crv

My Feedback: (1)

The question I'm about ask ask I know will bring many answers and suggestions. Yet I need as clear an answer as possible. (ty)... I'm trying out a Zenoah G230rc with a 25.4cc cylinder kit. As the Zenoah manual states, the correct oil/gas mixtre should be "25.1". Made up a batch of 25.1 poured into a clean tank, set carb needles to: L:1 1/4, and H:1 1/2, give or take a hair. It took a fair amount of pulls on the starter, but it sarted right up. Acceleration seems to be good, it idles good, (by the way what rpm should the idle be??). Now here ly's the issue. The engine sounds,rev's,and run's good, but the damn thing smokes quite some at idle, and if you give it gas it won't let you see what's around you. Needles to say that if you put a sheet of newspaper under the exhaut tip, within a 2 min period or so you'll have quit a bit of a puddle of black oil/gas mixture on the paper.

The needle settings seem right, The exhaust system is new. If you pull out the plug, it's black as if the needles where set too rich! Yet they are set to factory settings. Could it be that the oil mixture itself is a bit too concentrated?? Have also tried different oil's. To the same end. Supposively, 128oz=1gal. which if divided into 25=25.1.
could that amount be lowered a tad? I must mention though that the engine cyl. head/pison upgrade was just recently done. Maybe 1 tank of gas has gone tru it. Let me ask this too: to 33.8oz, which is a litre, also to a gal. (for comparison to what I have mixed), exactly how much oil do I mix? I have a mixing cup,syringe. I figure that If I could lower the mixtre a bit that would cure the proble. Cause I don't think that closing the "L" or "H" needle's is going to solve this situation. no? Or could it be the answer?? Cause I've closed "L" some, a little of course and the acceleration raises at idle. ty for your time and expertise.

8000ft

25:1 is a thick mix so it will smoke and foul plugs. The engine manufacturer is covering their butt by telling you that it must be run at that mix. I run mine 40:1 and still have visable smoke and puddle formation at the end of the pipe, so even at this mix I'm still getting enough lube in the engine.ounces of oil per gallon of fuel
20:1---- 6.40oz oil
25:1---- 5.12 oz
30:1---- 4.26oz
32:1---- 4.00oz
35:1---- 3.66oz
37:1---- 3.46oz
40:1---- 3.20oz
42:1---- 3.04oz
45:1---- 2.84oz
47:1---- 2.72oz
50:1---- 2.56oz
52:1---- 2.46oz
55:1---- 2.33oz
57:1---- 2.25oz
60:1---- 2.13oz
62:1---- 2.06oz
65:1---- 1.97oz
67:1---- 1.91oz
70:1---- 1.83oz
72:1---- 1.78oz
75:1---- 1.71oz
77:1---- 1.66oz
80:1---- 1.60oz
82:1---- 1.56oz
85:1---- 1.51oz
87:1---- 1.47oz
90:1---- 1.42oz
92:1---- 1.39oz
95:1---- 1.35oz
97:1---- 1.32oz
100:1---- 1.28oz

messing with your needles won't help the excessive oil problem, only thinning the oil/gas mix will do that.

carpy100

yep, i run mine at 40-1 ish!!

3dd

My Feedback: (6)

25:1 is way too rich for any engine to not be messy 32:1 is the most i ever go and then only for one or two tanks and then go to 40:1

crv

My Feedback: (1)

I'll try the 40:1 mixture. I has to solve the problem, I believe, for all else has been tried. Thanks for the feedback.. I'll post the outcome after the new mix is brewed, and consumed by the engine.thanks!!!!!!!!

crv

My Feedback: (1)

I'll try the 40:1 mixture. I has to solve the problem, I believe, for all else has been tried. Thanks for the feedback.. You'd think that following the manufactures suggested mix would be problem free...oh well. I'll post the outcome after the new mix is brewed, and consumed by the engine. One question does come to mind though?? Like I mention in the original post there is a new 25.4cc kit in this engine. Will the 40:1 mix damage anthing? Of course it will be broken in easy, so that the new parts have a chance to settle in properly. But I must ask...thanks!!!!!!!!

8000ft

I'm sorry I missed the part about it being a new engine. 40:1 isNOT good for a new engine. I would run 1 full gallon of 25:1 through the engine then it's ok to switch over to 40:1.

crv

My Feedback: (1)

Well I brewed-up a 40:1 mix and filled up the tank. Checked all needle settings,lines,filter,carb bolts. I fired up, after a 1/2 doz. or sp pulls. OK, smoking will on idle gone!! The exhaust oil trail, (puddle) reduced about 80% or so. Spark plug clean. Good power, and sounds good when revved-up... Of course the engine is rebuilt, so I'm not gunnig it, or abusing the same. And now one can breath around it, w/o choking, and tearing!!!!

Question though. "8000ft", mentioned that one should run at least a gal. at 25.1, before changing the mix down to 25:1. I have run "3" tanks thru it at a 25:1 mix. The tank right now has a 40:1 mix in it. Should I raise it to 25:1 for the fourth tank for break-in, or can I leave it at 40:1, and just run it easy. Buy the way I added a bit of "Marvel Mystery Oil" to the tank, as I do to my regular vehiles, (the real ones). For a bit of extra protection. Opinions please...... OOOhhh..thanks 8000. for your feed-back..greatly appreciated!

strong_material

My Feedback: (1)

I've been running 64:1 with AMSOIL and it runs great. Never had a problem with engines and no visible smoke too.

chowderhead72

My Feedback: (4)

Your choice of oil also plays a big part in the amount of smoke. The blue zenoah oil is the worst of all the oils that I have seen used. I run amsoil saber 100 synthetic at 36:1 and have never had a problem and the motor I just switched out was at least 5 gallons old with no problems; I just wanted a little more performance. If you are going to run at 40:1 you had better be using very good oil.(full race full synthetic)

kinggeordie

castrol 32:1 all the way for me

carpy100

you only need to break in a couple of tanks at most, then give it the beans.
you can do more harn than good running in for too long. imagine a freshly honed bore, a series of sharp peaks and troughs-

^v^v^v^v^v.

the idea is to knock the tops of the peaks off, so that you are left with just the troughs, with the peaks flattend off.this allows the lubricant(oil in the mix) to sit in the troughs and provide lubricant for the piston ring/rings.

if however you go too easy and take too long using too little throttle, the 'peaks' get rounded over and fill the troughs leaving nowhere for the oil to sit, providing insufficient lubrication throughout the length of the bore. this process is sometimes known as 'glazing' of the bore and causes overheating and seizures.
i know that it is advized to snap the throttle open and shut rather than gently accelerating and feathering the throttle.this aids the process. with 4 stroke engines you use a fairly low grade mineral oil to also aid this process for a couple of hundred miles then change to a synthetic if wished.
the rings and bore are the only things that need bedding in with each other, bearings do not need bedding in as there is no contact between any machined parts.

i know that this can be a very contravercial subject, and i have very crudely tried to explain the processes involved.

hope this helps,
paul.

flyingigo

I USE 50-1 MIX THATS THE WAY TO GO,AFTER 2 GALLONS OF FUEL I TOOK APART ENGINE AND PISTON AND SLEEVE WAS GREAT

bigger the better

Just got done running at the bike track ran great. I am in the middle of running my gallon of 25:1 out when today I realized that I may not need to change. Ran great top end and low end with no bogging. I am running Amsoil Saber Pro (New Smokeless Formula) and I see minor smoke at idle and really none when WOT. I do not see the puddle of oil that you are but it does come out some. Just FYI that the oil is definitely the smoking problem as I'm not experiencing that problem at 25:1 also - Try a different type of oil before switching ratio. JMO