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How to get better throttle response..?

Tuning

 
 
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  #1  
Old 12-20-2010
westman995
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Default How to get better throttle response..?

I feel as if my sled could have more throttle response, like it could get the motor up to rpm's faster than it does now. Is there any way to do that without anything major? Carb adjustments, clutch adjustments or something?
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  #2  
Old 12-20-2010
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More monster stickers!

If you are using the Kehin PWK carbs, swap them out for Mikuni TM flatslide carbs(38mm for a 600, 40mm for 700/800). Gut the airbox. Dial in the clutching so you get it shifting exactly where you want it and gear it a little lower. Light weight wrist pins will help a little, so will a good pipe/can combo.

One of the best things I ever did on my RMK was ditch the Kehin carbs for Mikuni's.
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  #3  
Old 12-20-2010
westman995
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I have enough stickers! No monster stickers tho.

Yes stock kehin carbs. Id love to get a pair of those 40mm mikuni carbs, maybe sometime when i can afford to.

Should i take EVERYTHING out of the air box then? Foam too? If i recall i have stock 185 main jets, and i believe 40 pilots?

Its geared low enough i think, stock gearing out of a 98 rmk 600 so its geared lower than a stock 98 rmk 700 would be. Also i have no clue on what to do with the clutching. Again if i recall it has 10-60 weights and an almond/gold? primary spring and stock secondary clutch off a 98 xc 700 hahaha im sure that could be changed to help a bit.

Im not for sure, but i want to say its more so in the motor where it could be getting the rpm's up faster than it is, more than clutching, gearing etc.
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  #4  
Old 12-20-2010
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Quote:
Originally Posted by westman995 View Post
I have enough stickers! No monster stickers tho.

Yes stock kehin carbs. Id love to get a pair of those 40mm mikuni carbs, maybe sometime when i can afford to.

Should i take EVERYTHING out of the air box then? Foam too? If i recall i have stock 185 main jets, and i believe 40 pilots?

Its geared low enough i think, stock gearing out of a 98 rmk 600 so its geared lower than a stock 98 rmk 700 would be. Also i have no clue on what to do with the clutching. Again if i recall it has 10-60 weights and an almond/gold? primary spring and stock secondary clutch off a 98 xc 700 hahaha im sure that could be changed to help a bit.

Im not for sure, but i want to say its more so in the motor where it could be getting the rpm's up faster than it is, more than clutching, gearing etc.

This is a set up I got from a friend for my RMK

Quote:
10-62 weights
Polaris Almond Primary Spring
SLP black brute secondary buttons
Polaris silver/grey sec spring or SLP black/grey
0371G needles (stock from '00 XC 700) in #3 position
185 PTO MJ
190 MAG MJ
V force reeds
Another set up I've seen if you have 220 jugs
Quote:
64g weights
EPI red prim spring
hotseat 38X (50/38) or polaris R12(50/36) helix
Polaris silver/blue sec spring in hole #2
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  #5  
Old 12-20-2010
westman995
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Fuck well ill have to double check whats in my primary. I do have the 220 jugs. Think my best bet would be to change out the secondary stuff first, since its stock secondary clutch off a 98 xc 700?
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  #6  
Old 12-21-2010
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on a non ves twin i would run the 38 flats before 40, the smaller carb will help with low speed throttle response.
compression is the fastest way to add response or build hp. on the 700 twin an aftermarket pipe adds 6-10 hp, you can add that same amount of hp by simple port job and compression, and you still look stock!! your throttle response will be light days ahead of a single pipe as well.

the other little trick to throttle response is light wieght wrist pins. putting them in alone isnt going to make a seat of the pants difference. but combined with compression and porting it helps make a big difference.
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  #7  
Old 12-21-2010
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And some 38mm round slides arent going to be of any advantage to me, right? Cuz i have a set of those here. I doubt that i would want to put those on tho.

Im not sure i want to take the motor apart. Maybe one of these summers if i keep it for a while, which im thinking i will.

Whats the fastest i would want to spin this motor at? I was trying to see how fast it spins at full throttle but i couldnt find a good place to keep it wide open and be able to look at the tach.

My head is stock, but if i recall it was fairly high compression for stock after i put the new pistons in it upon rebuild. Seems to be pretty decently high compression. Ill check compression on it again and see what its at.

I have the 220 jugs, i wouldnt even want to port those would i?
I really wanted to add a pipe or twin pipes, that stock pipe is so fuckin heavy its ridiculous. I want to get a can too cuz that can isnt light either.
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  #8  
Old 12-21-2010
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If you ever plan to pipe the sled, I'd go with the TM40's. They worked real well on my 700 and had instant snap at all RPMs once I got them tuned in. I forgot to add on my other post, I had the SLP top half intake thing on my RMK and the airbox was completely empty, just had the foam filter thing on top of it.

(I don't think I've ever disagreed with Jon before, this is a first!)
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  #9  
Old 12-22-2010
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kiens vs old mikuni round slides. i would almost go with the round slides to get rid of mid range and some low speed load up.ha!
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If the boner police are here I need a lawyer.

in a time of deciet telling the truth is a revolutionary act. george orwell.

aint no body ripin like me. M to the a-d-c-o-w. rock it hard for my fly ladies. I rock it yes in deed. homies still roll with me. money dont change me


nothing goes like 3 holes.

BRTECH HOODS
high performance engineering
aaen performance
millennium technologies
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  #10  
Old 12-22-2010
westman995
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Im betting the throttle calbes wont work tho, im sure the oil injection cable from the 38mm mikunis wouldnt even work on my oil injector on the liberty motor.

Is there a foam thing inside the air box on these? I cannot remember at the moment. But i dont even have the foam filter that goes outside/on top of the air box, i need to definitly get one of those if im going to remove everything from the air box. I shouldnt need to change jetting if i gut the air box? I have a set of filters for these carbs but i doubt i want to use those as it would prolly just pull in hot air and be worse?
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  #11  
Old 12-22-2010
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Or do what I recommended to Slamdry, put some pantyhose over the top of the airbox after you gut it, it's cheap and it works, and they come in all sorts of pretty colors!
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