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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> 3000m severe bogging.
Post Info TOPIC: 3000m severe bogging.
dlee22


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3000m severe bogging.
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Hi all,

 

We are currently in Colombia just north east of Bogota and are riding some of the biketracking trails. Most the back roads are decent hardpacked tracks with the occasional areas where rai. Has dragged mud and stone.

Recently we've been in Venezuela up to 4400m odd, whatever there highest road is and the 250 was struggling a bit on the uphills but it never dropped below 30mph with an unadjusted card.

Now, one clean airfilter along the road we are down at 3000m but on steeper uphills the bike even in first just looses steam so quickly, it's strange. It's the first time I've actually had to push Roberta up a hill on the trip! 

 

If the land is flat its relatively fine, but anything else it seems to fall slow down and bog really quickly. 

 

I dint think there's anything wrong with the carb, nothings changed, it doesn't appear to be dragging air in, compression feels good on the kick starter, it revs through in other situations, fuels fine in mine, if the jets were blocked I'd have thought it wouldn't be great on the road normally, the carb as it is has taken her bike to 4985m a while ago.

 

It's easy to say it's a wimpy 250 pulling alot of weight etc at altitude up a steep track but it's managed worse before and ots the worst its felt in 12 months traveling in South America.

 

Any silly ideas? 

 

I'll drop the emulsifier tomorrow but I think that's unlikely to solve anything.

 

I'm trying to avoid taking too much apart in a small town as I've had bad experiences with that in the past.

 

This seems like a bit of a ramble so your patience is appreciated!



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Daniel Lee
TTRfan


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Is it better with the airbox cover off?

 



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Christos


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I had something similar and finally I found a difficult to see crack on the carb intake boot. Replaced the boot and solved the problem.

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dlee22


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Hi, it was worse with the air box cover which is unusual as we usually remove that at 3500m odd on the 250.

I'll check the boot again.

Fuel looks fine, blew the carb through the drain and the bike did 30kph up the steep hill rather than 15kph but it still didn't feel right.

So took the carb off and the jets looked fine cleaned the carb anyway, blew it through and then put the carb back on. Won't pull itself along on the flat now haha.

My 350 looks like an angel compared to Robertas 250

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Daniel Lee
mossproof


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You haven't put any of that "sugar cane gasoline" in like they have in Brasil have you? Clean, but very low octane.

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dlee22


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Hahaha I'm sure that's what gave Robbies bike piston slap, it also suffered 2 months in Boliva right before that! We try to go to the best furl stations but hasn't really worked out well for us. Part of the adventure I guess!

Christos - if the carb boot wasn't trashed it is now! Hopefully that's the issue and something can be adapted to suit!

Cheers guys!

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Daniel Lee
Christos


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That is unfortunate Dan. Well, while waiting for the new boot to arrive, I had applied polyurethane mastic on the old boot and worked perfectly. I used Sikaflex 11fc. It needs some time to set though.

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dlee22


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Sounds like a good idea Christos, we tried similar when it fell apart yesterday, it was worse than ever. In the end we found an inlet from another bike, took a little extra material of to make it fit and it was much better.

It went up the same hill in third gear so that's much better!

Cheers all

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Daniel Lee
Ttboof


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I run a cable tie around the inlet stub helps hold it tight when its running, found the inlet lasts much longer.  



-- Edited by Ttboof on Thursday 23rd of November 2023 01:01:57 AM

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