|
|
| Author |
Message |
| yohomiesmelly... |
This post is not being displayed .
|
yohomiesmelly...
Two Stroke Sniffer
Joined: 03 Jun 2004
Karma :  
|
 Posted: 01:49 - 04 Oct 2004  Post subject: I NEED MINDS PLEASE..... |
 |
|
my damn  TZRr keep fouling its plug and i need you lot to help me think why before i torch the
i have tried:
correct jetting down from 148main and 38 pilot to 140 main and 38 pilot (asked dellorto and they say this is all good)
Adjusted oil pump to the minimum it can be at before going too lean
Tried iridium spark plug BR9EIX NGK and it still fouled
I ride it good without opening throttle too much and letting too much oil + petrol through flooding engine
Now if ANYONE PLEASE tell me what else to do and why it might be fouling the plug all the time
I have been told...
The DT125R engine always floods and i should turn the petrol off and run it dry out of the carb before turning it off completely????
The HT lead or spark plug cap or coil maybe faulty and not egniting all the fuel in the chamber????
(i tested the spark plug against the engine casing and it sparks yellow anyone know if this is good or bad????)
SO...
please help me before i lose hope in 2 strokes completely as i think i am on my VERY VERY last straw
CBR125r is sounding very nice at the moment tbh
thanks all (tht is if u actually look at the post lol) |
|
| Back to top |
   |
You must be logged in to rate posts |
|
 |
| stinkwheel |
This post is not being displayed .
|
stinkwheel
Bovine Proctologist
Joined: 12 Jul 2004
Karma :  
|
| Posted: 02:23 - 04 Oct 2004 Post subject: |
|
|
Your spark should be fat and blue. Sounds like you have a weak spark. (which would fit with plug oiling)
Suspect plug cap, HT lead and the coil earth (many coils use the point where they bolt to the frame for an earth, this is prone to rust) for starters, then check for corrosion/looseness on the terminals connecting to the coil.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
|
| Back to top |
| |
You must be logged in to rate posts |
|
|
| Frost |
This post is not being displayed .
|
Frost
World Chat Champion
Joined: 26 May 2004
Karma : 
|
|
| Back to top |
| |
You must be logged in to rate posts |
|
|
| divuk83 |
This post is not being displayed .
|
divuk83
World Chat Champion
Joined: 27 Nov 2003
Karma : 
|
|
| Back to top |
 |
You must be logged in to rate posts |
|
|
| Robby |
This post is not being displayed .
|
Robby
Dirty Old Man
Joined: 16 May 2002
Karma : 
|
|
| Back to top |
| |
You must be logged in to rate posts |
|
|
| yohomiesmelly... |
This post is not being displayed .
|
yohomiesmelly...
Two Stroke Sniffer
Joined: 03 Jun 2004
Karma :
|
|
| Back to top |
| |
You must be logged in to rate posts |
|
|
| divuk83 |
This post is not being displayed .
|
divuk83
World Chat Champion
Joined: 27 Nov 2003
Karma :
|
| Posted: 20:30 - 04 Oct 2004 Post subject: |
|
|
Can't explain the fancy plugs thing, but I know loads of people who have tried them and have switched back to a standard one as it didn't work well with it fitted. I have a br10es in my scooter and its running fine with that (plus there dirt cheap!). If you have been doing loads of slow riding then its wont have really been running of the main jet so maybe lowering the needle would help a bit. Really useful bit of info on carbs can be found here:
https://www.lambretta.co.uk/downloads/carbsetup.html
Dave |
|
| Back to top |
| |
You must be logged in to rate posts |
|
|
| Robby |
This post is not being displayed .
|
Robby
Dirty Old Man
Joined: 16 May 2002
Karma :
|
|
| Back to top |
| |
You must be logged in to rate posts |
|
|
| stinkwheel |
This post is not being displayed .
|
stinkwheel
Bovine Proctologist
Joined: 12 Jul 2004
Karma :
|
|
| Back to top |
| |
You must be logged in to rate posts |
|
|
| Kickstart |
This post is not being displayed .
|
Kickstart
The Oracle
Joined: 04 Feb 2002
Karma : 
|
| Posted: 22:10 - 04 Oct 2004 Post subject: |
|
|
Hi
Is this an Italian built TZR125? The one with Brembo brakes and a Dellorto carb?
If so I think this is the same carb as our Gilera CX125 (Dellorto VHSB 32). The carb floats in these do not pivot but instead slide up and down a pair or pins (2 floats in the carb, 2 pins per float).
With the CX we had major problems with the floats sticking. Turn the petrol off and you didn't flood the engine while parked, but as soon as you switched the petrol on it came out of the carb breather. Leave the petrol on and it slowly flooded the engine.
We could not fix this (and it is a common problem with the CX), and eventually got a carb from another bike (GFR125, just a slightly different example of the same model of carb) and swapped the jets over. It was fine then.
Not sure where you would get a carb from, but check that is is not flooding in this way.
All the best
Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing |
|
| Back to top |
| |
You must be logged in to rate posts |
|
|
| yohomiesmelly... |
This post is not being displayed .
|
yohomiesmelly...
Two Stroke Sniffer
Joined: 03 Jun 2004
Karma :
|
| Posted: 00:42 - 05 Oct 2004 Post subject: |
|
|
Again thanks all for the responses its all very helpful.
| Quote: | Can't explain the fancy plugs thing, but I know loads of people who have tried them and have switched back to a standard one as it didn't work well with it fitted. I have a br10es in my scooter and its running fine with that (plus there dirt cheap!). If you have been doing loads of slow riding then its wont have really been running of the main jet so maybe lowering the needle would help a bit. Really useful bit of info on carbs can be found here: |
thanks i was going to start looking into the carb on the weekend as i seems my engine is flooded all the time. Did your scooter take a BR9ES before you put a BR10ES in? Did it make a big difference to how it performed and stop it from oiling up?
If you could get back to me that would be excellent. Cheers.
| Quote: | Stick with the standard plug.
As a general rule, on a sporty 2 stroke the powervalve should be opening somewhere between half and three quarters redline, so if it redlines at 14000 RPM, I'd be wanting to spend the bulk of my time above 7000 rpm. |
My TZRr redlines at 12000 so would it be recommended i spend the majority of my time above 6000 revs? I myself generally keep it below 5000 unless trying to go above 60mph which i rarely do! I took the bike out tonight and warmed it up then used it as you said and it seemed to respond very well and became quite responsive to how it normally is. Would you recommend i move up a plug to a BR8ES (is this hotter) to stop my oil burning problem or do you think this would create more long term problems for me? Thanks.
| Quote: | Yes, a bit of emery paper to remove the rust and a slight smear of copper grease to stop it happening again. |
Will do as its cheap and i really don't want to buy the coil + HT lead and cap if this might solve it. Is there seriously a chance of this working? As it sounds too easy 
| Quote: | Hi
Is this an Italian built TZR125? The one with Brembo brakes and a Dellorto carb?
If so I think this is the same carb as our Gilera CX125 (Dellorto VHSB 32). The carb floats in these do not pivot but instead slide up and down a pair or pins (2 floats in the carb, 2 pins per float).
With the CX we had major problems with the floats sticking. Turn the petrol off and you didn't flood the engine while parked, but as soon as you switched the petrol on it came out of the carb breather. Leave the petrol on and it slowly flooded the engine.
We could not fix this (and it is a common problem with the CX), and eventually got a carb from another bike (GFR125, just a slightly different example of the same model of carb) and swapped the jets over. It was fine then.
Not sure where you would get a carb from, but check that is is not flooding in this way.
All the best
Keith |
Been waiting for you to pop in and lend a hand as i was thinking it was a carb problem myself but i couldn't see how as i had set everything up right. I do have the bike you mention which is the TZR125R Belgarda S.P.A Italian import 1991 with a Dellorto VHSA32GS carburettor on it. I have opened up the float chamber before and it seems they are pivoted but only slide up and down on a pin at one end (which is stationary, although the last time i opened the carburettor up the floats were ok and i made sure they did not stick. I have recently been turning the petrol off at the fuel cock before i stop and letting the bike run till all the fuel was out of the carb and the bike seems to start fine when i go back to it after a long time leaving it standing: say 8+ hours. Would it be ok if i just shut the fuel off before i stop and turn the bike off and leave it or do i have to make sure that all the fuel in the carburettor is emptied out before i switch the engine off. Also, does what i am doing harm the engine in anyway or form?
It does seem my bike is doing what you have said as i will be fine to start a few seconds later but leave it too long and its flooded again.
Can you recommend any other carburettors which will be equal to the Dellorto VHSA32GS carb i have on now and if so will i be able to just swap the jetting straight over? Or will i have to buy different jets from the manufacturer and start doing plug chops to find out if they are correct or are all 140 main jets the same size?
Does anyone have any tips for restarting a bike with a flooded engine? As i have been told to open the throttle fully and press the starter till it starts. Is this true?
Thank you all very much for your help it is very much appreciated |
|
| Back to top |
| |
You must be logged in to rate posts |
|
|
| Kickstart |
This post is not being displayed .
|
Kickstart
The Oracle
Joined: 04 Feb 2002
Karma :
|
| Posted: 01:11 - 05 Oct 2004 Post subject: |
|
|
| ukbilleh wrote: | My TZRr redlines at 12000 so would it be recommended i spend the majority of my time above 6000 revs? I myself generally keep it below 5000 unless trying to go above 60mph which i rarely do! I took the bike out tonight and warmed it up then used it as you said and it seemed to respond very well and became quite responsive to how it normally is. Would you recommend i move up a plug to a BR8ES (is this hotter) to stop my oil burning problem or do you think this would create more long term problems for me? Thanks. |
Once it has warmed up, rev it. Hard. It will be quite happy going up to the red line. If you want to take it easy just keep it between 7000 and 10000.
If you are using it at low speed a lot then maybe consider a BR8ES or a BR9ES plug, but if you do use one of those then do not thrash the bike with it fitted. A 9 would probably be a reasonable compromise for round town use with the odd short burst at high revs though.
| ukbilleh wrote: | Been waiting for you to pop in and lend a hand as i was thinking it was a carb problem myself but i couldn't see how as i had set everything up right. I do have the bike you mention which is the TZR125R Belgarda S.P.A Italian import 1991 with a Dellorto VHSA32GS carburettor on it. |
They were built by Belgarda who were the Italian Yamaha importer (they also built the SZR660).
| ukbilleh wrote: | I have recently been turning the petrol off at the fuel cock before i stop and letting the bike run till all the fuel was out of the carb and the bike seems to start fine when i go back to it after a long time leaving it standing: say 8+ hours. Would it be ok if i just shut the fuel off before i stop and turn the bike off and leave it or do i have to make sure that all the fuel in the carburettor is emptied out before i switch the engine off. Also, does what i am doing harm the engine in anyway or form? |
Doing that is fine. You don't need to let it run totally dry, but if you let it get rid of some of the petrol (that between the fuel tap and the carb in the pipe) then that fuel cannot get into the engine while parked.
However from what you have said I would say the needle valve needs replacing. These are available from the Dellorto importer and are not that expensive (although they can be a pig to fit). The needle has a rubber (well, Viton) tip which wears out and so doesn't seal anymore. As its job is to maintain the fuel level in the carb by preventing too much fuel getting in this is rather a critical problem! They come as a kit with both the needle valve and its seat. The Dellorto importer is in Reading, think they are called Eurocarb now.
| ukbilleh wrote: | Can you recommend any other carburettors which will be equal to the Dellorto VHSA32GS carb i have on now and if so will i be able to just swap the jetting straight over? Or will i have to buy different jets from the manufacturer and start doing plug chops to find out if they are correct or are all 140 main jets the same size? |
Different carb makers use different designs of jets. Plenty of them are not interchangeable between different carbs from the same maker (needle jets especially). You are best just sorting out your current carb as it would be a pain to try and jet a carb up from scratch.
There is a bit on Dellorto carbs here.
| ukbilleh wrote: | Does anyone have any tips for restarting a bike with a flooded engine? As i have been told to open the throttle fully and press the starter till it starts. Is this true? |
Try full throttle, just be ready to shut it quicky when it catches.
All the best
Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing |
|
| Back to top |
| |
You must be logged in to rate posts |
|
|
| yohomiesmelly... |
This post is not being displayed .
|
yohomiesmelly...
Two Stroke Sniffer
Joined: 03 Jun 2004
Karma :
|
|
| Back to top |
| |
You must be logged in to rate posts |
|
 |
Old Thread Alert!
The last post was made 22 years, 19 days ago. Instead of replying here, would creating a new thread be more useful? |
 |
|
|
Help & FAQs
Search BCF
Members
Groups
Events Calendar
rating
rating