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cammoquad
4fiddy Racer
Joined: 09 Aug 2007
Posts: 262
Location: Lewiston
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 Posted: Sun Nov 16, 2008 8:21 pm Post subject: Motor problem with TRX 450 -05 |
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Have 450TRX 05 (stock motor) need help with suggestions of motor breaking down when motor warm.
Had new spark plug put in, cleaned air filter, new inlet valves. What are the signs when the CDI is playing up!!!!
Bike has an inconsistant break down where motor feels like its just running out of fuel, and seems to be overcome by changing back down one or two gears and keeping motor reved a bit faster and then it comes good for a while, then will happen again.
Not good when racing speedway with this problem!!!
Bike is easy to start hot or cold, but motor problem seems to occur when been ridden for a while.
Anyone have any ideas!!
Cheers
Heather
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THANKS TO ALL WHO HAVE ASSISTED MY FAMILY IN THERE RACING OVER LAST FEW YEARS |
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Rjaye
50cc nipper
Joined: 12 Nov 2008
Posts: 2
Location: Currumbine
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| Posted: Wed Nov 19, 2008 3:13 pm Post subject: |
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| Just as a matter of interest have u modified ur airbox slightley in any way ? |
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4stroker
Joined: 15 Jan 2007
Posts: 1420
Location: North Queensland
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| Posted: Wed Nov 19, 2008 3:43 pm Post subject: |
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could be that your fuel cap vent is blocked
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2002 SE Banshee |
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PeteW
Moderator
Joined: 09 Feb 2006
Posts: 1877
Location: Doreen, Vic
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| Posted: Thu Nov 20, 2008 9:37 am Post subject: |
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If its a fueling issue it could be worth servicing the carb.
If you think it may be electrical it would more likley be the Coil or Plug cap than the CDI.
It would be worth checking the coil out anyway. I know you've got a service manual so you should be able to get the specs out of there and meter the Coil and plug lead. while you're at it I'd check the stator and pulse trigger too.
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www.thumbpump.com
www.dirtcomp.com.au |
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HSR
Blaster class
Joined: 11 Jun 2006
Posts: 122
Location: Melbourne
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| Posted: Thu Nov 20, 2008 6:22 pm Post subject: |
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Question: Was it doing this before the cylinder head was removed to fit the new inlet valves?
Answer 1 : No ! Then look at what has been done and make sure it was done properly.
Answer 2 : Yes ! Then you meust establish whether it is a fuel or ignition related problem.
Word of advise TRX/CRF Honda engines do not perform at all well with incorrect valve timing, no top end power if timing is retarded.
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we do not stop racing because we grow old
we grow old because we stop racing |
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ATV PRO
Roostin Away
Joined: 13 Feb 2006
Posts: 888
Location: Central Coast, NSW
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| Posted: Thu Nov 20, 2008 8:58 pm Post subject: Re: Motor problem with TRX 450 -05 |
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| cammoquad wrote: | Have 450TRX 05 (stock motor) need help with suggestions of motor breaking down when motor warm.
Had new spark plug put in, cleaned air filter, new inlet valves. What are the signs when the CDI is playing up!!!!
Bike has an inconsistant break down where motor feels like its just running out of fuel, and seems to be overcome by changing back down one or two gears and keeping motor reved a bit faster and then it comes good for a while, then will happen again.
Not good when racing speedway with this problem!!!
Bike is easy to start hot or cold, but motor problem seems to occur when been ridden for a while.
Anyone have any ideas!!
Cheers
Heather |
Give it a Compression test and even better cylinder leakage test to see if the piston and valves are ok.
Make sure the air filter is not over oiled or has water in it.
Check for Dirt or water in fuel and any filters at fuel tap and carby,Check Throttle positioner setting and Tank Breather ,if any doubt clean out tank ,and put liter of Metho in tank and drain ,let dry ,drain carby bowl and check for water or dirt
Go Through all electrical connections for water ,this is very common! Undo them check and spray with water dispersant like WD 40 ...
Check electrical components as per service manual .
Good Luck !
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Cheers
Len
ATV PRO Pty Ltd |
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cammoquad
4fiddy Racer
Joined: 09 Aug 2007
Posts: 262
Location: Lewiston
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| Posted: Fri Nov 21, 2008 1:29 am Post subject: |
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looks like the problem is in the coil or plug cap
Yes airbox is modified but has been for some time
but will be checking stator etc as per pete
thanks all for your advice will let you know if new coil fixes problem
Cheers Heather
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THANKS TO ALL WHO HAVE ASSISTED MY FAMILY IN THERE RACING OVER LAST FEW YEARS |
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The Day Starts With OZATV !
Joined: 09 Sep 2006
Posts: 1518
Location: Middleton SA
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| Posted: Fri Nov 21, 2008 12:41 pm Post subject: |
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The fact that it goes ok for a while and then starts to break down might make it hard to find.
When coils or stator windings get hot, if they do have integrity problems their resistance can increase dramatically or they can even open circuit.
Trouble is you don't really want to 'buy' every part until you eventually find the problem.
If you can get the problem to occur very regularly, sometimes 'swaptronics' is the easiest way to diagnose the faulty part.
Ask DrZ or Froggy if you can borrow their coil for a ride.
Stator is a bit harder 
If you don't find it, keep putting more symptoms up here for the guys.
Collectively, I reckon this bunch would eventually work anything out. 
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Can-Am X Team
Bullet #Y12. MrsB #Y18. |
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nazzame
90cc 2 stroke / 110 4 stroke
Joined: 31 Oct 2007
Posts: 74
Location: munno para west sa
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| Posted: Fri Nov 21, 2008 3:28 pm Post subject: |
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This guy knows his stuff,his name is steve warnes from betta bikes located at hacham.
this is the link to his web page,
http://www.bettabikes.com/index2.html |
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The Day Starts With OZATV !
Joined: 09 Sep 2006
Posts: 1518
Location: Middleton SA
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| Posted: Fri Nov 21, 2008 3:46 pm Post subject: |
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Second that, If it is electrical... Betta Bikes is one of the best in Aus.
And has been for a very long time.
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Can-Am X Team
Bullet #Y12. MrsB #Y18. |
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cammoquad
4fiddy Racer
Joined: 09 Aug 2007
Posts: 262
Location: Lewiston
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| Posted: Fri Dec 12, 2008 10:12 am Post subject: |
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Just to keep you informed
We have re-jetted carby & replaced coil so far problem seems to have dissappeared
We will be testing quad this week under race conditions will let you all know the outcome
Cheers Steve & Heather
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THANKS TO ALL WHO HAVE ASSISTED MY FAMILY IN THERE RACING OVER LAST FEW YEARS |
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The Day Starts With OZATV !
Joined: 09 Sep 2006
Posts: 1518
Location: Middleton SA
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| Posted: Fri Dec 12, 2008 11:43 am Post subject: |
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Cool, yeah let us know.
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Can-Am X Team
Bullet #Y12. MrsB #Y18. |
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cammoquad
4fiddy Racer
Joined: 09 Aug 2007
Posts: 262
Location: Lewiston
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| Posted: Thu Dec 18, 2008 10:32 pm Post subject: |
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Well looks like problem solved
She did speedway practise today with no missing at all ran fantastic
thanks for all you help guys
Cheers
Heather & Steve
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THANKS TO ALL WHO HAVE ASSISTED MY FAMILY IN THERE RACING OVER LAST FEW YEARS |
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