A forum for owners of Yamaha TTR250 trail and enduro bikes!

MikeBarnacle · Veteran Member

Bike starting issues,

hanzo · Senior Member

Hi mate repost this in repair maintenance section of forum for more help sounds like you may have a sprag clutch problem and regarding fuel flow is fuel in tank above reserve which i beleive is about 1 ltr of fuel .post in other section for more help 😉

MikeBarnacle · Veteran Member

Starting issue. With you tube video to help

bosi · Veteran Member

Mine was doing similar when the sprag clutch died. My thread there: ttr250.activeboard.com/t61048065/aftermarketsubstitute-sprag-clutch/

Or, to do it correctly, see here: ttr250.activeboard.com/t55558020/sprag-clutch-one-way-assembly-replacement/

However, I am not sure.

-- Edited by bosi on Tuesday 17th of November 2015 09:03:55 PM

MikeBarnacle · Veteran Member

That's 2 votes for sprag clutch. Will have a go and see what happens! Fingers crossed!

TTRfan · Super Guru

RE: Bike starting issues,

TTRfan · Super Guru

Sprag sounds suspect......

MikeBarnacle · Veteran Member

RE: Starting issue. With you tube video to help

peteBLUEttr · Super Guru

Let's hope you don't have to do too many other things after the sprag.

MikeBarnacle · Veteran Member

As long as I can keep my repair bill under control I don't mind. I've got the bike to do up and to learn on and hopefully one day soon hit those trails!

Needs new rear wheel bearings at some point soon too and no doubt a few other little things.....

bosi · Veteran Member

I guess it's better to order parts after disassembly. This way you will know what else you need.

hanzo · Senior Member

Good advice above you will need to inspect all other associated componenents as a failing sprag can cause damage to starter motor splines and large and small starter gears you dont want damaged gear teeth ect .hopefully you will be lucky and caught it in time cannot stress how important it is that all teeth mesh correctly to prevent damage and further expense . A flywheel puller and a torque wrench are a couple of essential tools you will need too

MikeBarnacle · Veteran Member

Sprag replaced but still no joy. All parts were in good condition inside! Bonus!

Someone said maybe the timing is worth looking at?
(Got a feeling I will be buying plenty of beers for people when the bike finally kick s into life!

-- Edited by MikeBarnacle on Saturday 21st of November 2015 04:59:27 PM

MikeBarnacle · Veteran Member

Additionally if I put the bike in gear and hold the clutch in it will not turn over at all, is this Normal for a ttr

Could the engine be ceased up

??

admbnm · Veteran Member

what voltage is the battery showing,on your video it doesnt seem to be spinning it fast enough.i hope you get it going.martin

TTRfan · Super Guru

MikeBarnacle wrote:
Additionally if I put the bike in gear and hold the clutch in it will not turn over at all, is this Normal for a ttr

Could the engine be ceased up ??

Sounds like the clutch switch (fits on the clutch perch) has failed Mike cry

The CDi won't let the starter turn if the engine is in gear without the clutch lever pulled in and actuating the switch.

Have you pulled the plug to check you have compression? Simple check is to put your thumb over the plug hole and turn the engine. It should push your thumb off the hole with a bit of force.

Whilst the plug is out put it back in the cap and rest the body of the plug on the engine to earth it. Crank the engine and check you have a regular good spark.

If all good then you probably need to get the tank off and check the cam timing is correct and that the valve clearances are within specification.

Have you undone the carb float bowl drain screw to check there is a good flow of petrol?

Does it fire if you squirt a bit of carb cleaner (or EasyStart) into the intake?

As Martin suggests, you need to make sure that battery is fully charged so that it turns the engine quickly to give the best chance of blowing out the cobwebs and getting it started.

Brian

hanzo · Senior Member

Sounds a bit stupid but you did have stand up when you pulled in clutch . Also agree the battery dont sound 100% in video

-- Edited by hanzo on Saturday 21st of November 2015 10:25:17 PM

MikeBarnacle · Veteran Member

Yep, I had tried a few times to get the bike running and yeah the battery was probably a bit drained to be fair. I've tried a battery of my xjr and it did fire up!...... How ever it's only been in nutrel so let's see what happens tomorrow when I put her in gear for a ride down the drive.
🙂

MikeBarnacle · Veteran Member

She's a running! Next plan is to fix a rocking at the lower pivot/shock link, I feel some new bushings or something are gonna be in order soon

MikeBarnacle · Veteran Member

Starting issue.

MikeBarnacle · Veteran Member

RE: Starting issue. With you tube video to help

MikeBarnacle · Veteran Member

The pumpf noise seems to be a release of air from between the carb and the air intake.

TTRfan · Super Guru

Hmmm - even if the inlet stub is damaged (the rubber parts company with the ali stub over the years) the TTR should still fire even if it doesn't start and run properly.

Do you still have compression? If not, the engine will crank over very quickly.

If it is cranking over at the same speed as when it was running OK then I can only suggest there is a problem with the inlet stub.

Brian

MikeBarnacle · Veteran Member

Yeah it cranks at the same pace, compression seems to be good, I took the plug out and pressed the ignition, it gave my finger a good push!

There is a small bowl that seems to come off air in take that had a nasty smelly milky water in it, I've drained it off...wasn't much but seems to be something worth removing from the air system. It's also worth nothing that there was a bit of it inside the large air box (not sure any of this is relevant)

the he bowl is just lower to my finger (right in image)

TTRfan · Super Guru

Emulsifier 1.jpg

The "emulsifier" is doing its job! Just empty the drain regularly and you should be OK.

Does it fire if you squirt some Easystart or equivalent into the intake?

Brian

MikeBarnacle · Veteran Member

I dont have any but will grab some tomorrow, where do I squirt it? (That sounds so wrong!)
Can I buy it at any old bike shop or will I have to go halfrauds!?

TTRfan · Super Guru

If the seat is off then squirt it into the snorkel otherwise take the airbox cover off and squirt it in there. Go steady as it is very flammable!

Easystart (any garage should have it on the shelf) is usually a last resort. If an engine doesn't fire with a squirt of it then there is usually a problem with no spark. Even if the spark is occurring at the wrong time it should backfire with it.

I have heard that clutch/brake or carb cleaner will do the job if you can spray it. Just don't overdo it!

Did you check you had a good regular spark when you had the plug out?

It's a shame the drain plug won't come out as that would have been an easy check that petrol is getting into the float bowl.

Was the plug wet and smelling of petrol when you took it out?

If not, check that you have a good flow of petrol to the carb by just lifting the petrol feed pipe off the carb a tad making sure you have a cloth to catch the petrol and no naked flames around.

Another way to check petrol is getting into the carb with a jammed drain screw is to put the TTR on its side and petrol should flow out the carb overflow but mind your back!

Brian

MikeBarnacle · Veteran Member

Might have to be a garage jobbie, I've given up

Tried all the above but not the carb cleaner, was advised that's not the best idea by hedgehog so may have to take her to irelands!

Though might cost a bit at least they should be able to get it back on the road again. It's annoying because it's probably something really simple and I just can't seem to work it out!

Unless anyone wants to earn a few quid

pug · Guru

Have a good look for this Sign in the shop some of them dont have it up for a laugh wink even I give up some times usually on the electrical side of things one thing i can never put my head round

MikeBarnacle · Veteran Member

I've seen that sign before...... No where was it!

TTRfan · Super Guru

Just in case you haven't seen it Mike there is a sort of "if all else fails" thread here - worth a look before you finally throw in the towel!

Brian

MikeBarnacle · Veteran Member

Yeah, I think I've been through it originally when I had the bike. I'm certain it's a fuel flow related issue. Everything turns spark plugs sparking well, I know this because I got myself a nice jolt too!

I'm sure the carburettor to blame and think maybe some bad fuel or dirt got in when I ran out of juice the other day and had to switch to reserve.

TTRfan · Super Guru

If you do take it in to a garage for repair then best get them to sort out the drain screw on the carb whilst they are at it wink

MikeBarnacle · Veteran Member

Happy new year all, today I have had the carb off and drained all the petrol out, it looked clean with no water inside the fuel in the bowl, I also checked the jet was squirting and it was freely.

I guess a spray of carb cleaner is next....

Not sure what else to check. Ok off to the garage the do we think??

TTRfan · Super Guru

Is the inlet stub intact?

Did you free off the drain screw?

Jets clean and not loose?

Pilot jet thoroughly cleaned and a bit of copper wire poke through to be sure to be sure? wink

If all that OK then next step is to put it back on and open the drain screw and make sure the carb is getting a good flow of petrol.

If it is then whip the tank off, make sure its clean underneath so no dirt drops in the engine when you take the cam cover off to check valve clearances and timing biggrin

MikeBarnacle · Veteran Member

Drain screw is ruined and I sadly dont know how to get it out.

All holes picked and prodded with wire,and the jets seem secure.

Not sure how to check the timing but I'm sure there's a thread on here. See see what I can find

Thanks again for your help

-- Edited by MikeBarnacle on Friday 1st of January 2016 06:39:56 PM

MikeBarnacle · Veteran Member

Should this be closed as its natural "home" position

MikeBarnacle · Veteran Member

Again image won't load up from my phone

TTRfan · Super Guru

MikeBarnacle wrote:
Drain screw is ruined and I sadly dont know how to get it out.

All holes picked and prodded with wire,and the jets seem secure.

Not sure how to check the timing but I'm sure there's a thread on here. See see what I can find

Thanks again for your help

Is the inlet stub OK?

Drain screw removal here

Valve clearances may be OK but worth checking. The important check is to get the engine to TDC (single timing mark not the H) - see photo in this "how to"

Any questions, just ask wink

Brian

MikeBarnacle · Veteran Member

Will get me one of the screw extractors tomorrow.

Thanks for the help with these, you must have serious patients! Finding this mechanics is really testing my blood pressure, so frustrating!!!! I'm enjoying the tinkering though

Gonna check the timing next......

I'm not sure what the inlet stub is

peteBLUEttr · Super Guru

Inlet stub is part between the carb and engine.

MikeBarnacle · Veteran Member

I don't have the necessary tools to check the clearances at the moment but can pick some up tomorrow

Is there anything else I can check ?

peteBLUEttr · Super Guru

As for the drain screw I think a regular soaking in penetrating oil and then clamp the float bowl of carb in a vice with rag to protect the bowl from damage from the vice.

Cubber · Super Guru

MikeBarnacle wrote:
I'm not sure what the inlet stub is

Mike, this is the inlet stub - it's what the carburettor is bolted to and then the stub is fastened to the cylinder head.

CLICKY

Martyn

peteBLUEttr · Super Guru

Did you check the compression with a proper dial gauge tool?

Could your problem be electrical? Does it have the correct model plug in it? Did you replace the slow cranking battery or does your current one hold charge?

MikeBarnacle · Veteran Member

Yeah, I have replaced the battery (the other one was duff) I also rechecked with my battery off my XRJ

I'm not sure if it's electrical issue wise, all lights etc work, fuse is fine too,

I haven't check the compression with a proper dial/gauge I just did the finger over the spark plug hole. There was a lot of push.

I did mention earlier about an escape of air. This is coming from the in take snorkel....is this normal?

peteBLUEttr · Super Guru

The intake on the carb? If so is the clamp on the pipe done up correctly? Is the pipe split?

-- Edited by peteBLUEttr on Friday 1st of January 2016 08:35:21 PM

JOHNYBOY · Super Guru

if you can hear a noise from snorkel could be inlet valve tight or bent do a leak test that will tell you something

MikeBarnacle · Veteran Member

The noise is a blow back of air back through where the snorkel is for the air intake under the seat.

peteBLUEttr · Super Guru

Hmm yeah does sound valve related.