Oil Leak

05-25-2007, 10:54 PM

I have a oil leak that I can not find on my Roketa 167fml 200cc engine. It seems to come from the front sprocket cover ,but when I pull ithe cover no oil. It started after an oil change, so thinking it was the oil screen cover, I drained the oil after a ride and re-assembled the cover. It's still leaking. No visable leak higher up. Anyone had a similar problem with the 167 engine? Maybe a quarter size spot on cardboard, but with 600 miles on the engine I didn't expect this.

bfe71730 · 05-25-2007, 11:57 PM

Do you have a skid plate? some old oil might have gotten trapped there.

red2003 · 05-26-2007, 10:39 AM

Probably from the skid pan. Or, might be chain run off if you recently lubed the chain.

05-26-2007, 11:06 AM

Chain was lubed over 100 miles ago with a wax lube and no skid plate. I know it's not alot of oil, but it has been a consistent leak for the last 100 miles.

red2003 · 05-26-2007, 12:08 PM

Well then about all you can do is get everything spic and span clean, fire it up and look for leaks. Unless there's an oil fairy in your shop, it's gotta be coming from somewhere.

Jim · 05-26-2007, 12:32 PM

What kind of oil are you using?

ob1 · 05-26-2007, 02:53 PM

Take a piece of 35mm film negative, slice the side off of it so you get something resembling squared-off saw teeth. Then cut the whole strip narrower to make it easier to work with. It may take a few cuts to make just the right tool.

Work this between the output shaft and it's oil seal, in kind of scooping motion, go all the way around. Remove the front sprocket and spark plug, you may find it is easier to work the film in if you ease the engine over while in gear. Chances are there is a bit of trash in the seal, and your aim is to pull it out with the "saw teeth".

Works well on leaking fork seals, since they are larger diameter, you needn't cut it too narrow

05-26-2007, 08:15 PM

Rotella 15w-40w, MCB thanks for the info, I'll give it a try.

05-29-2007, 12:08 PM

Found the leak. Some sort of electrical sensor with two phillips screws holding it, had a bad o ring. Sensor was just foward of the front sprocket. The o ring still had mould flashing. 49 cents for a new o ring. I'm finding this bike is a challenge in a fun garage kind of way.

red2003 · 05-29-2007, 12:21 PM

That sensor is the crank trigger for the CDI. So the o-ring was sealing off the 2 bolts that hold the sensor to the crankcase? I'm not sure why there would be oil passages next to that sensor???

ob1 · 05-29-2007, 04:12 PM

Isnt there a gear indicator switch also located just forward of the sprocket?

Whatever it was, glad you spotted it and it was an easy fix.

I got an absurdly large assortment of o-rings at Harbor Freight, nice to have around!

katoranger · 05-29-2007, 08:32 PM

Quote:

Originally Posted by 45s19

I'm finding this bike is a challenge in a fun garage kind of way.

That was my thinking also. At least the bike runs and I am not trying to keep a 30 year bike running.

The tech level on these is within my abilities.

Allen

05-29-2007, 10:49 PM

The sensor has an o ring on its engine side. When I removed it a small amount of oil was present and it looks like there a hole that goes deeper into the engine case. So far its still holding after 20 miles.

red2003 · 05-30-2007, 07:56 AM

Quote:

Originally Posted by ob1

Isnt there a gear indicator switch also located just forward of the sprocket?

Ah, yes OB1!! That could well be it. That would make sense why it was sealed! You da man!!!

05-25-2007, 10:54 PM	#1
Guest Posts: n/a	Oil Leak I have a oil leak that I can not find on my Roketa 167fml 200cc engine. It seems to come from the front sprocket cover ,but when I pull ithe cover no oil. It started after an oil change, so thinking it was the oil screen cover, I drained the oil after a ride and re-assembled the cover. It's still leaking. No visable leak higher up. Anyone had a similar problem with the 167 engine? Maybe a quarter size spot on cardboard, but with 600 miles on the engine I didn't expect this.
	0

05-25-2007, 11:57 PM	#2
bfe71730 Join Date: May 2006 Location: South Arkansas Posts: 198	Do you have a skid plate? some old oil might have gotten trapped there. __________________ 2004 KAZUMA CHEETAH 200 2001 Yamaha Big Bear 400 1986 Honda ATC 250ES 1983 Honda ATC 200X 1974 Kawasaki KE100
	0

05-26-2007, 10:39 AM	#3
red2003 Join Date: Jan 2007 Location: Northern Vermont, USA Posts: 1,218	Probably from the skid pan. Or, might be chain run off if you recently lubed the chain. __________________ 2006 Roketa RSX200E MODS: YZ250F Muffler, Airbox delete with K/N style filter, Main Jet reamed 2 sizes over, Yamaha R1 Rear clicker shock on custom scissor linkage making 8 3/4in. of rear wheel travel!!! Battery relocated under seat.
	0

05-26-2007, 12:08 PM	#5
red2003 Join Date: Jan 2007 Location: Northern Vermont, USA Posts: 1,218	Well then about all you can do is get everything spic and span clean, fire it up and look for leaks. Unless there's an oil fairy in your shop, it's gotta be coming from somewhere. __________________ 2006 Roketa RSX200E MODS: YZ250F Muffler, Airbox delete with K/N style filter, Main Jet reamed 2 sizes over, Yamaha R1 Rear clicker shock on custom scissor linkage making 8 3/4in. of rear wheel travel!!! Battery relocated under seat.
	0

05-29-2007, 12:21 PM	#10
red2003 Join Date: Jan 2007 Location: Northern Vermont, USA Posts: 1,218	That sensor is the crank trigger for the CDI. So the o-ring was sealing off the 2 bolts that hold the sensor to the crankcase? I'm not sure why there would be oil passages next to that sensor??? __________________ 2006 Roketa RSX200E MODS: YZ250F Muffler, Airbox delete with K/N style filter, Main Jet reamed 2 sizes over, Yamaha R1 Rear clicker shock on custom scissor linkage making 8 3/4in. of rear wheel travel!!! Battery relocated under seat.
	0

05-26-2007, 11:06 AM	#4
Guest Posts: n/a	Chain was lubed over 100 miles ago with a wax lube and no skid plate. I know it's not alot of oil, but it has been a consistent leak for the last 100 miles.
	0

05-26-2007, 12:32 PM	#6
Jim Join Date: Mar 2007 Location: Abbotsford, BC, Canada Posts: 4,880	What kind of oil are you using?
	0

05-26-2007, 02:53 PM	#7
ob1 Join Date: Jul 2006 Posts: 499	Take a piece of 35mm film negative, slice the side off of it so you get something resembling squared-off saw teeth. Then cut the whole strip narrower to make it easier to work with. It may take a few cuts to make just the right tool. Work this between the output shaft and it's oil seal, in kind of scooping motion, go all the way around. Remove the front sprocket and spark plug, you may find it is easier to work the film in if you ease the engine over while in gear. Chances are there is a bit of trash in the seal, and your aim is to pull it out with the "saw teeth". Works well on leaking fork seals, since they are larger diameter, you needn't cut it too narrow
	0

05-26-2007, 08:15 PM	#8
Guest Posts: n/a	Rotella 15w-40w, MCB thanks for the info, I'll give it a try.
	0

05-29-2007, 12:08 PM	#9
Guest Posts: n/a	Found the leak. Some sort of electrical sensor with two phillips screws holding it, had a bad o ring. Sensor was just foward of the front sprocket. The o ring still had mould flashing. 49 cents for a new o ring. I'm finding this bike is a challenge in a fun garage kind of way.
	0

05-29-2007, 04:12 PM	#11
ob1 Join Date: Jul 2006 Posts: 499	Isnt there a gear indicator switch also located just forward of the sprocket? Whatever it was, glad you spotted it and it was an easy fix. I got an absurdly large assortment of o-rings at Harbor Freight, nice to have around!
	0

05-29-2007, 10:49 PM	#13
Guest Posts: n/a	The sensor has an o ring on its engine side. When I removed it a small amount of oil was present and it looks like there a hole that goes deeper into the engine case. So far its still holding after 20 miles.
	0