Jump to content

TT-R 225 and TT-R 230 mods thread.

Recommended Posts

Below are a list of mods I have found or resources for the 225! Some of these are similar to the 125 mods already posted but for ease of search and to give some love to other 225 riders/owners who want to do some mods to their bike I will list them here in a compiled thread, which I will update as I find more info. Hopefully this thread ends up stickied.

Apologies for the repost, not trying to spam.

Disclaimer

These Mods may void your warantee please perform these mods at your own risk. Ask for friendly advice in these forums and seek out reliable technical information before doing any modifications you do not fully understand.

That being said!

Enjoy!

Air Box Mod

This modification may or maynot require rejetting. Credit due to Ovrrdrive who is the original author and host for the links! Great Guide !

*Special mention to ChemFrk and SailGreg for providing this info to me in private messages since I didnt look in any of the 125 thread for 225 mods.

Here's a pic of the stock airbox after I removed the seat.

http://www.ovrrdrive.made2own.com/TT125_jetting/images_800/Img_2331.jpg

The snorkel comes out with a little tug and wiggle...

http://www.ovrrdrive.made2own.com/TT125_jetting/images_800/Img_2332.jpg

Here's the box after the snorkel is pulled.

http://www.ovrrdrive.made2own.com/TT125_jetting/images_800/Img_2333.jpg

I didn't really want to gut the box, or hack it up really bad so I looked at a different option. I had a holesaw handy and decided to just put a big hole in the top of the box to open it up. I think it looks a little more professional then hacking the box up...

http://www.ovrrdrive.made2own.com/TT125_jetting/images_800/Img_2334.jpg

The screen is accessable from the door on the side of the airbox. Just pop out the 3 screws holding the door on and it's right there.

http://www.ovrrdrive.made2own.com/TT125_jetting/images_800/Img_2338.jpg

Here's a pic of the airbox after the screen is out.

http://www.ovrrdrive.made2own.com/TT125_jetting/images_800/Img_2339.jpg

And after all was said and done, the only parts I had left over were ones I was supposed to.

http://www.ovrrdrive.made2own.com/TT125_jetting/images_800/Img_2343.jpg

*Also see the notes for jetting under the Jetting the 225 34mm Mikuni Carb section.

**You should opt to change the stock air filter*

***Suggested air filter: K&N - # ya-2292 @ $40 (prices may vary)

Exhaust Mod

Again credit is due to ChemFrk here!

First I removed the screw from the bottom of the exhaust end cap/spark arrester..http://img.photobucket.com/albums/v615/chemfrk/exhaust/MVC-433S.jpg

I then used a rubber mallet to TAP the end cap loose, http://img.photobucket.com/albums/v615/chemfrk/exhaust/MVC-434S.jpg

I then stuffed a shop rag down into the exhaust about 3 inches, to catch/trap any debris from the cutting i was about to do with my dremmel. http://img.photobucket.com/albums/v615/chemfrk/exhaust/MVC-437S.jpg

I then took the diamond cutting disk for my dremmel and started to cut the extension off of the stock exhaust from the inside.....http://img.photobucket.com/albums/v615/chemfrk/exhaust/MVC-438S.jpg

ensure that you cut the extension as close to flush as possible, or grind the excess off...http://img.photobucket.com/albums/v615/chemfrk/exhaust/MVC-439S.jpg

I used the BBR replacement end cap for the TTR 125 exhaust, along with their spark arrester,,,, total price about $45.00..

http://img.photobucket.com/albums/v615/chemfrk/exhaust/MVC-441S.jpg

The BBR exhaust tip fits perfectly onto/into the recess of the stock 225 exhaust, ( i used my son's exhaust tip to get all the measurements before i spent the cash on the new tip)

to ensure a good seal, I took some cut to fit gasket that i got from the local auto parts store for about $4.00.... I cut to fit the back side of the exhaust tip and replaced the BBR hex head screws with some self tapping metal screws from a local hardware store...$2.00

Total time was about 2 Hrs, I made sure I pre-drilled the holes for the metal screws to ensure that they did not separate the flat face from the interior of the pipe...http://img.photobucket.com/albums/v615/chemfrk/exhaust/MVC-442S.jpg

hope this helps, and it definitely saved a few bucks over an aftermarket exhaust,, and is a nice compliment to the airbox mod and jetting changes...

The 2 parts used in this mod, their approximate cost and part numbers:

Call BBR and order these two parts:

spark arrestor screen 12.95 part # 220-bbr-1003

billet end cap 34.95 220-bbr-1001

Added 8/18/05 FMF Power Core 4 pipe

https://www.fmfracing.com/products/catalog.aspx?CategoryID=42&ItemID=044021

Added 8/18/05 Big Gun Exhaust

http://www.pro-flo.com/big_gun_yamaha_exhaust_systems.htm#TTR

*Also see the notes for jetting under the Jetting the 225 34mm Mikuni Carb section.

Suspension (Rear)

Custom shocks and springs front(comming soon) and rear made to your weight and riding style.

http://www.worksperformance.com

Their part list and applications list is here

http://www.worksperformance.com/pdf/app_guide/dirtbikes.pdf

For you lazy people check this out. (added 9/1/05)

info.JPG

ttr.JPG

Suspension (Front)

Added 9/15/05 Thanks MeatRocket!!!

http://www.racetech.com/evalving/english/Srchpr.asp?bikeid=1186&manufacture=Yamaha&model=TT%2DR225&year=2004&TABLEINFO=dirt&langname=english

Jetting the 225 34mm Mikuni Carb

carbschem.JPG

1 5FG-14901-00-00 CARBURETOR ASSY

2 2A2-14997-00-00 .SEAL

3 812-14137-00-00 .CLIP

4 22F-14126-00-00 .GASKET

5 36X-14169-00-00 .CAP

6 26H-1490H-00-00 .DIAPHRAGM SET 5

7 2A2-14172-12-00 PILOT JET, AIR (1.2)

8 22F-14139-00-00 .CLIP, PIPE

9 137-14153-00-00 ..WASHER, MAIN JET

10 537-14186-00-00 .PIN, FLOAT

11 98502-04012-00 SCREW, PAN HEAD

12 12R-14191-00-00 .PLUG, DRAIN

13 2LN-14561-00-00 .O-RING

14 878-14147-00-00 .O-RING

15 3RW-14197-00-00 PIPE

16 98501-04008-00 .SCREW, PAN HEAD

17 92901-04100-00 .WASHER, SPRING

18 2LN-14933-00-00 .SPRING, DIAPHRAGM

19 98506-04008-00 .SCREW, PAN HEAD

20 92906-04100-00 WASHER, SPRING

21 2LN-14197-00-00 .PIPE

22 55X-14196-00-00 PIPE

23 4BE-1490J-00-00 .NEEDLE SET

24 4BE-14141-31-00 .NOZZLE, MAIN

25 2LN-14940-00-00 .DIAPHRAGM ASSY

26 3RW-1410A-10-00 .STARTER SET

27 29U-14197-00-00 PIPE

28 4G0-14142-40-00 .JET, PILOT (# 40)

29 620-14231-26-00 .JET, MAIN (#130)

30 2LN-14185-00-00 .FLOAT

31 1UY-14107-20-00 .NEEDLE VALVE SET

32 2LN-14147-00-00 .O-RING

33 2LN-14103-00-00 .THROTTLE SCREW SET

34 4BE-14105-00-00 .PILOT SCREW SET

Here is a link to a comprehensive Jetting tutorial/Guide provided by foxmotox321.

http://www.atlanticmx.com/archives/00000135.shtml

*If you perform the Airbox Mod and/or the Exhaust Mod you will most certainly need to rejet. It is suggested moving to a 132.5 from the stock 130. On the advice of my local Yamaha Techies its a good idea to go to a 42.5 pilot even on a stock 225 to help with the stalling on warming up a cold engine when applying any throttle. This will drasticly reduce the "warm up time" of the bike as from the factory the bike comes LEAN to pass emissions.

Visual guide to jetting the 34mm Mikuni carb

Scroll down to the 3 entry of this post I didnt have the room to post it in this specific post due to the 10000 character limit per post

Sproket Mod, Added 8/19/05

Thanks to Supermanttr225 for this info!

This mod will decrease the top speed of the bike but improve the acceleration and the feel of low end power.

PBI 50 tooth sprocket ordered it from D&E Yamaha in visalia CA 559 732 5912 for $58.97 You have to adjust the rim, move it back, and remove 2 links from the chain. Sorry dont know the part#. http://pbisprockets.cominfo.jpg

[230 mods by Yamajeb start on pg. 10 of this thread]

Share this post


Link to post
Share on other sites

thanks, theres alot of useful info here. Could somebody post some info on the jetting required after the airbox/exhaust mod? I.e. what size pilot and main jet?

Could any mods STICKY this??

Share this post


Link to post
Share on other sites

Visual guide for jetting info on the 34mm Mikuni carb

Added 10/8/05

Step 1:

Loosen the 2 hose clamps from the carb. Make sure they are loose enough that the hoses spin freely on the lips of the intake and injection side. Also make sure you disconnect the float bowl drain tube.

carb1.jpg

Step 2:

Twist the carb so it faces outwards illustrated below. Make sure you do this slowly, if you're uncertain about this you can label all the hoses with tape and a small colored peice of paper or use letters/numbers on a peice of paper. I just twist the carb because its simple and the hoses have enough slack to allow this.

carb3.jpg

Step 3:

Remove the 4 screws highlighted in red and remove the float bowl. I stripped the bottom right side screw so I cant get it off, BUT I highlighted the approximate location of the pilot jet and the main jet.

carb2.jpg

A) Is the fuel screw, this is hidden behind a brass cap, you need to drill it out, mine has already been removed.

:D Shows the approximate location of the Pilot Jet, stock is a #40 non bleed. It is up in a cylinder similar to the fuel screw.

C) Shows the approximate location of the main jet, the float and the float anchor scre is off to the right and easily mistaken as the main jet and the main jet is mistaken for the Pilot jet, while the pilot jet is mistaken as the fuel screw.

***Always make sure your jets are screwed in all the way!

****Make sure you do not unscrew the fuel screw (A) more than about 4 turns on the 225 carb, its much larger than the 125 screw and it is spring loaded.

*more to come when I get the replacement screw for the screw I stripped trying to do this visual guide :)

oh well, ENJOY!

  • Like 1

Share this post


Link to post
Share on other sites
thanks, theres alot of useful info here. Could somebody post some info on the jetting required after the airbox/exhaust mod? I.e. what size pilot and main jet?

Could any mods STICKY this??

Also if you need any help after you try the jetting specs already given to you, then use this link...it is a great 4-stroke carb jetting resource! :) It gives a good detail on pretty much everything. http://www.atlanticmx.com/archives/00000135.shtml :)

Share this post


Link to post
Share on other sites

Thanks for the GREAT link for jetting!!! I will probably edit the main post and stick your info/link in it for ease of reading! :)

Share this post


Link to post
Share on other sites

I can't claim any responsibility for the Exhaust or Air Intake mods. The main jetting info came from the Exhaust mod. The Pilot Jetting was tracked down by me speaking with local Yamaha technicians. The Suspension mods I researched and takes about 2 weeks time to build the custom shock w/spring. I am still looking for more mods to add to this thread so If you know of any good ones please let me know :)

Share this post


Link to post
Share on other sites

I rejetted my carb to the 135. Didn't know about the pilot. Opened the airbox and the exhaust. Runs great.I put a 5.5-7.5 variable shock spring on the stock shock and a pair of .48 fork springs. I'm 180 lbs. The bike works great.

Share this post


Link to post
Share on other sites
I rejetted my carb to the 135. Didn't know about the pilot. Opened the airbox and the exhaust. Runs great.I put a 5.5-7.5 variable shock spring on the stock shock and a pair of .48 fork springs. I'm 180 lbs. The bike works great.

Where did you get the springs from? I havent been able to locate anyone or any shop to make these so far.

Thanks a million in advance!

Share this post


Link to post
Share on other sites

I make them myself. But I cannot give out my websight. If you type in motorcycle springs on google, My company will be near the top.

KC

Share this post


Link to post
Share on other sites

ok so here i am got me a dirt bike a four wheeler for the wife and ready to have fun.....jump ahead 3 months and I'm ready to start playing around with some easy and simple mods.........nice thread on the 225 mods Thanx

did my own version of the tail piece put a new "custom" (HOME MADE) uni filter foam with some 1" round air box insets as well; chopped the snorkle off and opened it up but kept some h20 protection - now the question -

I am trying to figure out the fuel screw / pilot jet adjustment for the TTR225....I think the item #34 (pilot screw set is what I need to adjust the fuel per the instructions in your link to jetting the 4 stroke- its just a little brass column with a tiny hole in it???? put a small screw driver in and -no dice???

any help on how to jet the carb / find move the fuel / pilot jet screw???

s there something I'm missing here??

I'm not a master mechanice or anything but I know the basic and am handy - I am a white collar guy but from a blue collar family and have a fairly stocked garage and love to tinker -- I just need some direction - this mod stuff is fun! :)

Share this post


Link to post
Share on other sites

Your looking at the right column. There is a brass plug in it (I guess yamaha doesn't want any one messing with the screw beneath). you can drill out the plug with a small drill bit. If you go slow as soon as the bit goes threw it will tend to wedge into the plug and you can just pull it out with the bit. Note the plug is approximately 1/8" thick.

Share this post


Link to post
Share on other sites

My girlfriend bike is a TTR 230 2005, i was thinking that the engine was the same than the 225 so i called BBR to know what's available to modified on this model and nothing.... Do you know if the exhaust spark arrestor that goes on the 125 would be direct fit anyway?

Thanks!

Share this post


Link to post
Share on other sites

The arrestor peice for the 125 that would fit the baffle listed in the exhaust mod in this thread?

I am not 100% clear on what arrestor your' trying to fit on what cap/baffle...

Share this post


Link to post
Share on other sites

I have a 04 ttr-225 and i was wondering what i can do to make it have more power. so what do u guys suggest i do to it?

Share this post


Link to post
Share on other sites
I have a 04 ttr-225 and i was wondering what i can do to make it have more power. so what do u guys suggest i do to it?

See the first post in this thread.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:


×