80 Liquifire

kenv56 · Post by **kenv56** » Sun Dec 17, 2006 12:24 pm

When I went sledding about a week ago the sled ran great untill it warmed up, about 3-5 miles. Its hard for me to describe what the sound is that it makes, like a buzzing or popping sound, and boggs pretty bad. It only does it when I give it lots of throttle, If I go easy on it and slowly build up speed and not just pin it, it will get better but still only like 3/4 speed mabey a little less. So i took the carbs off took them all apart, and soaked them in some carb cleaner.
It seamed to help but i couldnt really test it till last night, and it didnt seem to do anything.

I pressure tested this engine in the summer.
The spark plugs are a little on the rich side but not to bad
The engine starts up real easy when cold only a couple of pulls
Carbs are very clean running 91 octane gas
I had a different coil on and it still does it.
Also tried different spark plugs.

Im thinking bad stator coils or CDI.
what do you think? Fuel problem, losing spark or weak spark?

Mean Green · Post by **Mean Green** » Mon Dec 18, 2006 1:20 am

I'm not an expert here but it sounds like perhaps your stator plate came loose and your timing is off. This is not likely but somehow the description you have given sounds like either cheap gas, an Invader head replacement (as the invader heads are high compression and Invader heads on a deere engine-stock timing- plus pump gas equals detonation) or 3 year old gas in your tank. Just drinking and thinking here but thats what it sounds like is detonation.

kenv56 · Post by **kenv56** » Mon Dec 18, 2006 3:42 pm

They are not invader heads
The gas was only 1 week old of the best octane offered out hear. made no difference with regular fuel.
Im going to try another CDI, If I understand these adjust timeing right?
Im pretty sure the stator plate is tight i had it off in the summer and lined it with the notch on the case.

Thanks for all the help. Its awesome that people take the time to help out.

Mr. Deere · Post by **Mr. Deere** » Mon Dec 18, 2006 5:41 pm

WOW YOU HAVE HAD NOTHING BUT PROBLEMS WITH THIS SLED HUH. BOB

bob15 · Post by **bob15** » Mon Dec 18, 2006 8:23 pm

Is the air box on it? I would make sure that the jets are still clean not clogged. I find it easier to just replace jets instead of try to clean them. How did you time the motor? Did you line up the stator plate timing line with the crankcase split?

bob

kenv56 · Post by **kenv56** » Mon Dec 18, 2006 8:42 pm

air box is on jets are clean i know that they are cause i seen them. In my other post I said that I took the carbs apart and soaked them, well all the jets looked clean then too. So i dont think that is my problem. I set the timing as you described.

Yes MR. DEERE this sled is getting annoying.

But it is so fun to ride when it runs

bob15 · Post by **bob15** » Mon Dec 18, 2006 9:19 pm

I realize you soaked the carbs, did you spray all the passages out? What are the choke settings? Is the choke plunger seat impressed badly from the seat? Wondering if the choke is still somewhat open which will allow the sled to run good until it is warmed up. Is the white washer under the c-clip, in the middle groove?

bob

Mr. Deere · Post by **Mr. Deere** » Mon Dec 18, 2006 9:23 pm

YA CNT WAIT FOR SNOW TO RUN MY 83 LIQ AROUND BOB

kenv56 · Post by **kenv56** » Mon Dec 18, 2006 9:31 pm

The carbs were soaked and rinsed of with varsol and varsol washed off with HOT water then blown dry through all passages with 120 PSI shop air.
Choke is set to 1/8th free play, The seat impressed could be a possiblilty. Ill try some different ones. Also there is no white washer.

Mr. Deere · Post by **Mr. Deere** » Mon Dec 18, 2006 9:34 pm

on the choke or on the carb slide assembly if on the choke dont sweat it because it dosent matter. On the carb slide assembly you may have a problem. BOB

Mr. Deere · Post by **Mr. Deere** » Mon Dec 18, 2006 9:35 pm

on the choke or on the carb slide assembly if on the choke dont sweat it because it dosent matter. On the carb slide assembly you may have a problem. BOB

bob15 · Post by **bob15** » Mon Dec 18, 2006 10:24 pm

You need the white washers under the needle jet c-clip. That will effect your carb and sled performance. As for the chokes, besides the impression in the rubber, the length from the plunger seat to the threaded brass should be 32mm. If in doubt, a 1/2mm longer is fine. Shorter is bad because it allows more fuel to enter the carb, giving a flooded condition.

bob

Rodimus Prime · Post by **Rodimus Prime** » Mon Dec 18, 2006 11:52 pm

i like this bob person as he saves me replying about the little things on carb..... if it sounds like a loud deep waaaaaaabbbb your midrange is off on carbs could be too rich or tooo lean hard to tell unless you go out and get sled warmed up good and warm tromp throttles open for 1/4 mile and while still holding throttle open kill engine.

this will tell you if your rich or lean at wot. once you get wot set work your way down using same method.

could be anything from wrong clip position to wrong jets in carbs. Takeittolimit has the old serivce manuals with bullitens ask him for updated jets for liquifire.

kenv56 · Post by **kenv56** » Tue Dec 19, 2006 3:03 am

So pretty much every one here thinks it a fuel issue?
Okay I eliminated bad choke with different seats and they are seating - lots of free play.

This is what i found out tonight with a 20 mile ride or so.
Found out that i had a majorly fouled plug after replaceing that plug it ran awesome. This sled was very fast... too fast

. then after about 5 or 6 miles it slowly started getting worse over a period of 1 - 2 miles and got to the point that I have to feather the throttle to bring it upto speed. If I were to pin it, it would bog down to a point where i thought it might stall, so I let off the throttle and feather it and let it clear up and i can slowly bring it back upto a max speed of 30 mph or so. reving at 5500 rpm or so.
When I got back I did what Rodimus Prime said and had it pinned and shut it off. Not pinned for 1/4 mile though. The PTO side plug was dry and brown and the MAG side was a little darker and wet.
The jets that im running are the ones in the service manual that are here
http://www.ryanquick.com/jd/info/
Tonight the temps were about (14F) (-10C)

The noise is not a waaaaaaabbbb bog
Its more like bzddddzzzzdddz
zzzzzz
zzzzzzz
zzzzzzzzzzzzzzzzzzzzzzzzzzzz.

It also when warm starts very well. I can start the engine by spinning the clutch by hand, not safe i know but when the recoil brakes what can ya do? Dont worry its fixed now.

Sorry about the long post but I want to give you guys the most info that I can think of. Thanks for your time

bpmailman · Post by **bpmailman** » Tue Dec 19, 2006 9:32 am

No expert here, but what are the odds on the fuel pump impulse line letting some fuel into the mag side of the case?
mike