SuzukiSavage.com - jetting help

Mortation

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jetting help
04/14/09 at 07:02:51

My bike was over jetted with a 155 main, a 55 pilot, stock air box, and three washers in place of the white spacer.

I changed to 152.5 main and a 52.5 pilot. Sounds great, runs great at idle, and smooth throttle control.

However when riding the bike if I roll hard on the throttle I get sputtering and hesitation or if I let the RPMS get to high same deal. I did not change the washer spacing, its still 3 washers.

Thoughts?

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1988 LS650 - Candy Apple Red w/ Ghost Flames, Harley muffler, S40 seat, white spacer Mod, #55 pilot, #155 main.

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Mortation Full Member Offline Posts: 205	Re: jetting help Reply #1 - 04/14/09 at 07:08:00 Maybe I should have stayed with the 155 main?
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28905 L.A. California Gender:	Re: jetting help Reply #2 - 04/14/09 at 07:20:38 try 2 washers
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Mortation Full Member Offline Posts: 205	Re: jetting help Reply #3 - 04/14/09 at 07:23:04 verslagen1 wrote on 04/14/09 at 07:20:38: try 2 washers I can do that. Think I can get to it without pulling the carb again? Such a PITA!
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prechermike Serious Thumper Alliance Member Offline Kalashna Kitty, from Skat Posts: 1190 Ponzer, NC Gender:	Re: jetting help Reply #4 - 04/14/09 at 07:38:22 You can defientely do that without pullig the carb, but you do have to pull the tank. That is what I did when I did the spacer thing.
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Re: jetting help
Reply #5 - 04/14/09 at 07:47:17

prechermike wrote on 04/14/09 at 07:38:22:

You can defientely do that without pullig the carb, but you do have to pull the tank. That is what I did when I did the spacer thing.

Tank I can cope with the carb is a real PITA. Thanks. Its rediculas to get the carb off I have to remove the Seat, Tank, Side Covers, Battery, Battery box. These things might not be "complicated" but everything sure is CRAMPED.

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1988 LS650 - Candy Apple Red w/ Ghost Flames, Harley muffler, S40 seat, white spacer Mod, #55 pilot, #155 main.

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bill67 Serious Thumper Offline old tired Posts: 8517 genoa city wisconsin Gender:	Re: jetting help Reply #6 - 04/14/09 at 08:55:44 When you go full throttle your on the high speed jet I would try going back up on it first leave the low like you have it now
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Re: jetting help
Reply #7 - 04/14/09 at 08:57:33

bill67 wrote on 04/14/09 at 08:55:44:

When you go full throttle your on the high speed jet I would try going back up on it first leave the low like you have it now

Yea thats what I was thinking, back to the 155 main. I am going to try and go 2 washers as recommended since I dont have to pull the carb for that. If that doesnt work I will go back to the 155.

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1988 LS650 - Candy Apple Red w/ Ghost Flames, Harley muffler, S40 seat, white spacer Mod, #55 pilot, #155 main.

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matt_savage

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Re: jetting help
Reply #8 - 04/14/09 at 10:48:18

Report back to what you find, cuz I'm sorta in the same boat. I just re-jetted mine to 52.5 pilot w/ bleed holes, 152.5 main and 2 of lancer's washer's on the needle jet. I haven't been able to run/fine tune mine yet due to other mods, but would love to hear what you find out. By the way what muffler are you running mort? I have a 1200 sportster muff I'm running that has a 1/2" hole drilled in the baffle to make it louder and more free flowing. I'm thinking I may need the 155 main jet too since I have the pod filter and the free(er) flowing exhaust.

-matt

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Re: jetting help
Reply #9 - 04/14/09 at 10:53:13

matt_savage wrote on 04/14/09 at 10:48:18:

Report back to what you find, cuz I'm sorta in the same boat. I just re-jetted mine to 52.5 pilot w/ bleed holes, 152.5 main and 2 of lancer's washer's on the needle jet. I haven't been able to run/fine tune mine yet due to other mods, but would love to hear what you find out. By the way what muffler are you running mort? I have a 1200 sportster muff I'm running that has a 1/2" hole drilled in the baffle to make it louder and more free flowing. I'm thinking I may need the 155 main jet too since I have the pod filter and the free(er) flowing exhaust.

-matt

I have a stock air box and Harley muffler with no baffle. Mixture screw is out 1.5. Yours do the same thing?

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1988 LS650 - Candy Apple Red w/ Ghost Flames, Harley muffler, S40 seat, white spacer Mod, #55 pilot, #155 main.

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LANCER

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Re: jetting help
Reply #10 - 04/14/09 at 10:59:21

Mortation wrote on 04/14/09 at 07:02:51:

My bike was over jetted with a 155 main, a 55 pilot, stock air box, and three washers in place of the white spacer.

I changed to 152.5 main and a 52.5 pilot. Sounds great, runs great at idle, and smooth throttle control.

However when riding the bike if I roll hard on the throttle I get sputtering and hesitation or if I let the RPMS get to high same deal. I did not change the washer spacing, its still 3 washers.

Thoughts?

If by that you mean you are going wide open throttle then it sounds too rich in the high range, which would mean going down to a #150 main jet.

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Mortation

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Re: jetting help
Reply #11 - 04/14/09 at 11:02:00

LANCER wrote on 04/14/09 at 10:59:21:

Mortation wrote on 04/14/09 at 07:02:51:

My bike was over jetted with a 155 main, a 55 pilot, stock air box, and three washers in place of the white spacer.

I changed to 152.5 main and a 52.5 pilot. Sounds great, runs great at idle, and smooth throttle control.

However when riding the bike if I roll hard on the throttle I get sputtering and hesitation or if I let the RPMS get to high same deal. I did not change the washer spacing, its still 3 washers.

Thoughts?

If by that you mean you are going wide open throttle then it sounds too rich in the high range, which would mean going down to a #150 main jet.

Yea, if I roll on the throttle hard like to accelerate quickly the bike jerks, sputters, hesitates. Hmm, didnt do it with the 155/55 setup. Isnt 150 stock?

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1988 LS650 - Candy Apple Red w/ Ghost Flames, Harley muffler, S40 seat, white spacer Mod, #55 pilot, #155 main.

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matt_savage Full Member Offline I love YaBB 1G - SP1! Posts: 177	Re: jetting help Reply #12 - 04/14/09 at 11:04:42 I havent had a chance to tweak/fine tune my setup with the mix screw since my bike is still under the knife, but before when it was running it was about 2 turns out and still had a small backfire on shutdown.
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Mortation

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Re: jetting help
Reply #13 - 04/14/09 at 11:06:12

matt_savage wrote on 04/14/09 at 11:04:42:

I havent had a chance to tweak/fine tune my setup with the mix screw since my bike is still under the knife, but before when it was running it was about 2 turns out and still had a small backfire on shutdown.

Yea I don't think thats gonna go away ever. My biggest gripe was all the bike firing on decel. Its embarrassing Tongue

But that pretty much went away with the jets.

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1988 LS650 - Candy Apple Red w/ Ghost Flames, Harley muffler, S40 seat, white spacer Mod, #55 pilot, #155 main.

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matt_savage Full Member Offline I love YaBB 1G - SP1! Posts: 177	Re: jetting help Reply #14 - 04/14/09 at 11:09:26 back firing on decel most times has to do with exhaust leaks. I had a little popping on decel and when I checked my exhaust connections the header bolts were a little loos as was the connection with the header and muffler. I tightenend both of these up and popping on decel went away.
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