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Jetting help
Old 09-27-2006, 09:12 AM   #1
shaggman
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Jetting help

I have just installed a MAC Performance exhaust kit on my 84 VT700. Has anyone out there used this exhaust? If so, did you have to re-jet the carbs?

Rick
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Old 09-27-2006, 09:31 AM   #2
miclash1
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FUCK OFF YOU NOOB!

never heard of a mac performance exhaust kit.

i am sure there will be alot of guys on this site that will be able to help you. just sit back and wait for all the warm responses..... go gettem boys.
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Old 09-28-2006, 04:58 AM   #3
shaggman
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Well, I have pulled my plugs and looked them over. It seems to be burning just right but I am getting alot of popping and cracking out of the front cyclinder. Could this be because that pipe is quite a bit shorter than the back one?
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Old 09-28-2006, 09:51 AM   #4
RustyJake
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popping on decel, adjust your idle circuit. Not sure where the adjustment screw is on the VLX carbs. But you should be able to eliminate that totally by giving it a bit more fuel.
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Old 09-28-2006, 11:51 AM   #5
lang
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Shag - MAC claims you don't have to rejet for their vt700 pipes. But I've got cobras, so I don't have first hand experience with the MACs.

Like rusty jake said, it sounds more like you need to adjust your idle circuit - that's pretty common even with stock pipes.

Here's the location of the mixture screws on my vt800. They should be in pretty much the same place for you. On the 86-88's the airbox is in the way of the left side screw. You won't have that problem. The first pic is the right side, the second is the left. Read this too:
http://www.shadowriders.net/forums/showthread.php?t=577

for me about 3.25 turns out works good. Don't go beyond 3.5 or else the screw can pop out
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Last edited by lang : 09-28-2006 at 11:55 AM.
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Old 09-28-2006, 11:58 AM   #6
lang
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You're a lucky bastard, here's the pages from my shop manual that I scanned for someone else. This should apply for you as well. Oh, both your main jets are probably 112 like mine - so that fact that one pipe is longer and both jets are the same probably does effect it somewhat but probably not enough to really matter.

Last edited by lang : 09-28-2006 at 12:06 PM.
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Old 09-29-2006, 01:15 AM   #7
shaggman
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Man, thanks for all this! I will mess with the idle mixture tomorrow. Now that you mention it it did pop a little with the stock pipes, just not as noticeable with all that crap they put in the stock exhaust.

Does anyone have a link to some instructions on how to lower the front suspension on my 84 vt700?

Thanks again,
Rick
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Old 09-29-2006, 11:31 AM   #8
lang
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I'm like the motherfuckin' scan man! why do I have this crap?

These are instructions from Pete at SOTMC. basically, you just jack up the bike, let the airpressure out of the forks, pull off the caps and shorten the spacer in each tube. You can also use 1" PVC pipe instead of the spacers -but I found its just a few mm too thick to fit in the tube so you have to sand the diameter down just a little. I don't have air pressurized forks, but I understand that the proceedure is the same regardless. I know amazngrace and m@man both have air forks and lowered them if you want to double check.

If it hasn't been changed recently, its also a good time to change out the fork oil. THen its up to you whether to put air back in or not. I know a lot of people who don't bother.


Last edited by lang : 09-29-2006 at 11:33 AM.
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Old 09-29-2006, 09:20 PM   #9
lang
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one more piece of advice: loosen the upper pinch bolts on the forks before unscrewing the fork caps. It'll make taking the caps off much easier.
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Old 10-12-2006, 06:38 AM   #10
shaggman
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Well, I haven't got to the idle adjustments yet but I got the front forks lowered by 1" and with the 1.5" I did in the back it seems really nice to ride and the overall look is much better.
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