14 replies to this topic

[adam728 TT Addict]

Welcome to the new and improved(?) Yamaha 2-stroke FAQ!

I’m sure there’s more threads, questions, and links everyone would like to see included, but this thing is starting to get pretty lengthy. I tried to include links to threads that contain good info pertaining to somewhat common questions. This is a mix of the old FAQ, suggestions in there, and a few other links/posts. If you don't see what you are looking for in this thread, TRY THE SEARCH FEATURE! There’s 1,000 times the information available through searching than can be fit in this little post.

Engine

• Squish Band

o Squish Band Measuring By RB Designs(link external from Thumpertalk)
o RCannon’s RB Designs Head Mod
o THE Squish Band Thread

• Jetting

o Is Your Two Stroke Running Rich? : All about jetting
o The Great Spooge Experiment: Discussion/debate of causes and cures of the dreaded exhaust spooge.
o YZ 2 Stroke Set Up Database : Thumperalk user's engine mods and jetting

• Big Bores

o Powerseal YZ 290: CCC4’s review of his bike
o MaxPower 285 Build: LOCKGUY's enduro built ride
o Eric Gorr YZ300’s :  mrmoto’s , RCannon’s
o Harris Performance YZ144: PAdaytonaman’s review

• Misc

o YZ250 Timing Thread: Covers timing setup for 99+ YZ250 engines
o De-tuning a YZ250: Ideas for making smoother, easier to control power for off road riding
o Wiseco vs. Stock: The never-ending argument, forged Wiseco, or stock cast piston?
o RB Head and Big Bore Carb for YZ250: Review and info from HollywoodMX

o Why top ends need regularly scheduled maintenance

o BLACKeR's extreme piston breakage! (pics)
o UpAllNight's broken piston skirt (pics)
o cab500's broken piston skirt (pics)
o slimjaty's broken connecting rod (pics)
o slow hand's broken piston skirt

Exhaust

o YZ250 Pipe Shootout: Lots of info about the pipes available for the YZ250
o YZ250 Dyno Shootout: Simular to above, but with more than just seat-of-the-pants evaluation
o Port Tuner Insert:  Customize the power characteristics of your YZ250
o Pipe Spacer Thread: add more low end, cheap pipe tuning.
o Make Your YZ250 Quiet, with a FMF Q Stealth
o dBSnorkle Install: Another option for keeping quiet, by shrubitup
o YZ250 Pipe Dimensions, Stock, HGS, and DEP: Discussion about cone shapes and lengths, with a downloadable PDFof the pipes laid out, by BRM.

Transmission

o WR 3rd thru 5th in a YZ250: A how-to for putting wide ratio gears in your YZ250
o WR tranny : 1st Gear Case Grinding: Clearancing for for full WR 1-5th install in YZ250
o Replace Your Shift Stopper! : Updating 05 & 06 YZ125 shift stopper with more reliable 07 part

Suspension

o How Your Suspension Works : Short explanation of the basics of different suspension parts and their functions
o How To Tune Your Suspension: Some basics on how to properly dial in your bike, not just blindly cranking adjusters
o Updated KYB Shock Rebuild Procedure: Step by step instructions for rebuilding / bleeding KYB shocks
o KYB Free Piston Mod Procedure: Instructions for drilling KYB free piston for longevity and performance (05+). Includes assembly bleeding instructions for all twin chamber KYB’s which should be used when changing fluids
o Post Your Suspension Setup: Clicker settings, spring weights, etc, used by members here on their YZ’s

Chassis

o Aluminum Frame Swap: mxjosh swaps frames & his measures frame weight difference
o Lowering 2 Stroke Radiators: Using 4 stroke radiator lowering kits on your YZ250 (should work for YZ125 as well)
o Honda Front Brakes: Changing to Honda parts for improved braking
o OEM Yamaha Footpeg Options: Swapping pegs from other bikes

Miscellaneous

• Undertanding Yamaha Part Numbers: Guide to part numbers and what they mean
• Which Aftermarket Tank? Opinions on IMS vs Clarke vs Acerbis vs Zip Ty
• Trimming Side Panels: A sleeker look for late model YZ’s
• Let’s See The YZ’s: Two stroke picture-only thread
• Let’s See Your YZ’s In Action : Picture / video thread of two strokes tearing it up
• Factory Service Manuals: A wealth of downloadable info, everyone should have a service manual with their bike!
• Thumpertalk’s Own HOW-TO Section: Loads of great write ups
• How-to Videos From Rockymountain ATV: From changing a tire to rebuilding a bottom end, if you need a little extra confidence or just want to learn, check these videos out!

[Lefty Lucy TT Member]

Don't forget rolliew's excellent how-to on rebuilding a YZ250 top end!

http://www.thumperta...hlight=haralson

[mikeo33 TT Bronze Member]

thx much

[Yamaguy55 TT Gold Member]

excellent

[BDubb106 Get Help Now]

Thanks for this Adam... makes life much easier! Good work!

[Obie1 TT Newbie]

This is great..... THANK YOU

[kceby TT Newbie]

:banghead:

Could some expert please check out my post in Yamaha 2 stroke?!?

Thanks!

[RCannon]

Source for yellow plastic:  http://www.thumperta...d.php?t=1017351

[DRZ400Senior TT Platinum Member]

WHITE is the new Yellow. You can quote me on that

[adam728 TT Addict]

Test your timing for only $15! Dial gauge, dial indictor, ignition timing. : Tim 512's excellent pictorial how-to for timing.

[PlumpDragon TT Newbie]

OKAY i have a kx125 and its just falls apart every single ride, i heard that kawi's are on the short end of the time span when it comes to lasting beyond their 3rd birthday (i have a 2002) i have noticed though that i see a lot of people on similar year yz125's, like a lot a lot! Would you brand loyalist tell me anything other than that they can be older and still hold up?   Give me the scoop on early 2000 era YZ125's.

[dirtdevil72 TT Bronze Member]

What about the sss fork swap!!! Thats one of the most asked questions

[TTR230KING TT Member]

i have a 1980 Yamaha MX175 that started bogging suddenly, its been doing it for a week, i checked the compression, and the reeds are fine, i took off the exhaust header and cleaned all the carbon out of it, bike is in mint condition, looks almost brand new from 1980, please help, i'm thinking electrical...

[mtdirtbag TT Silver Member]

PlumpDragon, on 10 October 2012 - 11:46 AM, said:

OKAY i have a kx125 and its just falls apart every single ride, i heard that kawi's are on the short end of the time span when it comes to lasting beyond their 3rd birthday (i have a 2002) i have noticed though that i see a lot of people on similar year yz125's, like a lot a lot! Would you brand loyalist tell me anything other than that they can be older and still hold up?   Give me the scoop on early 2000 era YZ125's.

You will get more response by starting a new thread, this one is set-up for the blue heads to look up threads pertaining to fixes and modifications. I'm sure if you start a new one you will get a number of unbiased replies.

[folkbusk TT Newbie]

TTR230KING, on 20 April 2013 - 11:54 PM, said:

i have a 1980 Yamaha MX175 that started bogging suddenly, its been doing it for a week, i checked the compression, and the reeds are fine, i took off the exhaust header and cleaned all the carbon out of it, bike is in mint condition, looks almost brand new from 1980, please help, i'm thinking electrical...

its either the cdi or the stator.make sure its just not something clogged in the carb. i have a 79 model and it did the same thing intill i cleaned the carb.stator and cdi is expensive and are unreturnable if you put them on.so if there is no change your out of luck.