Suzuki RGV 150 running rich?

[pyrocam]

Can’t say too familiar with the 150s, but the cable should split, one to the carb, one to the pump. If the cable has been pulled it may be sitting up snagged on the adjuster. Basically as you twist the throttle the lever (under the cover) is pulled up allowing more oil to be pumped. Usually there is a line that when you pull the throttle to about ¾ it aligns the mark on the lever with one on the pumpbody. At this point there should be a mark on the carb slide that aligns with something & you adjust it so these 3 things are all in the right place.

Would have thought you’d get a good 4 or 5 fills to a oil tank, too long ago since I’ve had a road going 2 stroke. Any 150 owners comment?

well as you may be aware its a bit hot out, so I went for a spin. gave it some good rpm's etc. by the time I got home it was only spilling white smoke when I got 1/2way into the red. well all that I could notice anyway.

I might need to get under there with the fairings off and have a look.

does a bike get stuffed it its on its side or upside down? (I dunno like a fridge does)

thanks for your help again dave

[Ixion]

Fabulous advice, presumably he’s a learner, tell him to go as fast as possible, neat idea. And achieving what?

Typically when a 2 stroke is rich it will produce a lot of spooge from un burnt oil. Excessive smoking:..

As someone said, hammer the engine- need not be illegal speeds. Just make the engine work for its living for a while. Hard as possible, not fast. Hammering a 50ccc would be unlikely to break any speed limit. (more fun doing ti at speed, though but , )

IIRC, and IMHO, running rich on a stroker will produce smoke *IF* it's using premix or the type of injection system that injects the oil into the intake system.

But if the RGV150 uses the same sort of oil injection as older 'zukis, the oil isn't injected into the intake , it's piped direct to the bearings. Fuel settings are unrelated to oil flow, latter's based on throttle only. So I don't think that rich mixture on that sort of setup will produce smoke, except from the results of being so rich that it's misfiring (and burning the oil from the "missed" cycles once it does fire). Doesn't on mine, anyway. Admittedly, it's ancient.

[F5 Dave]

You’re talking 1970’s suzuki’s there. Oil on the 150 is feed into fuel flow. If a bike is 'fuel mixture rich' then you get incomplete combustion & lots of oil out the back of the pipe (some is inevitable) but that oil is unburnt hence not turned into smoke.

Hammering a 150 will produce quite high speeds, either way -to what effect? What are you “clearing out?”

The crank case will clear most anything in a few revs, so that only leaves the plug & the pipe. Far better to burn the pipe out with a gas torch or similar.

By the way if I haven't mentioned it earlier it is best with these bikes to check & clean the powervalve every so often. If they seize the valve & or wear/damage the rivet holding them together then it will drop into the piston. uess if it has been rebuilt recently this will have been done, ear mark it for a years time.

[pyrocam]

As someone said, hammer the engine- need not be illegal speeds. Just make the engine work for its living for a while. Hard as possible, not fast. Hammering a 50ccc would be unlikely to break any speed limit. (more fun doing ti at speed, though but , )

IIRC, and IMHO, running rich on a stroker will produce smoke *IF* it's using premix or the type of injection system that injects the oil into the intake system.

But if the RGV150 uses the same sort of oil injection as older 'zukis, the oil isn't injected into the intake , it's piped direct to the bearings. Fuel settings are unrelated to oil flow, latter's based on throttle only. So I don't think that rich mixture on that sort of setup will produce smoke, except from the results of being so rich that it's misfiring (and burning the oil from the "missed" cycles once it does fire). Doesn't on mine, anyway. Admittedly, it's ancient.

Oh so confusing.

I think I understand. I also think that might explain something. a random 'donk' noise inbetween the normal engine 'dindindindindindin' (excuse my jargon if its a bit technical for ya )

would that be a misfire? wihch would make the oil burn. which would indicate a bad spark plug maybe? the plug was replaced at colemans. maybe its semi faulty?

[F5 Dave]

. . . If a bike is 'fuel mixture rich' then you get incomplete combustion & lots of oil out the back of the pipe (some is inevitable) but that oil is unburnt hence not turned into smoke. . .

The above is a red herring. If it is misfiring you will feeling it sputtering.

Bikes make many strange sounds.

[Ixion]

well as you may be aware its a bit hot out, so I went for a spin. gave it some good rpm's etc. by the time I got home it was only spilling white smoke when I got 1/2way into the red. well all that I could notice anyway.

So do you have a problem anymore ? If it's only noticeably smoking when you're in the red, I'd incline to say that all is well ?

[Ixion]

You’re talking 1970’s suzuki’s there. Oil on the 150 is feed into fuel flow. If a bike is 'fuel mixture rich' then you get incomplete combustion & lots of oil out the back of the pipe (some is inevitable) but that oil is unburnt hence not turned into smoke.

Yep, ancient. I stand corrected. And direct injection can produce smoke on a rich mixture. Lots of fuel means lots of oil, more than the airflow can handle after crankcase compression. So the excess sits around in the crankcases for a bit, then gets picked up when the throttle's opened..

But I'm not sure if OP has a problem any more. (original prob I still think was related to running out of oil).

[pyrocam]

So do you have a problem anymore ? If it's only noticeably smoking when you're in the red, I'd incline to say that all is well ?

yeah I would tend to agree with you there. still needs a bit more testing. I would bet that the 5 hours since I rode it last means that when I start it now (or when its cold) its smoky as hell.

hmm. maybe the hotter the engine the less oil is burnt at the lower temperatures therfore aiding in combustion and not crapping out the back? does that make sense?
Im not sure why a good gunning of the engine seems to make it work better. any ideas?


re the spluttering. its very minimal. If anyone mechanical is interested I can ride it near you

[Ixion]

yeah I would tend to agree with you there. still needs a bit more testing. I would bet that the 5 hours since I rode it last means that when I start it now (or when its cold) its smoky as hell.

Ah. Are you saying that it smokes after you start it up, then clears when you give it a good burn?

I have seen that problem in the past. Though I'm not sure if it would be applicable to your bike, since the oil injection system is different.

But, on early Yamaha's (and Suzukis, but Yammys seemed to be worse) sometimes the little valve in the oil pump would not seat properly. That meant that when the bike was sitting oil could drain by gravity from the oil tank into the crankcase and collect there (just slowly oozing and dripping through ) . When you start it of course there will be much smoke. My 180 Yamaha used to do that. If it had sat over a few days I used to pull the crankcase drain plugs before starting it, otherwise the fire brigade would follow me around because of all the smoke (PT)

Happens (used to ) on four strokes also, those with dry sumps. Most Triumph (Meridian) owners will know the problem. The non return ball valves in the oil pump would leak slightly causing excess oil in the cases. The four stroke has a scavenge pump to clear it, but on a two stroke it just has to burn away.

Reiterating, not saying this is the case with your problem, or that it is even possible with the engine you have, but might be worth getting checked out. If it is the problem it's cheap and simple to fix.

[pyrocam]

Ah. Are you saying that it smokes after you start it up, then clears when you give it a good burn?

I have seen that problem in the past. Though I'm not sure if it would be applicable to your bike, since the oil injection system is different.

But, on early Yamaha's (and Suzukis, but Yammys seemed to be worse) sometimes the little valve in the oil pump would not seat properly. That meant that when the bike was sitting oil could drain by gravity from the oil tank into the crankcase and collect there (just slowly oozing and dripping through ) . When you start it of course there will be much smoke. My 180 Yamaha used to do that. If it had sat over a few days I used to pull the crankcase drain plugs before starting it, otherwise the fire brigade would follow me around because of all the smoke (PT)

Happens (used to ) on four strokes also, those with dry sumps. Most Triumph (Meridian) owners will know the problem. The non return ball valves in the oil pump would leak slightly causing excess oil in the cases. The four stroke has a scavenge pump to clear it, but on a two stroke it just has to burn away.

Reiterating, not saying this is the case with your problem, or that it is even possible with the engine you have, but might be worth getting checked out. If it is the problem it's cheap and simple to fix.

hey I think you might be onto it there. that sounds exactly right. after burning it up at lunch it was much better going home. even felt more powerfull. If I were to leave it the way it is and just give it a good work out when it starts smoking again will I do much permanent damage you think or will it be fine burning it off.

oh, and curiously. on a 150cc, if im going 100k's in the highest gear, what kind of RPM's would be expected. they seem quite high when I do it and the smoke is 'really' bad when I do so.

[k14]

Just a quick thing you said about oil. Definately run the best you can get, motul or shell advance etc. They are worth it and will mean that the engine lasts alot longer and could save alot of pain, especially if you get a engine sieze and bin it. You don't want that happening.

[pyrocam]

thanks again for your help guys!

If it helps at all I recorded my bike.
1. on the right hand side
2. on the exhaust
3. on the left hand side

they arent the best quality but you can definatly hear the intermitancies

http://www.pyrocam.com/bike/v001.wav
http://www.pyrocam.com/bike/v002.wav
http://www.pyrocam.com/bike/v003.wav

cheers

[MSTRS:Me]

thanks again for your help guys!

If it helps at all I recorded my bike.
1. on the right hand side
2. on the exhaust
3. on the left hand side

they arent the best quality but you can definatly hear the intermitancies

http://www.pyrocam.com/bike/v001.wav
http://www.pyrocam.com/bike/v002.wav
http://www.pyrocam.com/bike/v003.wav

cheers

Sounds like a normal 2smoker to me

[pyrocam]

Sounds like a normal 2smoker to me

Oh okies then. thats cool.

I think I might just leave it. just hune it when its smokey.