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post #1 of 17 (permalink) Old 06-07-2013, 07:09 PM Thread Starter
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Help Tuning Prowler

I got my 2006 Prowler back together today.

It's running really hot (the header pipe is not glowing) and it is idling really high and the adjustment screw doesn't have any effect.

Here are the details on the engine:

1. I used the Speedwerx 700 cc overbore kit and new piston on it.
2. I have the stock exhaust and a Benz silent rider after the muffler
3. I have the stock pilot jet and a 155 main jet that I installed
4. I have a cold air intake that I made:

And recommendations on the jetting? Do I need to step up both the main jet and pilot jet? Where can you get pilot jets?

2006 Prowler 650 H1 XT
2003 Expedition FX4
1978 FJ40
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post #2 of 17 (permalink) Old 06-07-2013, 08:44 PM Thread Starter
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BTW - that air intake makes it LOUD

2006 Prowler 650 H1 XT
2003 Expedition FX4
1978 FJ40
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post #3 of 17 (permalink) Old 06-08-2013, 08:19 AM
de3
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Quote:
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BTW - that air intake makes it LOUD
Austin,you need to go up on your pilot jet,it's running too lean that's why your idle wont control anything.your pilot jets works from idle to off idle,and then your main jet come in.should be able to get jets at your local dealership.I have the speedwerx intake like that ,I had to take it off to loud,

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post #4 of 17 (permalink) Old 06-08-2013, 08:34 AM Thread Starter
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Do you think the main jet is about right at 155?

What size pilot jets should I try?

2006 Prowler 650 H1 XT
2003 Expedition FX4
1978 FJ40
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post #5 of 17 (permalink) Old 06-08-2013, 08:49 AM
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DE3 knows carburators! I'd follow his recommendations on jetting. Now if it was a Holley double pumper...............................RD

2009 700EFI XTX, , AC Winch, 2010 Dust Shield EPI Sport Utility Clutch Kit , Street Legal, Cage chopped 2 ", Aluminum Diamond Plate Trim, Relocated Factory Bladders with covers, 5 Pt. Harness installed, Bed Tiedown System, Scat Pro-Car Seats, Secondary Battery installed, Oil Pressure, Oil/CVT Temperature, Volt Meter & Water Temp Gauges installed with Dash Plate, Bighorns, ITP Black 212 Wheels. Tonneau cover. 750 Big Bore Kit, Web Cam, and Rocker Arms.

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post #6 of 17 (permalink) Old 06-08-2013, 09:39 AM
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Quote:
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Do you think the main jet is about right at 155?

What size pilot jets should I try?
do you have the stock carb or the mikuni.you have to make all you adjustments with the motor up to temp,if your motor will take all the gas at full throtle the main is not to big,and and if it dosen't back fire when letting off gas after running it hard your main should be fine.when I first started tuning mine my pilot was to small and it idled to fast,and the idle adjustment wouldn't even idle it down.you also have air/fuel adjustment screw it should be around 1 1/2 to 2 turns out.like I said all major adjustments needs to be made with motor at operating temp,a cold motor will handle a big jet, once it warms up it wont take the fuel right it will be sluggish.

2015 A/C Sport,With a few add ons..........
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post #7 of 17 (permalink) Old 06-08-2013, 04:00 PM Thread Starter
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I have the the factory carb. No problems at full throttle and it doesn't backfire when letting off. It only backfires (just a slight pop) when i turn off the engine.

I'm not familiar with the air/fuel adjustment screw? Is that what is referred to as the "pilot screw" in the service manual?

2006 Prowler 650 H1 XT
2003 Expedition FX4
1978 FJ40

Last edited by Austin Hunter; 06-08-2013 at 04:08 PM.
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post #8 of 17 (permalink) Old 06-08-2013, 07:40 PM
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Quote:
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I have the the factory carb. No problems at full throttle and it doesn't backfire when letting off. It only backfires (just a slight pop) when i turn off the engine.

I'm not familiar with the air/fuel adjustment screw? Is that what is referred to as the "pilot screw" in the service manual?
Austin it could very well be your electric choke sticking,stock jetting on your carb is 132 main and 40 on your pilot jet,with the big bore kit I would stay with the 155,when I had the stock carb I run a 152 and that was stock bore,with that high flow intake you want to jump up on your pilot jet because you are sucking a lot of air now you can get your cvk jets at you A/C shop or from speedwerx's your air fuel screw is on the back of carb towards the cylinder turning the screw counter clock wise richens it clock wise leans it out.If the choke is not sticking you need a bigger pilot jet,I would start at a 42 and go up to a 55.in between that range you will find the sweet spot.

2015 A/C Sport,With a few add ons..........
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post #9 of 17 (permalink) Old 06-08-2013, 07:57 PM
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Austin,If your head pipe is not glowing your not to lean,you need to take your choke out and clean it,if it is sticking you can not control the idle,I had the same thing happen.

2015 A/C Sport,With a few add ons..........
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post #10 of 17 (permalink) Old 06-08-2013, 08:00 PM
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How do you know the motor is running hot,do you have a temp gauge.

2015 A/C Sport,With a few add ons..........
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