Problem Starting

Toddy · Post by **Toddy** » Sun Oct 21, 2007 1:01 am

I have a Trx in a buggy and the only thing that is different is that it has uni filters instead of the airbox. It always started without a problem with the uni's from day one. The motor had done 66000km's before it came out the bike which i bought as a wreck and another 10hrs in the buggy. It always started really easy with the choke on but now it needs to wind over on the starter for nearly 4 minutes or there abouts before it will fire. The first few times you try it there is no sign of life but eventually you will get a fire here and there and just before it starts running the firing becomes more constant and after that shes as good as gold. From then on it will start first time everytime for the rest of the day. It has new spark plugs which both seem like they are providing plenty of spark and you can smell the fuel. I've started it this way only a couple of times so the starter doesn't wear out. I hope someone can help me. Thanks
Toddy

ekoja · Post by **ekoja** » Sun Oct 21, 2007 1:19 am

Sounds like your valve clearances need checking

youngy · Post by **youngy** » Sun Oct 21, 2007 10:00 am

Agreed.

Did you rejet when you fitted the pod filters? If not then your valves may well be burnt, hence no clearances any more.

Toddy · Post by **Toddy** » Sun Oct 21, 2007 11:12 am

No i didn't rejet it always started and ran fine ever since its been in the buggy until now. What should i be doing to fix it?

Toddy · Post by **Toddy** » Sun Oct 21, 2007 11:29 am

I did notice that when when i take the uni's of the carbies now the motor starts to have the odd fire here and there alot sooner than when they are on. Where as before it never wanted to start with the uni's off.
Toddy

youngy · Post by **youngy** » Sun Oct 21, 2007 12:11 pm

If it were me, I'd check the main jets. 170 is what Trixz is using with K&N pod filters - I've not seen bigger Mikuni push in jets listed anywhere, but others may know. Stock is 142.5. Assuming you're running the original CV carbs.

Clean the air filters.

Check the emulsion tubes - look for wear seen as ovaling at the top of the emulsion tubes. Replace the emulsion tubes if needed. Check needles for wear while you're in there.

Check valve clearances.