Bog when hammering throttle

S

Scooter6901

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Joined
Jan 15, 2008
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10
Age
56
Location
Saskatchewan
Hi Guys,

I ride a 2000 VMAX 700 Deluxe and know very little about sleds.

I took the machine to the dealer for som TLC ( New track, carb cleaning, and a once over ). Carbs were precautionary, track needed replacing, and I wanted to see if cleaning the carbs would fix the bog that I get off the start.

Clutches are all stock and so are the jets.

Tech suggested I could go 1 jet size smaller and that might help ..... but I don't want to mess with the thing as it has never burnt down, been very reliable and the carbs were pretty clean -- even though it had been about 4 seasons since cleaned last. Other than that everything is supposed to be in A1 shape. But the bog is still there.

He did point something out to me --- that the choke springs are typically very weak on these machines and sometimes the choke does not close all the way. Suggested that I open the lid and close with my fingers

Does anyone think it a bad idea to put some stiffer springs in there ( I was thinking that I would take the armour spring off an automotive brake line and cut those to size and see if that helps). Would this be a waste of time ?

Thanks in Advance,

Scott
 
dont use the breakline rap its not a spring i just strech the originals a little and its worked or go to hardware store and match up spring make sure your belt is good and deflection is right you can try leaning pilot circuit half turn may be loading up
 
A bog would usually be caused by a lean condition. The choke being partly on would cause the opposite - rich condition, and going to a smaller jet would make the problem worse if anything. It does not sound like the mechanic is too knowledgeable, he may not have done a good job of cleaning the carbs. If he was able to drive the sled (a place to run it and snow), he should have fixed the bog before it left the shop.
 
I have a '94 Vmax 600, and 500. The 600 gets close to 10 mpg, and the 500 gets less than 5 mpg. The 500 also tends to bog under normal acceleration when you get to the 5-6k area. I've been reading on forums all over that vmax owners from the mid to late 90's sled have had the same problem. If you punch the throttle it will take off like a rocket and accelerate fine, but get in the 6000k range, and it bogs before slowely climging to 7, and then taking off.

I cleaned the carbs this summer, and just installed a new track. So what are we looking at.. carbs? clutch? Where is all that fuel going? if the sled is running lean it should be using less fuel, no?

a clutch problem doesnt seem logical to me, since it takes off at 7k.

What can I try in the carbs.. settings, jets?

I don't want to be a prick, but I've read endless answers from people who are just guessing.. There are a lot of vmax owners out there who would love to get this figured out, so if you have a good answer.. let us know.
 
"I don't want to be a prick, but I've read endless answers from people who are just guessing.. ".....jwehr76

The members on this forum are great and very helpful people, every sled is different so I can only say that any suggestion would be a guess without actually seeing the sled.

My 600 twin, the clutch wieghts were so badly notched when I bought it that it would bog at about 7000 rpm. If you pinned it from the start no problems only happened when trail riding.
 
I had it out a little this weekend and was really trying to watch where the bog occurred. The sled engauges between 4000rpm and 5000rpm and if you are carefull the sled does not bog as bad if you increase the rpm to just before the sled starts moving and let it idle there a second before hammering the throttle. Some better fuel also helped.

The choke appeared to be working OK. Brake line spring Bad --got it.

I think this sled runs a little rich actually because it goes through a bit of oil. I am OK with that as with my lack of knowledge I am really scared to tinker with a setting and then burn it down. Would rather perform a little less than optimum but have a well lubricated/cooled machine. Reliable is what I am after .... but that bog really bugs me.

Someone suggests fuel loading may be the problem --- if this is adjustable by a pilot screw or something ..... refering to eh OEM blow apart diagrams ..... which one and how do you adjust them. What is a factory setting for these "pilot circuit : jets ( guessing #20 from the diagram )
 
Try turning the fuel screw out some more. You can thank mrviper for the picture. Make sure you do all 3 of them. Factory setting is 1 1/2 turns out from lightly seated shut, we've found doing that we get a bog as soon as you hit the throttle hard off the line. We've since been turning them out to about 1 3/4 to 1 7/8. And the factory settings are for 330 to 1600 ft at 0-20F.
 

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Thank you MrViper and thank you SXlover.

I will try that and let you know how I do. Appreciate the help.

Most of Saskatchewan is about 350-700ft and nothing over 1500 FT and it is 0-20F quite a bit of the time . If it gets a little warmer out (say 8-10F) should I put the screw back in to 1 1/2 or will it be OK at 1 3/4 - 1 7/8.
 
Scooter6901 said:
Thank you MrViper and thank you SXlover.

I will try that and let you know how I do. Appreciate the help.

Most of Saskatchewan is about 350-700ft and nothing over 1500 FT and it is 0-20F quite a bit of the time . If it gets a little warmer out (say 8-10F) should I put the screw back in to 1 1/2 or will it be OK at 1 3/4 - 1 7/8.
Click to expand...

no you can turn it out and just leave it, well we do anyways
 
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