Well I have decided to go with the Hauck 700twin big bore for my 99' Vmax 500.
I mainly wanted to do it for the sleeper fact and that it will be different than the norm
My questions are, is there anything I can do to pep up my stock parts for this mod?
I will be running stock pipe so is there any mods I could do to my pipe? Or is there cheaper pipes out there that will FOR SURE add power?
Ive got the air box mod,reeds flared out,reed spacers and thinner head gasket.
I will be running nitrous on top of the 700bigbore (10 maybe 15 shots only)
Any info is greatly appreciated, Ill keep searching too
I mainly wanted to do it for the sleeper fact and that it will be different than the norm
My questions are, is there anything I can do to pep up my stock parts for this mod?
I will be running stock pipe so is there any mods I could do to my pipe? Or is there cheaper pipes out there that will FOR SURE add power?
Ive got the air box mod,reeds flared out,reed spacers and thinner head gasket.
I will be running nitrous on top of the 700bigbore (10 maybe 15 shots only)
Any info is greatly appreciated, Ill keep searching too
Been there
Dude, take it from someone who has had this mod. The twin motor is junk to begin with and prone to detonation. When I had this big bore from Hauck I got about 200 miles out of it before it grenaded.....the first time. Hauck did absolutely nothing to help me. Don't waste your money. If you want the power of a 700 go an find youself a SX or SXR 700. If you are in love with your sled then do a motor swap. You'll spend less money and have a better sled in the end.
Madmatt
Dude, take it from someone who has had this mod. The twin motor is junk to begin with and prone to detonation. When I had this big bore from Hauck I got about 200 miles out of it before it grenaded.....the first time. Hauck did absolutely nothing to help me. Don't waste your money. If you want the power of a 700 go an find youself a SX or SXR 700. If you are in love with your sled then do a motor swap. You'll spend less money and have a better sled in the end.
Madmatt
You are wasting your money!!!!!!!!!!!!!!!!!! The twins blow, and all modded up you are still only going to be in the ballpark of a 700 with some mild tweaking. But hey it's your money so......................
Good luck.
Good luck.
Why is the twin motor junk IYO?Madmatt said:
Did you ever find out why it grenaded?
Ryan B said:
Why do twins "blow"?
For what im looking for it seems to be the best option for me at this time with the sled I have. Being in the ballpark of a 700 is good enough for me at this time too... Ive heard a few negative things about this big bore kit(gas mileage(really doesnt bother me) and it may not reach what it advertises it to be.
No one really explains why it is "sooooo" bad. I like to hear advice from experienced riders so please give me more info on why Im making such a bad choice.
carpainter29
New member
What does the kit cost? Factor that in with changing clutch setups, gearing, fuel delivery, i think you could pick up a triple pretty easily dollar for dollar.
carpainter29
New member
Wow, just bought the wife a 98 MSRX for $1600. Runs like a scalded dog.
Go Ahead And Big Bore It And Let Me Know How It Works Out.
bravo-guy
New member
I don't see anything wrong with the Hauck Big Bore 700 kit, If I had a liquid cooled twin Yamaha, I would go that route, like you said, looks stock under the hood until you line up with another 500 liquid, and waste his sled, with the twin pipes, Hauck is claiming 130hp, which is around 20 HP more than the stock 700 triple red head. I'm like you, gas mileage doesn't bother me a lot, i ride to have fun, not be fuel efficient. To a certain point, if I was getting like 5 mpg I'd look into something else, but..... go for the Big bore kit man, I don't think you'll regret it.
bravo-guy said:
Thanks for the positive thinking with me on this
I will be sure to post up how it goes once I get everything installed and running correct
carpainter29
New member
Let me know how the kit works. Ive got a mint 99 500 sitting here as a spare. Might be a neat project.
hereismylife
Active member
Just for your info...
I did not hear the best about the twins. I did hear alot that they did burn down. I just got mine back up and running because the top went out. I also know guys have done this and wish they would of went with the 700 from the jump. I guess it is all on what you want to spend...
Good luck if you do it
I did not hear the best about the twins. I did hear alot that they did burn down. I just got mine back up and running because the top went out. I also know guys have done this and wish they would of went with the 700 from the jump. I guess it is all on what you want to spend...
Good luck if you do it
xsivhp
Active member
Sounds like you have your mind made up.
That said, I have seen more twins blown up than triple probably 100 to 1.
$1200 is too much to spend on the kit. I have a 1998 XTC 700 that hauls *** and will still smoke your sled after the mod - it will also get better gas mileage, use a little less oil and run forever!!! I have a friend with over 15k miles on a red head triple they are IMO the best engine Yamaha ever put in a snowmobile.
My xtc is my wifes sled. I may be selling it, if you're interested I may take your in trade as it would make an ok wifes wles and she says the 700 it too much for her.
As for the sleeper effect - it has a 600 hood on it!
That said, I have seen more twins blown up than triple probably 100 to 1.
$1200 is too much to spend on the kit. I have a 1998 XTC 700 that hauls *** and will still smoke your sled after the mod - it will also get better gas mileage, use a little less oil and run forever!!! I have a friend with over 15k miles on a red head triple they are IMO the best engine Yamaha ever put in a snowmobile.
My xtc is my wifes sled. I may be selling it, if you're interested I may take your in trade as it would make an ok wifes wles and she says the 700 it too much for her.
As for the sleeper effect - it has a 600 hood on it!
mbarryracing
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The twin's have an inherent bog around 6K RPM, that is more pronounced with twin pipes then the singles, and this is where they burn down. When driving them loaded at that RPM, and burning marginal quality fuel, the twin engine is prone to detonation which usually takes out a piston ring land.
Porting and combustion chamber reshaping can reduce it but doesn't seem to eliminate it as it appears to be intake tract pressure wave, or pulse resonation / harmonic related with that cylinder reed design. Ironic my PS800 Vmax 4 has this too, same cylinder reed design...
I simply clutched around it so it never runs in that bog RPM loaded hard and I have subsequently put 1000's of trouble free miles on my '96 600 twin.
Regarding a 700 big bore, in my experience the big bores for these twins don't make significantly more HP then a good 600. Proof was that I took my primary clutch from my stock 600 (at the time) and installed it on two different 700 big bore engines we tried (one Hauck and one PSI), just to run the sled, and they pulled the exact same RPM. Guess what? This indicated to me that they were making virtually the same power as my stock 600... Total snake oil if you ask me. Then a follow-up dyno session backed up my theory. Might be the reason that Bender Racing stopped building their big bores for the twins?
130HP is an extremely optimistic BMEP unless in full race trim with ultra high compression and high RPM pipes requiring use of race gas, especially since the BB use the same cylinder ports?
I predict you'll make less then 115HP with a stock pipe and pump gas, been there...
But atleast for $1200 you can brag you have a 700 big bore, but if it's performance your after then it might be cheaper to just bolt on set of '97 or newer 600 cylinders onto your 500? Even some good proven porting and head mods to those, maybe a set of twin pipes, all will cost less and likely yield more power... get you over 120 without NOS.
But then again, good decisions never make good stories.
Porting and combustion chamber reshaping can reduce it but doesn't seem to eliminate it as it appears to be intake tract pressure wave, or pulse resonation / harmonic related with that cylinder reed design. Ironic my PS800 Vmax 4 has this too, same cylinder reed design...
I simply clutched around it so it never runs in that bog RPM loaded hard and I have subsequently put 1000's of trouble free miles on my '96 600 twin.
Regarding a 700 big bore, in my experience the big bores for these twins don't make significantly more HP then a good 600. Proof was that I took my primary clutch from my stock 600 (at the time) and installed it on two different 700 big bore engines we tried (one Hauck and one PSI), just to run the sled, and they pulled the exact same RPM. Guess what? This indicated to me that they were making virtually the same power as my stock 600... Total snake oil if you ask me. Then a follow-up dyno session backed up my theory. Might be the reason that Bender Racing stopped building their big bores for the twins?
130HP is an extremely optimistic BMEP unless in full race trim with ultra high compression and high RPM pipes requiring use of race gas, especially since the BB use the same cylinder ports?
I predict you'll make less then 115HP with a stock pipe and pump gas, been there...
But atleast for $1200 you can brag you have a 700 big bore, but if it's performance your after then it might be cheaper to just bolt on set of '97 or newer 600 cylinders onto your 500? Even some good proven porting and head mods to those, maybe a set of twin pipes, all will cost less and likely yield more power... get you over 120 without NOS.
But then again, good decisions never make good stories.
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mbarryracing said:
This was my experience as well. I ran mine with the stock single pipe, but when the 700 only pulled the same clutching as the 600 did stock I knew it wasn't what I wanted to mess with.
Generally speaking if you want a bigger sled, you are time, and money ahead to just buy a bigger sled or build on the biggest sled that your brand makes at the time. The sleeper thing is cute, but most people are smart enough to know that if they get waxed by a 500, it probably wasn't a 500 anymore.
I had an old 91 phazer - did the whole pipe, porting, carbs, etc.. to it. It ran great, but required race fuel to not detonate and that's a little tough to find out on the trail. Sold it and bought a 98 600. Wanted more, found a cheap big bore, was disappointed in the lack of power and only burned it up twice. Sold that pile and got a 600 srx. Great little sled, but I wanted more so now it is a 780. Finally happy (for the most part), but horsepower is addictive so...
Bingo!
That is a really good explanation of the reliability issues with this motor. That is EXACTLY how mine blew up.......you are right on the $$ with everything from the RPM range to the resulting damage.......lost the ringland, spun the ring and hooked a port. It's also worth mentioning that I think you are right on the power issue too. Mine didn't run any better after the BB kit was installed......and it blew up then too.
Madmatt
That is a really good explanation of the reliability issues with this motor. That is EXACTLY how mine blew up.......you are right on the $$ with everything from the RPM range to the resulting damage.......lost the ringland, spun the ring and hooked a port. It's also worth mentioning that I think you are right on the power issue too. Mine didn't run any better after the BB kit was installed......and it blew up then too.
Madmatt
Alright, thank you Mbarry for explaining to me. I will call off the bigbore ( jugs should be arriving to hauck today)
Maybe ill just get my 500 pistons coated and run a little bigger shot of nitrous and save up for a blue 700 sxr sled. Ive always had a soft spot for the blue's
Maybe ill just get my 500 pistons coated and run a little bigger shot of nitrous and save up for a blue 700 sxr sled. Ive always had a soft spot for the blue's
i just picked up a 98 sxr 500 for 800 dollars,to build up my 98 srx 700 into an 835,the funny thing is i bought the srx for 800 also but it is mint and the 500 closelined and needs a new cowl but is otherwise mint. but what i want to know is, is the 500 reliable?