Monster Big Bore Duals - Yamaha Raptor Forum
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post #1 of 10 (permalink) Old 05-11-2019, 10:52 AM Thread Starter
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Monster Big Bore Duals

Let me start off by saying, the ease of installation, quality of the system, and sound is probably the best I've heard on any 4 stroke quad. I've only done 2 rides on the system so far and have been hearing a weird scrape/swish sound over deep sand whoops. I found out the chain is scraping on the left side header pipe. Anyone else run into this? I've tried readjusting the pipes, and running a chain roller/removing chain roller, no difference. Chain is adjusted perfectly. I can't live with this for almost $900.

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06' 700 SE
-Fasst-
-Elka-
-GT Thunder-
-Alba-
-Lonestar-
-Streamline-
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post #2 of 10 (permalink) Old 05-11-2019, 11:10 AM
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Originally Posted by TorchTarga94 View Post
Let me start off by saying, the ease of installation, quality of the system, and sound is probably the best I've heard on any 4 stroke quad. I've only done 2 rides on the system so far and have been hearing a weird scrape/swish sound over deep sand whoops. I found out the chain is scraping on the left side header pipe. Anyone else run into this? I've tried readjusting the pipes, and running a chain roller/removing chain roller, no difference. Chain is adjusted perfectly. I can't live with this for almost $900.

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Torch,that chain is gonna eat that exhaust real quick,is there enough room to mount 2 chain rollers next to each other off the peg mounts.?Through thread holes in picture 1
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2002 Raptor 660,street quad,hotcams stage 1, motion pro twist throttle conversion,+1 inch wheel spacers front,+2 inch spacers rear,XTZ left hand switch cluster,shaved front bodywork,Maxis streetmax f+r, Alloy Boltz Inc stainless steel 600 piece fasterner kit. K+N filter. MotoGP grips.TM Designworks drain plug.Roads like Isle Of Man TT course
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post #3 of 10 (permalink) Old 05-12-2019, 03:56 AM
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F-word. I havnt had that issue, i will look mine over in the morn and see if i can tell any dif between mine and yours

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07' Raptor 700- 11:1, hotcam 3, Pro design intake with K&N, +3 throttle body, Monster big bore duals, MSD with cuervo timing, JOGACA shocks, trail tech VAPOR, GYTR heel guards & bumper & nerfs, .250 aluminum skids, TM case saver, folding anodized levers and shifter, powermadd hand guards

04' raptor 660-Hot rods crank, .5mm overbore, 11:1 wiseco piston, Stage 1 hotcam, Yoshimura slip-on exhaust, K&N filter with outerwears, open lid airbox, Dynojet stage 2 jet kit
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post #4 of 10 (permalink) Old 05-12-2019, 07:16 AM
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Another thought is to check the sag on your shock and do some adjusting there. If you have the preload adjustments set as super soft like a marshmallow there will be a lot of travel in the shock.
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[U]2006 raptor 700

DMC Force 4's, FCI W/box, Dynatek Fusion
CP 11:1 piston, BaMotorsports porting, HC3
RacersEdge +3TB
YFZ 450 fronts & reworked rear by JOGACA
Trailtech 1 1/8 xbar w/vapor dash & Vapor installed
ODI Rogue grips & ASV pro pack levers
PRM Edge Baja bumper w/12" Cree spot/flood bar
PRM Desert grab bar
PRM A-Arm skids, GYTR skid, ProArmor swinger skid
Fastway steering stabilizer
68HP 49TQ

PM me if you need service manuals
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post #5 of 10 (permalink) Old 05-12-2019, 07:18 AM
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Here is some reading material

https://www.raptorforum.com/forums/8...should-do.html
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[U]2006 raptor 700

DMC Force 4's, FCI W/box, Dynatek Fusion
CP 11:1 piston, BaMotorsports porting, HC3
RacersEdge +3TB
YFZ 450 fronts & reworked rear by JOGACA
Trailtech 1 1/8 xbar w/vapor dash & Vapor installed
ODI Rogue grips & ASV pro pack levers
PRM Edge Baja bumper w/12" Cree spot/flood bar
PRM Desert grab bar
PRM A-Arm skids, GYTR skid, ProArmor swinger skid
Fastway steering stabilizer
68HP 49TQ

PM me if you need service manuals
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post #6 of 10 (permalink) Old 05-12-2019, 07:32 AM Thread Starter
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It looks like I am up $h!ts creek on this one. My ride height is very low. I have a GT Thunder XC Linkage which lowers the quad by itself but I also have the YFZ450R front shocks and I have to have the rear preload set pretty low on the rear for the ride height to be dead even front and rear. I really don't want to jack up the rear suspension just to accommodate this exhaust. I cannot raise the front any higher nor would I want to. I have the suspension so dialed in it soaks up everything from deep whoops to 50' table tops. Looks like this is on me and I should have done better research. Sucks.
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06' 700 SE
-Fasst-
-Elka-
-GT Thunder-
-Alba-
-Lonestar-
-Streamline-
-PC5-
-Pro Design-
-HMF-
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post #7 of 10 (permalink) Old 05-12-2019, 07:36 AM Thread Starter
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Set up for XC pretty much

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06' 700 SE
-Fasst-
-Elka-
-GT Thunder-
-Alba-
-Lonestar-
-Streamline-
-PC5-
-Pro Design-
-HMF-
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post #8 of 10 (permalink) Old 05-12-2019, 07:54 AM
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I think your gonna have to get/fabricate some sort of chain guard to sit under the exhaust.Forgive me if I don't make much sense as i'm full of chest infection and head cold. Sweet ride though
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2002 Raptor 660,street quad,hotcams stage 1, motion pro twist throttle conversion,+1 inch wheel spacers front,+2 inch spacers rear,XTZ left hand switch cluster,shaved front bodywork,Maxis streetmax f+r, Alloy Boltz Inc stainless steel 600 piece fasterner kit. K+N filter. MotoGP grips.TM Designworks drain plug.Roads like Isle Of Man TT course

Last edited by Scotscockney; 05-12-2019 at 08:04 AM.
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post #9 of 10 (permalink) Old 05-12-2019, 08:16 AM
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Is your chain slack on the loose side? That would be my first adjustment. Next I would take the spring off the shock and cycle the suspension to bottom it out and see how close the chain is to the pipe and how much slack it has.
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post #10 of 10 (permalink) Old 05-12-2019, 09:46 AM Thread Starter
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No chain is actually on the tighter side. I thought about doing removing spring and measuring travel, but to what end? Like I said I'm really happy with where suspension is I don't want to start changing stuff. Looks like I'm gonna be going back to a single exhaust on this particular bike.

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06' 700 SE
-Fasst-
-Elka-
-GT Thunder-
-Alba-
-Lonestar-
-Streamline-
-PC5-
-Pro Design-
-HMF-
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