Kymco 90 oil strainer question

turbofiat124 · 12-10-2021, 08:28 AM

Greetings. I haven't been on here in awhile. I bought my daughter a 2007 Kymco 90 Mongoose for Christmas. The same guy who gave me the Tao Tao Brava several years back.

I guess Kymco is considered Chinese. Depending upon if you consider Taiwan a sovereign nation or a runaway Chinese republic...

The guy said the belt was slipping on this thing. After removing the cover I discovered it was leaking oil and had saturated the belt, clutch, etc.

I assumed it was the seal behind the clutch so I replaced it. Cleaned everything up.

While I was at it I decided to do some maintenance on it. On the bottom of the engine there is a screen filter that looks like a thimble. It's hard to get to due to the frame.

I couldn't get it back in. So I left it out for the meantime. I later discovered from this photo that the screen goes inside the spring. It had fallen out when I removed the cap and wasn't sure how it went back in. So that may have been why I was having issues.

Well I go on a test drive and afterwards notice oil gushing from the seal behind the secondary.

Could I have replaced the wrong seal? But the engine was not leaking that much oil before. I found a new seal from a bearing store in town.

QUESTION: Does this strainer act as an oil restrictor? This engine was not leaking that much oil before I removed the strainer. I assumed the oil leakage was the seal behind the clutch.

I'm going to have to lean this bike on it's end to get this thing back in.

I'm curious about this strainer. If it acts as a restrictor and because I removed it, it's pumping way too much oil up into the engine and forcing it out that seal. I'm baffled.

**JerryHawk250** · 12-10-2021, 08:55 AM

Check that the crank case vent isn't stopped up.

david3921 · 12-10-2021, 12:54 PM

It's an oil strainer. Basically, the oil filter. The oil flows over the outside of the strainer into the engine sump as part of the oil loop. It's best to pull and clean it during an oil change.

TxTaoRider · 12-10-2021, 01:09 PM

I cant speak to your specific model, but I've got an arctic cat dvx300, which is a rebrand kymco mongoose, and it's a really well built and trouble free machine. The kymcos are great .

12-10-2021, 08:55 AM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,723	Check that the crank case vent isn't stopped up. __________________ 2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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12-10-2021, 12:54 PM	#3
david3921 Join Date: Feb 2009 Location: Michigan Posts: 1,043	It's an oil strainer. Basically, the oil filter. The oil flows over the outside of the strainer into the engine sump as part of the oil loop. It's best to pull and clean it during an oil change. __________________ 2012 Kawasaki Versys 1984 Honda Magna V65 2016 Rhino 250 2016 Tao Tao 125D
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12-10-2021, 01:09 PM	#4
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	I cant speak to your specific model, but I've got an arctic cat dvx300, which is a rebrand kymco mongoose, and it's a really well built and trouble free machine. The kymcos are great . __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
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