I just recently bought a 1992 lt250r and was hopping to get pointed in the right direction. From what i have researched it has the MIKUNI TM34SS carb based on year and vin. It has a full FMF exhaust and K&N air filter, I feel the carb may need to be re-jetted. The bike does not idle at all, but runs strong, (1/4 -1/3 throttle seems to be on the edge of the power band, when pinned it hits hard initially and pulls steady. When I pulled the plug it seems to be rich from what I can see on the plug, dark in color (old plug NGK B6ES).
I live in SW Florida where the temps are generally 80°F to 95°F and will be used for typical trail riding.
I'm running premium fuel with amsoil dominator 2 stroke oil @ 32:1
I have been around four strokes for the last 20+ years, just want to make sure that the 2-stroke lasts, any and all advice is appreciated.
to the forum.
I may be wrong but others will chime in here soon to correct me and give advice.
I would start with changing that Spark plug, I've been running NGK BR8 and 9s in my bike. Once you have that done it would be beneficial to make sure that you have the Billet thrust washers and RM bearing in the top end, Not really for the jetting issue but its cheap insurance so you will be less likely to tear up your cylinder. While your doing that you can go through this post
http://www.suzukiquadracerhq.com/lt250/87-92-lt250r-engine-reliability-guide/Before you start changing your jetting you want to make sure that everything else on the bike is dialed in, other wise you could be running around in circles for a while. I would also recommend giving the carb a VERY good cleaning, and record the carb settings it currently has.
Dutch Rutter can also tell you all about running pump gas in your bike.
LMAO ^ this guy.
Yes I can. don't do it. What you save on gas is not worth melting your piston down. Stick with the higher octane fuels.
Rutter, I'm just poking at you. I'm glad you were able to overcome that little setback and end up with probably a better setup than what you started out with.
Iroczx3, post up some pictures of your toy and don't hesitate to ask questions. And yes, race gas or even at least AV gas will save you lots of grief.
We do have a lot of fun on here
and there are alot of good people who know what they are talking about, like El Diablo. I usually learn by blowing things up.
I've ran across people who swear by running the older leaded clear type of gas. What I've read online (which could be a load of crap) says that the race gas offers the most protection from detonation like what happened with my bike. true or not I have not heard of anyone having issues while running it. So I'll pay the extra for 5-7 gallons of good gas so that it means I don't have to end a day of riding early.
Just make sure you get everything else dialed in before changing jets, (including your gas
)
Thanks for the quick replies. Dutch_Rutter i will keep those tips for when i rebuild the top end at the end of the year but I am noticing some fluid on the outside of the carb on the very bottom and they had the fatty pipe held up with a zip tie..... can't expect much for what i paid i suppose. Also have what appears to be oil build up at the flange and fatty pipe which i believe is do to the improper hanging of the pipe. When I got the bike they were using castor 927 oil, but i chose to run amsoil seeing in the past with my CR it never gave me any issues.
I got a few things i need to fix since my cousin rushed a few things, re-align the rear axle and do an alignment on the front end. I'm going to order a rebuild kit for the carb next week, and add new fluids so i know for my self that it has been taken care of this weekend. I have been reading a bit through other post on gear box fluid, probably leaning towards the 10w-30 just cause of mostly being used as a trail bike and the constant heat in FL over the ATF type F.
I ran the bike with the stock plug for roughly 20 minutes max, mix of half to full throttle trails and open road. Just looking for some opinions on the plug. I will post pictures of the bike in a few days, need to give it a good wash...
http://i1141.photobucket.com/albums/n597/iroczx3/20160908_194228.jpg
I don't think that there is anything wrong with the Amsoil Dominator, but I don't really agree with the ratio they recommend. There is just not enough oil in the mix when it's at 50:1. But there are a few guys here that run it so I hope they will chime in on what ratio they use.
I'm running it at a 32:1
I know with 2 strokes a little extra oil never hurts
I found a shop that has 110 unleaded fuel, what are the benefits over premium fuel? I was under the impression that you needed a high compression motor to benefit from higher octane.
Just read through this:
http://www.suzukiquadracerhq.com/lt250/piston-died/msg51594/?topicseen#newThat was my experience with running pump gas on the ole two stroker.
Since my 4 strokes are not super built they run fine on 93 pump without any problems so long as I drain them when they are not being used. With that said, my LT also is not super built.
Keep this in mind, when you mix your gas with oil you actually loose octane, that with the detonation protection that the 110 provides and the longer plug life, I believe that it is the better choice. Just my
from experience.
you dont have to run 110. A lot of ppl run 100LL and are fine - it's usually only a couple of $ higher than premium. I used to run 104 in my 500 and it ran really good. Sunoco started shipping the 104 with ethanol and the gas station i bought it from quit carrying it.
Just dont try to run higher than 110. You'll likely not have the compression required. It will just burn too cool.
Thank you all for the advice, sorry for the late response be busy with work and family. I got her some what straightened out, the stator was breaking up in the higher rpm's and once i pulled the cover off it was covered in oil from the crank seal. Now the crank seal on the clutch side went.
I don't think that there is anything wrong with the Amsoil Dominator, but I don't really agree with the ratio they recommend. There is just not enough oil in the mix when it's at 50:1. But there are a few guys here that run it so I hope they will chime in on what ratio they use.
I run Amsoil Interceptor oil at 40:1 without issue so far on my 1992 LT250R thats completely stock.
Have run it at 50:1 for years in my dirtbikes, on everything from a CR125 to my current GasGas EC250.
Oil topics usually run pretty wild in my past experience on other forums, hope this one gets you the info you seek.
I didn't have time go over the bike went i got back in September. I relied on the information that i was told from my cousin who i bought it from. Both crank seals were shot, in the process of fixing the right side. The compression seems good at 155psi, but that seal was killing me. I just kept over thinking the whole thing.
I also switched from the Amsoil Dominator to thier Interceptor oil.
if your crank seals are shot, you'll suck air. Tuning will be next to impossible and the end result will probably be a seizure due to running too lean.
155psi for a lt250 is not very good. If im not mistaken, it should be over 200psi.