So Mark,could you please dig out what you use and
show us, in a pic or two, your readings of the old and
new style con rods. I would like to see the exact numbers
and how you get those precise readings. Can your
instruments measure if the con rod bushing is out
of round or not?

anyone have a gen 5.5 3ptR &5ptR turbo heads ...NIB for sale?

You are extremely ignorant.....

Whoa........ everyone just take a breath and chill for a sec,

we are all here to help not argue......

The point is, don't speak on things you have no clue about. Assume there is a few people out there that are machinists and have no issue reading something that is not digital before you make suggestions.

I think you will find the man you are talking about has a lot more clues than you realise my friend. It's a bit of the old pot calling the kettle black I think .
Use whatever rod or crank you like guys. Whatever floats your boat. You boys seem to know it all, despite having no direct contact with the GO factory, engine designers, or production teams etc on a regular basis unlike certain other people on here. Hey, what would they know anyway right ?
Maybe now we can get back to helping those on here that actually want to be helped with their problems, instead of having a dick measuring competition every 5 minutes.

What's everyone doing for a throttle return?

Mine's sticking ever so slightly and is giving me the sh!t's. Last meet i used 2 rubber bands, but they didn't last very long

Well just my 2 cents. wouldnt u think the factory would now what rods go with what motor?. so why would people put differnt rods in. just because they think there the same. i wouldnt.

I use GMK Supply "Carb-O's" - Silicone Throttle Return Bands. These are neat. They work better and last much longer than ordinary rubber bands.
Get them from A-Main

http://www.amainhobbies.com/product_...e-Return-Bands

If it's really sticky you may want to strip the carb down and check the throttle slide for gunge or a bur etc.

Hey Jeff - GMK also do the dust covers we were talking about the other night.

http://www.amainhobbies.com/product_...uel-Inlet-Caps

Check them out bro.

The goodie ouchless hair ties also work very well. You may want to take a close look at your carb and linkage and make sure it is pulling straight. If not just turn your carb a little to make a straight pull.

Since 22Racer is a top level professional machinist I am going to believe him on this one...manufacturers like to make all sorts of claims, but the truth comes out when the measuring tools are used.... Go has not changed the bushing size on the rods, its that simple....make all the claims you guys want but the fact is they are measuring the same

Mark @ Massive..your a good dude, but your advice on measuring tools is horrible...Rex is using top of the line gear that is extremely accurate, his measurements are right dude..your Mitsuno tools are budget gear next to what Rex is using..... I am not trying to take sides here, but Rex is way ahead of you guys when it comes to tooling and measuring...So badly you don't even realize it ....


I would take Rex's word guys, he knows how to measure, likely much better then the guys arguing with him....He is a 25 year plus pro machinist ! I think he knows what he's talking about...and anyone trying to argue with him on this is just being silly

Sorry for putting this in, I don't like taking sides, but I know rex and the skills rex has and all I can say is I trust him way more then the the guys from GO on this one...

+1 on the goodie hair bands, check linkage,check for build up or o-ring shavings .....every gallon i take my motors apart and clean and inspect


good ole carbys are the most over looked mistreated parts on our motors ..

anyone ?

I pull my motor apart after every race meet and measure sleeve, piston, crank pin, rod bush for wear and document it all with dates and literage. Also clean carbon off of piston and sleeve and head button, re-oil and assemble.

Carb i pull apart and inspect every couple litres.

I am unsure whos Mugen this is but this is a classic example of a linkage out of alignment. I had several motors act like they were sticking because of linkage issues. Sometimes it is the easiest things that cause the most trouble.