Hey Folks,
I'll start by saying how fortunate I feel for finding TY. I've only owned Yamaha sleds since my first SS440 when I was a kid.
I'll try not to get too wordy in this post, because if you're like me, you'll lose interest, and I need your help. I have a 96' Mountain lite that I got new when I was in high school, and since at that time I thought everything I owned needed more power, I sent a new, and perfectly good set of cylinders and heads away to PSI for some work. After getting the parts back, and re-assembling, the top end siezed on the first ride. We repaired it, and repeated the siezing routine probably five times over the last 10 years, and to this day the sled only has around 800 miles on it because of this. So this year I decided I was going to go back to stock with it, I bought an old set of stock heads on ebay, and was doing some looking on stock carb settings when I found this site. After a little searching, I found the service bulletin for the carb update, and since I had the engine all torn apart in the garage, I decided to pull the primary nozzle out and see what I had. I did not have the updated "Special" primary, in fact, I had a "PSI Special" primary that not only did not have two bleed holes, but had the one bleed hole soldered shut. If not for finding this website, I undoubtedly would have once again replaced the top end, this time with the stock heads, and once again would have melted it down at half throttle.
So since this time I actually going to fix the problem I've had all these years (where were you guys 10 years ago
) I am curious what jetting you are running. I'm not sure if anybody is even riding these dinosaurs anymore, but I cant afford a new one, and would love for this one to just run again. I live at 7000ft in CO, and do most of my riding betweed 8,000' and 10,000'. The engine is ported and polished, the heads are milled, but I'm switching back to stock heads thanks to some posts I read here. The main jet is a 135, I'm not sure about the others, I only pulled that one and the nozzles.
Once again, sorry about the length of the post, but I appreciate your help.
Thanks in advance,
Colby
I'll start by saying how fortunate I feel for finding TY. I've only owned Yamaha sleds since my first SS440 when I was a kid.
I'll try not to get too wordy in this post, because if you're like me, you'll lose interest, and I need your help. I have a 96' Mountain lite that I got new when I was in high school, and since at that time I thought everything I owned needed more power, I sent a new, and perfectly good set of cylinders and heads away to PSI for some work. After getting the parts back, and re-assembling, the top end siezed on the first ride. We repaired it, and repeated the siezing routine probably five times over the last 10 years, and to this day the sled only has around 800 miles on it because of this. So this year I decided I was going to go back to stock with it, I bought an old set of stock heads on ebay, and was doing some looking on stock carb settings when I found this site. After a little searching, I found the service bulletin for the carb update, and since I had the engine all torn apart in the garage, I decided to pull the primary nozzle out and see what I had. I did not have the updated "Special" primary, in fact, I had a "PSI Special" primary that not only did not have two bleed holes, but had the one bleed hole soldered shut. If not for finding this website, I undoubtedly would have once again replaced the top end, this time with the stock heads, and once again would have melted it down at half throttle.
So since this time I actually going to fix the problem I've had all these years (where were you guys 10 years ago
) I am curious what jetting you are running. I'm not sure if anybody is even riding these dinosaurs anymore, but I cant afford a new one, and would love for this one to just run again. I live at 7000ft in CO, and do most of my riding betweed 8,000' and 10,000'. The engine is ported and polished, the heads are milled, but I'm switching back to stock heads thanks to some posts I read here. The main jet is a 135, I'm not sure about the others, I only pulled that one and the nozzles.Once again, sorry about the length of the post, but I appreciate your help.
Thanks in advance,
Colby
phazer95
New member
Are you still running the stock airbox or has it been removed? Removing the air box is a very bad idea as it makes the already lean midrange even worse!130 is the stock main jet for 8-10K ft. So your 135 is a little on the fat side for the main even @ 10K ft.
If you had converted to flatslide carbs when you did your mod motor it would of been fine. The butterfly carbs midrange circut is just not tunable enough to be safe.
Mars
New member
I had a PI single pipe on mine, and I got the updated nozzle, and went up 2 sizes on the mains.
I got 6000 miles out of it, the returned it to stock, gave it to my dad, and it's still going strong @ around 10 000 miles now.
Only thing we did was start pre-mixing...
I got 6000 miles out of it, the returned it to stock, gave it to my dad, and it's still going strong @ around 10 000 miles now.
Only thing we did was start pre-mixing...
Thanks for the replies, I really appreciate it.
Phazer95,
Thankfully the airbox is still original. I'm sure that flatslides would be best, but I'm hoping that the updated primary nozzles will be sufficient. I'm fine with a main jet thats a little fat for now. I have the cylinders being bored, and once I get it back together and running, I can lean it out a touch after break in if it is truely lean.
Mars,
I'm hoping for that kind of reliability again on this sled, but I know that I probably waved bye bye to it with the mods.
Couple more questions.....
I'm getting a ton of oil dripping out of the connection between the Y pipe and the pipe which is really making a mess out of the bellypan. Is my oil pump adjustment way out of wack, or is this just the way it is?
Secondly, have you ever heard of anyone running a deeper lug track on a mountain lite? I think it only has an 1 1/8" track stock, and with the engine work, and lower gearing it seems like it could turn something more substantial? Potentially a boondocking riot?
Just curious.
Thanks again...Colby
Phazer95,
Thankfully the airbox is still original. I'm sure that flatslides would be best, but I'm hoping that the updated primary nozzles will be sufficient. I'm fine with a main jet thats a little fat for now. I have the cylinders being bored, and once I get it back together and running, I can lean it out a touch after break in if it is truely lean.
Mars,
I'm hoping for that kind of reliability again on this sled, but I know that I probably waved bye bye to it with the mods.
Couple more questions.....
I'm getting a ton of oil dripping out of the connection between the Y pipe and the pipe which is really making a mess out of the bellypan. Is my oil pump adjustment way out of wack, or is this just the way it is?
Secondly, have you ever heard of anyone running a deeper lug track on a mountain lite? I think it only has an 1 1/8" track stock, and with the engine work, and lower gearing it seems like it could turn something more substantial? Potentially a boondocking riot?
Just curious.
Thanks again...Colby
smittysnow
New member
I have a 95 long track, piped.
If you go to 7 tooth drivers you can put a 1.5 inch track on there, the reduced gearing with the smaller drivers makes it perfect for the low HP phazer. Super light and fun in the pow. You use a little on the top end but who cares.
If you go to 7 tooth drivers you can put a 1.5 inch track on there, the reduced gearing with the smaller drivers makes it perfect for the low HP phazer. Super light and fun in the pow. You use a little on the top end but who cares.
PZ 1
Member
- Joined
- Mar 12, 2005
- Messages
- 987
I would think that you would be fine with higher compression heads at 7000 feet. But Bender may have figured that elevation in and went to the outside edge for it. Do you know how much the heads were cut or the compression ratio?
Probably would be best to start rich on the jetting and go leaner from there.
Probably would be best to start rich on the jetting and go leaner from there.