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  1. #1

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    95 sl750 fuel delivery problem

    center piston with a nice hole in middle. Replaced piston & overhauled carbs. new needle seats & diaphrms etc. cranked 4 ever 2 get fuel 2 carbs & then ran terrible. replaced fuel pump (3 outlet) & varified pop off @ spec. repaired broken fuel line connection on fuel sending unit & still wont run proper. bypassed fuel selector, checked all fuel lines, fuel flow back 2 tank & restrictor is in line. Pulse lin good & clear. Any ideas? engine ran great before piston went. almost seems like wear pulse 2 fuel pump. takes lots of cranking 2 get fuel 2 carbs.


  2. #2
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Check the pulse port nipple in the case for obstruction? They have been known to get clogged on occasion.
    If clear, check fuel pressure with a gauge between carb and restrictor. Should be 1-2 psi at idle, and 4-6 at wot.

  3. #3

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    I had the same problem and found a missing petal on the center cylinder reed valve.

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Where did you mount the triple outlet fuel pump?

    How long is your pulse hose?

    It helps to prime the carbs with a little premix for a quick fire up. Especially good to do after adding new fuel lines or fuel pump. Prevents unnecessary wear on the starter.

  5. #5

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    Quote Originally Posted by starflight View Post
    Check the pulse port nipple in the case for obstruction? They have been known to get clogged on occasion.
    If clear, check fuel pressure with a gauge between carb and restrictor. Should be 1-2 psi at idle, and 4-6 at wot.
    What type of gauge can be used to check fuel pressure?

  6. #6

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    Quote Originally Posted by starflight View Post
    Check the pulse port nipple in the case for obstruction? They have been known to get clogged on occasion.
    If clear, check fuel pressure with a gauge between carb and restrictor. Should be 1-2 psi at idle, and 4-6 at wot.
    What could possibly cause an obstruction? The center piston blew so I would not expect any aluminum in the pulse nipple as it is on the PTO cyliner base. It is definately acting like it has a weak pulse altough it was working great before the piston blew. I have changed the fuel pump and pulse line (actually swapped with another 750 that is working fine). When you pull the choke on it kills the motor dead which usually means a rich condition although it takes 5 min of cranking to get fuel into the carbs.

  7. #7
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Oil sludge/crud, carbon can clog it.
    A gauge like this will work... http://cgi.ebay.com/ebaymotors/FUEL-...=p4506.c0.m245

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by xlint89 View Post
    Where did you mount the triple outlet fuel pump?

    How long is your pulse hose?

    It helps to prime the carbs with a little premix for a quick fire up. Especially good to do after adding new fuel lines or fuel pump. Prevents unnecessary wear on the starter.
    ^^^^^^^^

  9. #9

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    Quote Originally Posted by xlint89 View Post
    Where did you mount the triple outlet fuel pump?

    How long is your pulse hose?

    It helps to prime the carbs with a little premix for a quick fire up. Especially good to do after adding new fuel lines or fuel pump. Prevents unnecessary wear on the starter.
    The pulse line is about 16" long. I have already replaced it and no difference. I swapped a fuel pump and pulse line off my other SL650 which was working fine. No go when installed on SL750. Carb and fuel lines are all good to go. Restrictor and return line all fine. Everything worked great until the center piston failed with a hole in the center. New piston and 120 psi compression.

  10. #10
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    The pulse line should be 12" or less. The shorter the better.

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