it into the exhaust valve and man that sucker gets up and goes like it never has for me, no more bog. There's still a good gap between the rocker and shim, just need to up the shim thickness a couple mm's but it's finally getting lined out. Thank's aeroxbud! I don't think I would have figured it out without your help.
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Post by aeroxbud on Oct 25, 2022 3:22:50 GMT -5
That's great you are on the right track.👍
It's a strange engine, more advanced than the normal GY6. More like the 3 valve Vespa probably. I wonder why we didn't see more of them. Perhaps it's just a cost thing?
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Post by scootersteve420 on Oct 29, 2022 22:24:03 GMT -5
You're probably right. I don't see many Chinese scooters with liquid cooling, it seems like a fancy feature to have. The clutch and variator's are stamped with "JOG 90" which seems strange. It's running much better, thankfully. I'm thinking the intake valve's might be too tight though. It has great acceleration when cold but once it has warmed up, the acceleration becomes poor but still climbs back up to top speed, around 40mph, just slowly. It idles good and it's not stalling at stops anymore.
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