The Montesa Cota 4RT Thread - Page 3

leanin · 05-12-2010, 06:14 AM

What is on the end of the exhaust? Is it a spark arrestor or a sound reducer? If it is a sound reducer, how well does it work?

brewtus · 05-12-2010, 06:24 AM

Quote:

Originally Posted by leanin

What is on the end of the exhaust? Is it a spark arrestor or a sound reducer? If it is a sound reducer, how well does it work?

That is the stock 4RT tailpipe restrictor. There are three restrictors: One in the headpipe at the cylinder head, one in the midpipe where the headpipe meets the muffler, and the tail restrictor. Remove these, and the power comes up significantly!

Johnnyboxer · 05-12-2010, 06:27 AM

Quote:

Originally Posted by leanin

What is on the end of the exhaust? Is it a spark arrestor or a sound reducer? If it is a sound reducer, how well does it work?

Here in Europe, I don't know if is a Spark Arrestor.............but I guess it is

It certainly is a noise reducer and is held in by a cap bolt

The bike is quieter and i think it aids back pressure, which would maybe boost or maintain torque, no doubt

LowPSI · 05-12-2010, 08:20 AM

Removing the first 2 restrictors is a good idea.

Removing the final one is a bad idea, unless you replace it with a spark arrestor.

Noise goes way up and power is only increased by tiny bit at full throttle. There is no low end improvement.

Most folks replace the final one with a spark arrestor and that also serves to keep the noise down.

Johnny B, the stock end cap is not a USFS spark arrestor, spark arrestors are required in most US western states and the most popular type are the "screen type"

Johnnyboxer · 05-13-2010, 04:14 AM

The Trial went well last night..................3 laps of 7 sections

Managed a few 'cleans' on 1st lap and in the more difficult sections, my scores got better each lap and I even managed to 'clean' one of the hardest sections on Lap 3........................so happy days

Need to get fitter, though............................the bike was perfect though

brewtus · 05-13-2010, 06:26 AM

Quote:

Originally Posted by LowPSI

Removing the first 2 restrictors is a good idea.

Removing the final one is a bad idea, unless you replace it with a spark arrestor.

Noise goes way up and power is only increased by tiny bit at full throttle. There is no low end improvement.

Most folks replace the final one with a spark arrestor and that also serves to keep the noise down.

Johnny B, the stock end cap is not a USFS spark arrestor, spark arrestors are required in most US western states and the most popular type are the "screen type"

I never noticed much change in noise with or without the spark arrestor on mine. Of course most of our riding areas here in Not-So-New Mexico are above 5000 feet, with the Haystack Mountain (more of a hill, really) riding area east of Roswell being the lowest at approx. 3600 feet. The air is pretty thin here. I did notice the 4RT's running at the National in Oklahoma (at 700 feet of elevation) had a SERIOUS bark to them without the spark arrestors (weren't required-private land) and the one that had an arrestor was still pretty roarty. I regret not taking mine just to see how it would run at low elevation.

BTW, congrats Johnnyboxer! Hooked yet?

leanin · 05-13-2010, 08:10 AM

Mine is an '07 with a stock pipe. The '07 pipe is different from earlier yrs. It doesn't have the end restrictor as shown in the pic. Does anyone know whether the end restrictor from an earlier yr will work on an '07 pipe? My bike isn't loud, but, I'd like it to be as quiet as possible for backyard practice. BTW, I have a spark arrestor for it. But, it doesn't seem to make the bike significantly quieter.

roadholder · 05-13-2010, 08:27 AM

A friend's new 4RT.
Whoops....traction control is turned off!

brewtus · 06-30-2010, 08:10 AM

I just got my latest issue of Trials and Enduro News yesterday. I found this article in the "pit pass" column:

The Japanese Trial Grand Prix at Motegi welcomed a very special guest. Mr. Takanobu Ito, Chief Executive Officer of Honda Motor, was an interested visitor at the Motegi World Trials. Mr. Ito spent some time with the Repsol Montesa team and enjoyed the opportunity to speak with current FIM Trial World Champion Toni Bou and his Japanese teammate Takahisa Fujimani. Mr. Ito confirmed that a new trial model was in the works and confirmed hes desire to renew the contract with current World Champion Toni Bou.

In the photo below, Montesa Team Manager Miguel Cirera watches as his boss Honda CEO Mr. Ito takes the Montesa for a spin in the pits at the Japanese World round at the Twin Ring Motegi circuit.

NMTrailboss · 06-30-2010, 10:25 AM

Quote:

Originally Posted by brewtus

I just got my latest issue of Trials and Enduro News yesterday. I found this article in the "pit pass" column:

The Japanese Trial Grand Prix at Motegi welcomed a very special guest. Mr. Takanobu Ito, Chief Executive Officer of Honda Motor, was an interested visitor at the Motegi World Trials. Mr. Ito spent some time with the Repsol Montesa team and enjoyed the opportunity to speak with current FIM Trial World Champion Toni Bou and his Japanese teammate Takahisa Fujimani. Mr. Ito confirmed that a new trial model was in the works and confirmed hes desire to renew the contract with current World Champion Toni Bou.

In the photo below, Montesa Team Manager Miguel Cirera watches as his boss Honda CEO Mr. Ito takes the Montesa for a spin in the pits at the Japanese World round at the Twin Ring Motegi circuit.

Bring it back to the states!!

ridenm · 06-30-2010, 11:28 AM

Quote:

Originally Posted by NMTrailboss

Bring it back to the states!!

...and maybe someday I'll be able to upgrade...

NMTrailboss · 06-30-2010, 01:08 PM

Quote:

Originally Posted by ridenm

...and maybe someday I'll be able to upgrade...

Me too!!

brewtus · 06-30-2010, 02:10 PM

You guys notice the lights and turn signals on the 4RT that Mr. Ito is riding??

lamotovita · 06-30-2010, 04:08 PM

Quote:

Originally Posted by brewtus

You guys notice the lights and turn signals on the 4RT that Mr. Ito is riding??

You can order those parts for yours if you want.

Johnnyboxer · 07-01-2010, 04:00 AM

In the UK, they come like that and are fully road legal........................we junk all that stuff

05-13-2010, 04:14 AM	#35
Johnnyboxer ^OP Studly Adventurer Joined: Oct 2003 Location: Yorkshire, UK Oddometer: 857	The Trial went well last night..................3 laps of 7 sections Managed a few 'cleans' on 1st lap and in the more difficult sections, my scores got better each lap and I even managed to 'clean' one of the hardest sections on Lap 3........................so happy days Need to get fitter, though............................the bike was perfect though __________________ So many roads...........So little time..!!! 2005 BMW R1150GS Adv - Black 2005 BMW R1150GS Adv - Silver 1998 Honda XR250R

06-30-2010, 08:10 AM	#39
brewtus Buffoonery, Inc. Joined: Jul 2008 Location: Albuquerque, NM. Oddometer: 2,269	Honda boss visits World Trial in Motegi I just got my latest issue of Trials and Enduro News yesterday. I found this article in the "pit pass" column: The Japanese Trial Grand Prix at Motegi welcomed a very special guest. Mr. Takanobu Ito, Chief Executive Officer of Honda Motor, was an interested visitor at the Motegi World Trials. Mr. Ito spent some time with the Repsol Montesa team and enjoyed the opportunity to speak with current FIM Trial World Champion Toni Bou and his Japanese teammate Takahisa Fujimani. Mr. Ito confirmed that a new trial model was in the works and confirmed hes desire to renew the contract with current World Champion Toni Bou. In the photo below, Montesa Team Manager Miguel Cirera watches as his boss Honda CEO Mr. Ito takes the Montesa for a spin in the pits at the Japanese World round at the Twin Ring Motegi circuit. __________________ Work hard. Play hard. Team Dead End. The drinking team with a Trials problem. 2-Time winner of the coveted "Best Shenanigans" award at Capt. Rick's annual BBQ.

06-30-2010, 02:10 PM	#43
brewtus Buffoonery, Inc. Joined: Jul 2008 Location: Albuquerque, NM. Oddometer: 2,269	You guys notice the lights and turn signals on the 4RT that Mr. Ito is riding?? __________________ Work hard. Play hard. Team Dead End. The drinking team with a Trials problem. 2-Time winner of the coveted "Best Shenanigans" award at Capt. Rick's annual BBQ.

07-01-2010, 04:00 AM	#45
Johnnyboxer ^OP Studly Adventurer Joined: Oct 2003 Location: Yorkshire, UK Oddometer: 857	In the UK, they come like that and are fully road legal........................we junk all that stuff __________________ So many roads...........So little time..!!! 2005 BMW R1150GS Adv - Black 2005 BMW R1150GS Adv - Silver 1998 Honda XR250R

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05-12-2010, 06:14 AM	#31
leanin Gnarly Adventurer Joined: Jun 2006 Oddometer: 115	What is on the end of the exhaust? Is it a spark arrestor or a sound reducer? If it is a sound reducer, how well does it work?

05-12-2010, 08:20 AM	#34
LowPSI Gnarly Adventurer Joined: Jan 2010 Location: California Oddometer: 191	Removing the first 2 restrictors is a good idea. Removing the final one is a bad idea, unless you replace it with a spark arrestor. Noise goes way up and power is only increased by tiny bit at full throttle. There is no low end improvement. Most folks replace the final one with a spark arrestor and that also serves to keep the noise down. Johnny B, the stock end cap is not a USFS spark arrestor, spark arrestors are required in most US western states and the most popular type are the "screen type"

05-13-2010, 08:10 AM	#37
leanin Gnarly Adventurer Joined: Jun 2006 Oddometer: 115	Mine is an '07 with a stock pipe. The '07 pipe is different from earlier yrs. It doesn't have the end restrictor as shown in the pic. Does anyone know whether the end restrictor from an earlier yr will work on an '07 pipe? My bike isn't loud, but, I'd like it to be as quiet as possible for backyard practice. BTW, I have a spark arrestor for it. But, it doesn't seem to make the bike significantly quieter.

05-13-2010, 08:27 AM	#38
roadholder Beastly Adventurer Joined: Jul 2007 Location: Ottawa, Canada Oddometer: 1,980	A friend's new 4RT. Whoops....traction control is turned off!