DT125R ARCHIVE

Ralzy · Guru

Bike Overheating, Only on the tick over ??

Ralzy · Guru

NORFE wrote:
no the water pump impellor is a direct drive off the crank primary gear ...if the engines running its spinning the impellor and circulating coolant
id check head gasket 1st point of call
flat both surfaces and torque the nuts on installation to the correct setting,

Will do m8, I was lucky just and found a Gen Yami head gasket for a bluey from fleabay its a new one of course smile . Not sure how much they are to buy normally ? Saves me about £10 quid in having to go to Yeovil to pick one it up. Joys of living in the sticks hmm

Whilst on the subject about Gen parts anyone know off hand a Yami dealer that offers a delivery service if you buy parts from them as my one don`t offer a delivery service.

-- Edited by Ralzy on Sunday 25th of March 2012 12:14:02 AM

-- Edited by Ralzy on Sunday 25th of March 2012 12:14:33 AM

Ralzy · Guru

Hi All,

Been out today and when I had been riding the bike for say 30mins or so I pulled over for a fag stop my temperature was fine at that stage but I left the bike ticking over and it started to overheat and was only on the tick over I hadn`t been giving the throttle any welly or anything I switched the engine off and let the bike cool and took the rad cap off to find I couldn`t see any coolent in there took so I decided to head back home. Temperature dropped on the way home. I topped up the rad with coolent & same thing again happened when I left it ticking over but if i ride the bike the temp goes back down finding it a strange one. Anyone else ever had this or any possible ideas what it may be?

Cheers

MDK · DTR Legend

how long way it ticking over ?

could be the water pump

Grantypanty · DTR Senior Member

bike usualy looses water on tick over more then on the move cause it's not getting any breeze to the engine, but if it's a lot going then it might be the top end gasket gone.. means you'll have to sand down the barrel & cylender head then wack a new top end gasket on. I had a problem simular to my mtx 125!

MDK · DTR Legend

is there any water comeing out of the exhaust ? wouldnt say its head gasket unlees you see water on the ground or come out of exhaust .

can you not see any leaks ? or wet patches on ground ect .

would again guess at a water pump problem maybe not pumping water when bike is out of gear and tiking over ?

Ralzy · Guru

It is loosing a fair bit of water I left it ticking loads of times and never lost this amount of coolent I understand that leaving the bike standing it would get hotter but if I left it the way its getting hot now it would end up in the red & its never done that before also that I have discovered water on the ground that has came from the stand. But I`m fecked if I know where its coming from though lol

MDK · DTR Legend

you have to find where its getting out to find the problem either feel around or once its dry place tissue toilet paper around the ares you think its comeing from to find the source of the leak

Ralzy · Guru

Ok will try that one MDK to see if I can locate where its loosing the coolent from

Grantypanty · DTR Senior Member

Hope you get it solved dude, it's anoying as hell sorting out these bloody things :P

fused420 · DTR Senior Member

Ralzy wrote:
It is loosing a fair bit of water I left it ticking loads of times and never lost this amount of coolent I understand that leaving the bike standing it would get hotter but if I left it the way its getting hot now it would end up in the red & its never done that before also that I have discovered water on the ground that has came from the stand. But I`m fecked if I know where its coming from though lol

Your expansion bottle over flow feeds into the frame and comes out down by the stand. Sounds like a blown head gasket to me mate

Calum122 · Guru

Doesn't the water pump run off the engine. I.E. no throttle then little water circulation!

Ralzy · Guru

Good point fused420 like you said that is where expansion bottle over flow feeds into the frame and comes out down by the stand. then thats why i was having trouble finding where the coolent was coming from as I think your right with it being the head gasket I will have to order a new Gen Yami gasket and set what happens afterwards. Thanks smile

Ralzy · Guru

Calum122 wrote:
Doesn't the water pump run off the engine. I.E. no throttle then little water circulation!

I have no idea on that one m8 lol confuse

NORFE · DTR Trusted Engine Builder

no the water pump impellor is a direct drive off the crank primary gear ...if the engines running its spinning the impellor and circulating coolant

id check head gasket 1st point of call

flat both surfaces and torque the nuts on installation to the correct setting, smile

NEV · Guru

Try Dameralls Plymouth, or Fowlers of Bristol

Ralzy · Guru

NEV wrote:
Try Dameralls Plymouth, or Fowlers of Bristol

I will look them up & give them a bell. Thanks Nev smile

NORFE · DTR Trusted Engine Builder

all bits n bobs iv bought for mine were from aj sutton

fast delivery and can pay by pay pal 2

http://www.yamahamotorcyclespares.co.uk/SPARES/modelImage.asp?modelID=9028&uid=0

NEV · Guru

I use AJ Sutton for their exploded view parts list, Damerells and Fowlers are much cheaper, I always compare whenever I use the exploded view and Matt at Damerells has the same view but on microfiche.

Ralzy · Guru

I`m talking around between 7-8 mins on the tick over also If I go for a descent run on the bike say like today 22miles when I stop and have a break and switch bike off & not leave it running and come to get back on there is a wet patch on the floor around the stand the size of about 3 to 5mm so that leaves me now choice but to top up coolent all the while for now until I find out what is the source of the problem. It`s never done this before also I have done a recent top end rebuild not too long ago No Gen Yami gaskets used. But ive covered around 400 miles since then without any trouble. But I`m sure it is a gasket issue hmm

-- Edited by Ralzy on Monday 26th of March 2012 08:12:24 PM

-- Edited by Ralzy on Monday 26th of March 2012 08:26:01 PM

MDK · DTR Legend

any updates yet ? you found what it is or was ?

Calum122 · Guru

NORFE wrote:
no the water pump impellor is a direct drive off the crank primary gear ...if the engines running its spinning the impellor and circulating coolant
id check head gasket 1st point of call
flat both surfaces and torque the nuts on installation to the correct setting,

Right so back to my original statement NORFE, if it runs off the primary drive then without the engine running at high RPM the water won't circulate as quickly. Thus faster increasing the temperature of the water to a point where the heat disperses with the water rapidly making the bike overheat.

From his title 'Only on tickover' If it was the head gasket it would overheat no matter what. Plus he would keep finding less and less coolant when it does overheat. On tick over how long we talking? Five minuets are 10 or a couple of seconds or what.

If it's HG then your notice lots of oil in the radiator!

NORFE · DTR Trusted Engine Builder

with the gearing on both items crank & impellor shaft it will spin at a decent rpm when the engines on tick over, mine ticks over for a gud 10 15 mins befor the temp guage moves and then it gets 2 about quarter way up the scale and thats where it stays riding or not

fused420 · DTR Senior Member

If it is not the head gasket that has blown Calum, then what is causing his coolant to come out of the overflow?

Calum122 · Guru

I'm not saying it isn't. I just wanted to clear up my logic. As to be expect if the bikes overheating then the water is reaching a high temperature. So water expands as it heats up and evapourates so that would cause water to come out of the overflow. It most likely is the head gasket and head. However it's strange to say that it only does on tick over. If that's the case then clearly there is something wrong with coolant system. As when the bike is being risen air is getting to the cylinder cooling the coolant in the jacket. Probably not enough to cool it sufficiently but let's say it does then it wouldn't just be the head. Could be the water pump. But yeah if your losing water all the time and the bike overheats whenever then yeah best skim the head and cylinder and buy a genuine gasket.

MDK · DTR Legend

I think calum is right . the water is being pushed out of the overflow maybe due to boiling point steam pressure.

I have had jead gaskets go in past and it go.s two ways .

either water go.s inwards and maybe oil gets in to rad and water comes out of exhaust

or

outwards where you would see water escape out on to the head and engine .

norfe what if his bike is set at a higher tick over so this would over heat faster on tickover ? just a thought
I know we are talking about the same bikes here but all are diffrent in some way or other faster tickover / diff airbox or even carbs / derestrictions or not all these would make each bike either heat up faster than others . so to say my standard bike can tike over fine and so should yours statement holds no water . {forgive the pun}

MDK · DTR Legend

is there not some way to check if its getting in to the head and vaporising maybe at exhaust ?

whave you not noticed any oil- milky white in rad ?

Ralzy · Guru

No not noticed any oil- milky white in rad at all MDK

NORFE · DTR Trusted Engine Builder

yeah if its ticking over higher it will heat up faster, but reading the posts it leads twards head gasket, did u torque the hed nuts correct setting on rebuild then re check after a cupla runs??

they run at high pressures the coolant systems and if its got a small rout to take it will specially if its boiling it off aswell like cal was sayin, id strip top end, flat both surfacaces and put a yam gasket in, then if thats sorts it ur sorted

once or if the hg goes a few times heds warped and will never seal, crack on wi it and let us now how u get on smile

fused420 · DTR Senior Member

My non gen head gasket lasted after about 30 miles, lol, started noticing drips down by the stand when ever i stopped.. by the time i had done 100 miles i was poring out and leaving a puddle! lol Thats when i took her off the road for rebuild.

When i brought my bike it needed the HG (also non gen) doing, but the seller must have done a lot of riding with it like that because the cooling system was all gunked up with oil, real nasty! Anyway, cleaned it all up and done as i said above^^, but second time around the cooling system come out of it quite clean (no milky oil), which i guessed was down to the fact that i hadn't done as many miles with it like it, and it was constantly getting topped up with clean water.

I get what you are saying Calum, and you might be right, but my bet is firmly on the head gasket..