Newby with a 98 bigbear 350

[lasvegascop]

Hi everyone. I just bought a 98 BigBear 350 2WD. The manual states it has a YFM350 engine.
As I have been reading this forum it appears that a lot of Yamaha Quads have the same engine.
I was formerly an auto mechanic in a high performance garage so I have an understanding of 4 strokes and performance upgrades.
The bigbear is quite a slug in stock condition.
Do the mods that I see being used on other yfm350s apply to this motor?
Is a YFM350 a YFM350 no matter what quad it is in and only bolt on upgrades and cam separate the bigbear from a more performance oriented machine?
Of so maybe I can get the BigBear to wheelie? hahaha.. okok maybe not wheelie.
THis is a great forum.
Thanks

 

[chad021]

uh i just put almost a grand into my warrior, cam, springs, high comp piston, port and polish, exhaust, intake, and carb and it woke the motor up, but i was definately lookin for more performance than i got outta it, and she sucks more gas than the 500cc 2 stroke quadzilla i was runnin with

 

[dswwarrior350]

Really?


I get better gas mileage than almost anyone i ride with... then again it all depends on how much im playing around too.

 

[chad021]

i went through a full tank in almost an hour haha, but i wasn't holding back and the trails were pretty tight so i was always on the gas

 

[jasonp]

Really?


I get better gas mileage than almost anyone i ride with... then again it all depends on how much im playing around too.

I think I got 32 mpg when we went up north. Best out of the bunch. If I had my taller gearing in it would have been even better. Most of the time with higher compression your BSFC goes down because there is a smaller space for the air fuel charge.

 

[jasonp]

Yeah the mods all apply to your big bear.

 

[lasvegascop]

Ok. great.. That opens it up a bit to do some work on the engine. Maybe a slip on pipe, jets, mild cam. (dont wanna lose the great mileage this thing gets) and a shock upgrade.

BTW. I have been doing some research on pipes and it appears the only one that makes a slip-on for this bike is ProCircuit and its 375.00. Seems a bit pricey.

Any one recommend a pipe or a dealer that has good prices for old school utilities???

 

[jasonp]

HMF maybe?
With a high compression engine you get better gas mileage.

 

[lasvegascop]

HMF was my 1st choice but they start at the year 2000 for the big bear 350

 

[97warriorrider]

Pro circuit is a great pipe.i have it on my warrior..really opened the engine up good..well worth the money..

 

[dave76]

My choices would be Yoshimura, Pro Circuit, HMF. Just check that frames were'nt changed after 2000 and I'm sure the HMF will bolt up.

 

[lasvegascop]

thanx.. I have sent a few emails out to the various companies. I will see if they answer.