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Loose pipe from cylinder to airbox and oil residue.

Mark D

Mark D

Joined Sep 2009
38 Posts | 0+
Worcestershire,UK
As in my last thread, my bike struggles past 130mph and has splutterd a few times in the last couple of days. Today i opened up the airbox and revealed a fair bit of oil and grit. Then on closer inspection i noticed that the pipe between the back cylinder and the bottom of the air box had come loose and sprayed oil over the outside of the air box and TB's. I have attached some pics and wondered if anyone could tell me what has happened and could this be the reason for the lack of power at high speed/revs.
Airbox.jpg

Loosepipe.jpg
 
They all collect a bit of oil in the airbox,especially if the motor is filled anymore than 2/3 between min & max,dont like the look of the grit in the airbox because that is going straight in the engine & not through the air filter,as long as it not been going on to long should be ok,I think the pipe is just a breather pipe from the engine
 
Yep, that's your crankcase breather pipe and it needs reconnecting straight away mate, that's how all that grits got in to your air box. :eatcorn

Get the air box off and give it a good clean out, as Vince says that grit will end up down your stacks mate and that's not good for the engine. :eek:
 
I have cleaned it out and re connected it but do you think the grit has come from outside or the crank case. Should there be a filter on the inside of the air box where the pipe connects.?
 
The air box would have sucked all that crap in via that disconnected crankcase hose, unfortunately a lot of that crap will have already entered the engine. :eek:

Thankfully the smearing of oil inside of the air box would have acted as a filter and trapped a lot of the crap, so fingers crossed all should be OK. :thumbup
 
So, worst case scenario the grit my have scored the barrel or what. Will i notice a loss in power.? .....The grit going in must have been the sudden cut off of the engine when giving it some, so maybe it just momentarily blocked the jets.
 
Mark D said:
So, worst case scenario the grit my have scored the barrel or what. Will i notice a loss in power.? .....The grit going in must have been the sudden cut off of the engine when giving it some, so maybe it just momentarily blocked the jets.
Click to expand...

The crap entering the air box unfiltered could indeed have damaged the engine, scored the bores/pistons etc....

I very much doubt that the grit entering the engine would have caused a sudden loss of power.

The grit couldn't have blocked your jets as these bikes don't have them, it would have simply gone down in to the bore and been burnt during combustion.

Seeing as that pipe was left off are all the others on and secure?
 
I did a check round and all seemed ok. Could the pipe have been blown off through pressure.
 
That will be the same guy who didn't put the cables back under the tank fastener clamp......Muppet.
 
Can't comment on whether you've damaged your engine mate, but what i can tell you is that it is essential that you check the oil level in the right way, i.e. take bike for 10 min run, leave to stand upright and level for 10 mins and check oil level, top up accordingly.
When i first got mine i spent weeks topping it up thinking i was loosing oil somewhere until i found a puddle under it when i returned to it after brekkie run, airbox full of oil which then runs back down engine and collects in bellypan/ runs out of bellypan. I reckon i drained 1/4 litre out.
Also if i remember rightly it did feel sluggish on that particular occasion, don't know if any techies on here can confirm that this could be the case?
 
Overfilling with oil could cause the bike to feel sluggish at the top end and will make more oil go into the air box.

Damaging your engine with grit is possible but with the amount shown in the photos and if it has only been for a short period of time I would doubt there would be much damage if any. Certainly not enough to notice a lack in power.

I used to run race bikes with no filter or just a mesh to keep the stones and rubber off the tyres out of the engines. Fair enough you re-build race bike engines more often but even using no filter the engine internals didn't look bad.

PS anyone looking at my race bike for sale It has always ran the Original Honda filter when on the road and with a K&N since being on the track.
 
For interest sake, do a compression check on the cylinders . . may be a badly shimmed valve gap.
 
Thanks for all your help guys, im feeling a lot better knowing theres guys like you around to help a muppet like me. What oil level am i checking by the way......?

Also i thought that maybe the bike did need a new filter(performance filter) as the deristriction of the air box would be somewhat limited by the standard filter.
 
Get yourself a Hooked air box mate, well impressive bit of kit. :thumbup

Given that you're experiencing issues with the engine performance and that this pipe was left off, it makes me wonder has someone been playing around with the TB settings etc....

Give Griff a call and have a chat with him, we all know sweet FA compared to him. :roll

Dunno how far you are away from Tamworth but it's well worth a trip to see Griff, trust me.


Mark D said:
Thanks for all your help guys, im feeling a lot better knowing theres guys like you around to help a muppet like me. What oil level am i checking by the way......?

Also i thought that maybe the bike did need a new filter(performance filter) as the deristriction of the air box would be somewhat limited by the standard filter.
Click to expand...
 
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