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| Running a little lean on stock carb. http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=29387 |
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| Author: | locked-up [ Mon May 21, 2012 9:43 pm ] |
| Post subject: | Running a little lean on stock carb. |
He guys, I run my 36 PRODRIVE at 5000 foot, I put the high elevation jets in when I brought my boat home, it ran great. Since then I have added exhaust and k and n filter now she's running a tad lean. Sea elevation jets are way rich, can any one tell me how to get hold of some that are a tad richer then my high altitude jets. |
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| Author: | deadbird8 [ Tue May 22, 2012 3:54 am ] |
| Post subject: | Re: Running a little lean on stock carb. |
Normally adding exhaust and K&N wouldn't warrant a jet change as they usually run a little fat out of the crate, but I haven't had any experience at high altitude. What sizes are you running now? (#1 and #2 are usually different sizes). Note that Briggs doesn't list the size of the jets in the IPL so it will be trial and error getting some different sizes to try. I don't remember the exact stock sizes in the 36HP but, for example, the stock 35 runs #1- 142 and #2- 148 and these are a little larger than what a 36 runs (if I remember right). You may look at a High Altitude pair from a 35HP (613477-0121-E1) and see what sizes they are - these may be the step up you are looking for but you will have probably have to order them to know what size they are. The 35 HP lists two high altitude sets. Not sure of the exact sizes but these are relative to the 142/148 sea level combo for the 35HP type 0121 (the smaller of the two stock pairs listed for the 35). Part # 843365- High Altitude Left Jet Part # 842098- High Altitude Right Jet You may also be able to swap the larger one in the pair you are running now into the #1 cylinder and putting the smaller one from a stock combo in your #2 cylinder, like I said some trial and error. If you order any of those jets, post the sizes with the part numbers so we can put them all together in a list. I know ordering Part #s 842738 and 842103 will get you a 142 / 148 set but I don't know which number relates to which size. If anyone else knows the part numbers for specific sizes post them up. I know I have seen these sizes in the past 138, 142, 148, 150, 156, 160 but could not tell anyone the specific part numbers for them. |
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| Author: | locked-up [ Tue May 22, 2012 9:14 pm ] |
| Post subject: | Re: Running a little lean on stock carb. |
Currently I have the 134 In the left and 138 right facing the intake. I was hoping for a one or two size jump. This is running 90 octane which also has an octane reduction for this altitude. |
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| Author: | deadbird8 [ Wed May 23, 2012 4:45 am ] |
| Post subject: | Re: Running a little lean on stock carb. |
If you really feel you have to change them try the 138 in the left and get a 142 from a stock 35 and tryt it in the right. As far as the jet sizes go, thats probably the smalles increment. Otherwise have your current jets drilled out. |
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