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loss of power up hills, and consuming oil yet no smoke.

 
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loss of power up hills, and consuming oil yet no smoke.
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timothy.firth



Joined: 14 May 2014
Posts: 8
Location: seattle

Post loss of power up hills, and consuming oil yet no smoke. Reply with quote
hello all,

I am new to the forum but I was hoping I might get a little help. I have a 2003 chetak and it has recently starting consuming oil and I am losing a bit of power (low end and up hills). I have cleaned the entire engine in search of leaks and don't see any. I also don't see any smoke at any time during a ride or while in the shop. I just pulled the plug to do a compression test and saw that there was some oil on the plug treads. The compression reading was Dry-195 wet-210.
I am going through about a half of a quart every 4 days, though I do ride a lot. Sometimes 30 t0 6o a day.

I was also getting some back fire going down hills so though I was running rich. I tried to tune the carb down and the backfiring has stopped but I feel no improvement regarding power loss.

New plugs. full synthetic.

I hope you can point me in the right direction.

Very best,

timothy
Tue May 20, 2014 10:59 pm View user's profile Send private message
timothy.firth



Joined: 14 May 2014
Posts: 8
Location: seattle

Post Reply with quote
Full disclosure. I have the feeling that the carb is leaking gas into the motor. I just gave it another oil change as I had the suspicion that the old oil smelled of gas. I asked other people and they were on the fence. So I really took note of the way the synthetic smelled and just went outside to smell the oil after running it for a few days, I swear it has a petrol thing going on. Now how normal that is I have no idea. I know if gas is really leaking in its horrible for the engine, but perhaps gas is getting in and the increased fluid is adding pressure, then burning off as the day goes on. and with it taking aways some oil???? Does that sound crazy?

Maybe the needle isn't seating correctly???

Also, The milage has gone down quite a bit over the last 6 months. Im at about 60 per gallon.

Thanks
Tue May 20, 2014 11:08 pm View user's profile Send private message
donarntz
Site Admin


Joined: 01 Jul 2007
Posts: 235
Location: Austin, TX

Post Reply with quote
Make sure to always close the fuel valve when not riding. Fuel can seep into the oil that way.

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Thu May 22, 2014 2:30 pm View user's profile Send private message AIM Address
rufusswan



Joined: 29 Sep 2007
Posts: 1786
Location: Taneyville, Missouri

Post Reply with quote
Yes, if you leave the petcock ON or the float valve is being held open, the you can flood the oil sump and the case will seep oil. And you may not help the situation by running synthetic oil. Your bike has a WET clutch which often 'slip' with synthetic.

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Fri May 23, 2014 3:19 pm View user's profile Send private message Send e-mail MSN Messenger
timothy.firth



Joined: 14 May 2014
Posts: 8
Location: seattle

Post Reply with quote
I just rebuilt my carb, put in a new plug and solid core wire and cleaned up the air filter.
That seems to have helped with the oil consumption, though it hasn't eliminated it. So I suppose I'm on the right track. The power loss is still very present. are you saying the synthetic might be causing subtle slipping and therefore reducing power output? Seems like I would notice.

Sorry for the late reply. I didn't get a notification of a response.


Best
Tue Jul 01, 2014 4:06 pm View user's profile Send private message
donarntz
Site Admin


Joined: 01 Jul 2007
Posts: 235
Location: Austin, TX

Post Reply with quote
You said you did a compression test? Is the compression comparable to what is listed in the repair manual? If it's low, it probably IS burning some oil as these engines do need to be rebuilt eventually. Using a thicker oil helps. I would try going up to a 5w50 quality motorcycle oil from a motorcycle shop (look for a shop that sells a lot of dirt bikes, and you'll probably find oils like motul and bellray). I've run 5w60 synthetic in my scoot with no ill affects besides a slight decline in MPG. I now run Rotella t6 5w40 synthetic in everything I own, be it car or motorbike or lawnmower. Make sure it is wet clutch compatible "JASO M". This isn't an issue if you buy a motor oil specifically for a motorcycle as I think they all are. I've personally never had an issue with synthetic oil in my scooters or motorbikes with the JASO rating).

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Tue Jul 01, 2014 4:58 pm View user's profile Send private message AIM Address
timothy.firth



Joined: 14 May 2014
Posts: 8
Location: seattle

Post Reply with quote
The compression text went as follows: Dry 190psi then with a teaspoon of oil 210psi. What I gather from the Chetak manual is that its above spec, but there is a 20psi difference between the wet and dry test. I don't know if that should concern me or not. Any thoughts?

I am running a 5w40 full sy. that is designed for a wet clutch.

I just tuned my valves. The intake was .001 to tight. Now the exhaust and the intake are between .003 and .004

I took it in to my mechanic hoping he could adjust the carb better than me, though after all was said and done I didn't notice any change in power. oil consumption remains lower but im still chugging up the hills... if something I should try pops into anyones head I will give it a try and let you know what happens.
Mon Jul 07, 2014 5:12 pm View user's profile Send private message
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