What size mains are these?

YAMAHIZAL700

YAMAHIZAL700

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Feb 12, 2005
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durham, ME
I a bit confused about what I have going on here, when I cleaned my carbs I pulled the mains to see what they were. They def. are not stock and I was wondering if they are even correct since they were pretty hard to read and I have pretty good eye sight or at least I thought I did. My clutch side read 153.8 same on middle and then 155 on the last one. Im learning as I go but am waiting for cylinder and piston so that I can rebuild but some of the guys on here have noticed from my pics that my motor has been mismatched with different cylinders. The other thing I noticed was that my fuel screw was set waaaaayyy more than 1/1/8th turns out. IMO I believe they were like 5-6 turns out. After reading about what my stock set up should be I dont think I had anything at stock specs to make me believe these are different jet sizes so I need to compinsate with more turns out on the fuel?
 
wow you have a mismatch engine everywhere lolllll.... well now try to check if u have stock cylinder or ported one ..... if its stock well put those stock jet in it
 
What is the advantage to having bigger jet sizes? Does it make more power or just use more gas? Has anyone heard of these jet sizes or is something wrong with this picture. I know these are pretty stupid questions for someone who has done this before but I only asking because I dont want to rebuild this engine and have all three clyinders go kaboom. Also, if anyone can chime in on the carborator settings im really nervous about putting them back in since I bottomed out the fuel screws but like I said they seemed to be way too far out. What is a safe setting on the fuel screws? Am I worrying for nothing or do I need to be careful? Looks like Im going to be running two stock 99 cylinders and one stock 2000 cylinder. THe reason the cylinders are mismatch is because the dealer did this on a rebuild 2 years ago.
 
Fuel screws

I would be surprised if fuel screws would even stay in the carbs if they were out 5-6 full turns. Usually you don't want to go more than 2 1/2 or they will loose pressure from the spring that keeps them from loosening and falling out. It seems like the only reason anyone would have fuel screws turned out that far would be to compensate for too lean of a pilot jet. Maybe that has been your problem......what pilots are in there?

Madmatt
 
YAMAHIZAL700 said:
What is the advantage to having bigger jet sizes? Does it make more power or just use more gas? Has anyone heard of these jet sizes or is something wrong with this picture. I know these are pretty stupid questions for someone who has done this before but I only asking because I dont want to rebuild this engine and have all three clyinders go kaboom. Also, if anyone can chime in on the carborator settings im really nervous about putting them back in since I bottomed out the fuel screws but like I said they seemed to be way too far out. What is a safe setting on the fuel screws? Am I worrying for nothing or do I need to be careful? Looks like Im going to be running two stock 99 cylinders and one stock 2000 cylinder. THe reason the cylinders are mismatch is because the dealer did this on a rebuild 2 years ago.
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before you worry about jet sizes, u need to get three matching cylinders for ur 99, mrviper tried to tell you this but you didnt listen, WHEN you get ur three matching 99 cylinders and matching heads, and figure out if they are ported or not,you need to undo what ur dealer done, and forget about using mismatched cylinders and heads, than worry about jetting,which should be something like, 150 pto, 148.8 center and 148.8 mag, three matching cylinders and heads first or else ur wasting ur time and money, fuel screws shouldnt b turned out more than 1 and 3/4 turns
 
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I have to agree with Blueracer on this one. You've got a respected engine builder (Mr. Viper) trying to point you in the right direction and he's not even trying to sell you anything. Find a good 99 cylinder and sell the 2000 to get some money back. Do it right and it will run forever (maybe not, but you get the idea). Do it with mismatched parts and it might run a day, a week, or ????

I have no idea if this is possible or not, but have you entertained the thought of sending all three of the cylinders, heads, etc to a good motor guy and having them cut to the same specs? Like I said I don't have a clue if it would work, but then they would all match and you'd have a place to start with your jetting.

Good luck.
 
blueracer said:
before you worry about jet sizes, u need to get three matching cylinders for ur 99, mrviper tried to tell you this but you didnt listen, WHEN you get ur three matching 99 cylinders, and figure out if they are ported or not,you need to undo what ur dealer done, and forget about using mismatched cylinders, than worry about jetting,which should be something like, 150 pto, 148.8 center and 148.8 mag, three matching cylinders first or else ur wasting ur time and money, fuel screws shouldnt b turned out more than 1 and 3/4 turns
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Thanks for your reply. I know its not the right way but I found a goo 99 head cylinder combo which puts me at 2 99 stock cylinders and 1 2000 cylinder. At this point winter is getting close to the end and I want to get back on the trail. Im in the process of looking for a third 99 cylinder and head to replace the 2000. If I do run the 2000 cylinder it will only be for a short time just to get the sled running again. At this point I trying to learn how the jetting that is in there worked with the cylinders prior to the detonation. Before this cylinder went the sled pulled real hard and I was very happy with it. Why would someone change the jetting anyway. To make up for ported cylinders? Which means now that I have stock the jetting needs to be changed? Right? SOrry for being Ignorant Im just trying to learn. I hope I can find a reasonable third cylinder so everything can go back to stock. Thanks for the info guys.
 
YAMAHIZAL700 said:
Thanks for your reply. I know its not the right way but I found a goo 99 head cylinder combo which puts me at 2 99 stock cylinders and 1 2000 cylinder. At this point winter is getting close to the end and I want to get back on the trail. Im in the process of looking for a third 99 cylinder and head to replace the 2000. If I do run the 2000 cylinder it will only be for a short time just to get the sled running again. At this point I trying to learn how the jetting that is in there worked with the cylinders prior to the detonation. Before this cylinder went the sled pulled real hard and I was very happy with it. Why would someone change the jetting anyway. To make up for ported cylinders? Which means now that I have stock the jetting needs to be changed? Right? SOrry for being Ignorant Im just trying to learn. I hope I can find a reasonable third cylinder so everything can go back to stock. Thanks for the info guys.
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the jet sizes u listed are not stock jet sizes, if i was you, i would ask mrviper700 very nicely(seeing that he has already tried to help you) if he has a 99 cylinder and head,send him your new pistons and cylinders, heads, have him do his magic on it for you, you wont be dissapointed, if you keep trying to run ur sled with mismatched parts you will never get the jetting right and it just wont last, take the extra week it would take to send ur parts out and get it done right.
 
eatch time you ported a cylinder it increase air flow that why you need to put bigger jets to make it run perfect cause more air mean more gaz .....so if u have stock heads and stock cylinder well u can run stock jetting and take a look at those pilot jet to make sure they are stock too....
 
forget about the jetting for now

i still dont see the worry about jetting this thing yet, why it keeps coming up is beyond all understanding, this guy needs to get three matching cylinders and heads,find out if its stock porting or if it has been ported, he still dosnt know this, and until he does know for sure, you can sit here and bang ur head against the wall on ur jetting issues, especially if you have no idea what you are working with in the first place
 
I do agree with you on this but, I never dissagreed with mrviper, I was just wondering why some say go for it and some say no way. I now know the right way of doing it but just needed a starting point go learn from. Also I was on the fence to ditch this sled for an upgrade to 01-or 02 srx with less miles and a easier life. My sled has had a real tough life being raced and beat on not by me but I heard the backround after I bought the sled since Scott(betheviper) almost bought it hisself to rebuild. Long story short since the season is getting shorter I was convinced to fix this one Id be able to slap a head,cylinder and piston in there and away Id go. Now with the help of mrviper and other fine gentlemen on here I am learning a great deal about the motor and other parts work together its just becoming a little more than I expected before I opened her up. If this was a different sled that I was planning on keeping for ever Id have my cylinders on their way for porting but I want to finish the season strong and look to find a newer one off season and have this one ready to go asap. I do want the sled right first because I dont want someone else to have a surprise if they have to ever do anything to the sled. This has helped me understand what I need to do right now as far as stock jetting and stock cylinders. Turn the fuel screws out 1 7/8(almost 2 turns out from bottom) And I should be good to go right?
 
blueracer said:
i still dont see the worry about jetting this thing yet, why it keeps coming up is beyond all understanding, this guy needs to get three matching cylinders and heads,find out if its stock porting or if it has been ported, he still dosnt know this, and until he does know for sure, you can sit here and bang ur head against the wall on ur jetting issues, especially if you have no idea what you are working with in the first place
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Right now I have a 99 stock cylinder and 2000 stock cylinder. I have another 99 cylinder in the mail right now and when it comes I want to put it on, return the jets back to factory and be able to start the sled. As soon as I get the 3rd 99 cylinder I want to be able to slap it right on and be on my way.
 
I think you're missing the point of what everyone is trying to tell you.

Although those 3 cylinders are originally from different year sleds they could all be ported to be the same regardless of year or origin.

Assuming all 3 of your cylynders are ported....If you 'slap' on a stock 99 ported cylynder and reset jetting to stock you will most likely burn down the two remaining ported cylinders.

Sure the stock 99 cylinder may be fine with stock jetting..but the other 2 are most likley ported and require MORE fuel...that means they will NOT work with the stock jetting (not for very long anyway..:)

Get those cylinders checked over to ensure they are stock before you bother with looking at jetting numbers....otherwise you will have to manually inspect your jetting and adjust as necessary using piston wash and plug color...NOT by using stock numbers.
 
first off, ur fuel screws shouldnt b turned out more than 1 1/2 turns if ur running stock everything, if u have throttle hang up than go to 1 3/4 turns out, as far as u using a 2000 cylinder with 2 99 cylinders, good luck getting that jetted right, port specs r different from 99 to 2000,as mrviper told you, it makes a big difference, like kaboom difference,dont be suprised if ur motor dosnt last, ur wasting ur money doing it half azzed, but its ur sled you do it how you feel is correct.
 
I have no intrest in arguing over this, I was just trying to tell you to get all 3 cylinders the same, all 3 heads the same, and then you know what you have. Much easier to guide you on jetting,set up help.
I have come to the conclusion by reading all the post on this that no matter what is said,the sled will just be slapped back together to get it running again and out on the trail. I also remember alot of post as to why the sled wont pull the rpm and the clutching and so forth, but with mix matched parts its not gonna run the way it should either.I also know you got it that way.

I mean no offense to anyone, I am taken the wrong way sometimes and when you can only read print and not see the person thats talking/facial expressions,tone of voice etc. its not hard to do, but I just dont work that way thats why I quit trying to help, its the same as shooting yourself in the foot, or a dog chasing its tail.

I wish you all the luck, I hope I am wrong and it screams for you.
 
blueracer said:
first off, ur fuel screws shouldnt b turned out more than 1 1/2 turns if ur running stock everything, if u have throttle hang up than go to 1 3/4 turns out, as far as u using a 2000 cylinder with 2 99 cylinders, good luck getting that jetted right, port specs r different from 99 to 2000,as mrviper told you, it makes a big difference, like kaboom difference,dont be suprised if ur motor dosnt last, ur wasting ur money doing it half azzed, but its ur sled you do it how you feel is correct.
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Dude I dont know why you get so disturbed with me but I only trying to learn here. If you dont know just ask questions right? As for the other cylinder moneys a bit tight so I have to wait I guess. #$%&*
 
mrviper700 said:
I have no intrest in arguing over this, I was just trying to tell you to get all 3 cylinders the same, all 3 heads the same, and then you know what you have. Much easier to guide you on jetting,set up help.
I have come to the conclusion by reading all the post on this that no matter what is said,the sled will just be slapped back together to get it running again and out on the trail. I also remember alot of post as to why the sled wont pull the rpm and the clutching and so forth, but with mix matched parts its not gonna run the way it should either.I also know you got it that way.

I mean no offense to anyone, I am taken the wrong way sometimes and when you can only read print and not see the person thats talking/facial expressions,tone of voice etc. its not hard to do, but I just dont work that way thats why I quit trying to help, its the same as shooting yourself in the foot, or a dog chasing its tail.

I wish you all the luck, I hope I am wrong and it screams for you.
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Thank you very much for all of your help because with out your guidence I would have never been able to tackle this on my own. I just thought that it would have stock jetting and everything would be easy but life never is. I also had too much trust in the dealer. I figured that they were cabable of fixing it the right way and never thought they would do something like that if it were not right but I respect what you tell me anyday over them and I have never even met you face to face. I apologize that I have been a pain in the a$$ on this one but I was just dissipointed and a little thrown off when I found different parts in there. Ive made up my mind now and will wait to fire the sled untill I have 3 matching STOCK cylinders and heads. I will also be purchasing stock mains and pilots and I'm guessing that the needles will be different or Ill need to check the settings.
 
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