Switchback morph
- Thread starter Danbot
- Start date
D
Danbot
Well-known member
Well, my hanging idle is back, or still there depending how you look at it lol.
This motor passes leakdown tests cold, and runs fantastic until I make some long hard pulls in the deep, then it idles like it has an air leak for a short time. Plugs look perfect, and it still makes power the way it should.
I suppose I am going to get it hot, quickly disassemble the intake and exhaust to leakdown test it hot.
I also lost a ski rubber yesterday, managed to get my extra hood straps stuffed in there to finish the day.
This motor passes leakdown tests cold, and runs fantastic until I make some long hard pulls in the deep, then it idles like it has an air leak for a short time. Plugs look perfect, and it still makes power the way it should.
I suppose I am going to get it hot, quickly disassemble the intake and exhaust to leakdown test it hot.
I also lost a ski rubber yesterday, managed to get my extra hood straps stuffed in there to finish the day.
D
Danbot
Well-known member
Well the hot leakdown test passed. 6psi charge, lost about .5psi over 10 mins. This was after warming the engine up to 140 on the stand, but the idle remains perfect under these conditions.
My next step might have to be testing it immediately after some hard pulls when the symptom appears, have to find a place to do so with my truck and tools close by.
My next step might have to be testing it immediately after some hard pulls when the symptom appears, have to find a place to do so with my truck and tools close by.
Last edited:
D
Danbot
Well-known member
Ohhhhh SNAP
The coal mine I work at just changed my schedule... towards the end of April I will switch from 4 on, 4 off to 7 on, 7 off. No biggie but it's going to cost more to keep me entertained for 7 days! I loved my 4&4
Did anyone else get a little nauseated watching that Chris Brown crash? *shudder*
I'm hoping to get some more testing done on the 9 this weekend, maybe pull the head first and see what the wash says, and check for signs of o-ring leak.
The coal mine I work at just changed my schedule... towards the end of April I will switch from 4 on, 4 off to 7 on, 7 off. No biggie but it's going to cost more to keep me entertained for 7 days! I loved my 4&4
Did anyone else get a little nauseated watching that Chris Brown crash? *shudder*
I'm hoping to get some more testing done on the 9 this weekend, maybe pull the head first and see what the wash says, and check for signs of o-ring leak.
Last edited:
H
High Velocity
Well-known member
Dan, I hear ya on the shift I got twice the riding in on a 4X4 shift as I do on my 8X6 shift. On another note, you're a serious rider/wrencher, so it might be time for you to invest in a borescope to do cylinder inspections. Much easier than pulling the cylinder head every time.
D
Danbot
Well-known member
Meh, I got nothing but time Ken lol, and pulling the head off is a quick job. I have a feeling this engine will be out again before I find this quirk anyways... I'm really struggling to find this one.
I don't know if I will be able to buy a new sled next season.... probably not, so the 9 will get lots of attention this summer because it will either still be the primary sled, or a running and hopefully reliable backup.
As for as the 7x7 shift, it's all good so long as I can find people to bike with regularly. So far it sounds like there will be more than ever... some new guys to town working at the mine have bikes and quads so hopefully!
D
Danbot
Well-known member
Well, as my season is ending, I figured I would update...
My Switchback needs ski rubbers, and the weird idle is still there. I have hesitated to run it, because I fear it's an air leak and I just don't want to risk squeaking a piston again.
This is all summer work now. I will pull the engine at some point and look for the suspected air leak. My injectors will get serviced / tested as well.
Let the dirt bike season begin!
My Switchback needs ski rubbers, and the weird idle is still there. I have hesitated to run it, because I fear it's an air leak and I just don't want to risk squeaking a piston again.
This is all summer work now. I will pull the engine at some point and look for the suspected air leak. My injectors will get serviced / tested as well.
Let the dirt bike season begin!
LOL, nice, hopefully it will work out good for ya!
I tried to swap out my helix today for the one you gave me since I was working on the sled, but I can NOT get those darn screws out
I wound up breaking off my bit-tip before getting even one of them loose... 
D
Danbot
Well-known member
LOL, nice, hopefully it will work out good for ya!
I tried to swap out my helix today for the one you gave me since I was working on the sled, but I can NOT get those darn screws out
Yeah, they are a pain aren't they?!
TOTAL pain!
Thinking I'll buy a whole pack of tips and just go to town on the thing one of these days... then replace the lot of them with new as a couple are already a lil buggered up.
H
High Velocity
Well-known member
Dan, I've had the "hanging" idle on mine since day one. It's never caused an issue (knock on wood !!). Any time I've been working mine really hard and stop for a break, the idle will stay at 2000 - 2100 rpm, then slowly creep down. It's never caused a problem on my sled, so I've never really been worried about it.
Mine does that too, right around 2100 after a hard pull for about 5 seconds or so before dropping to normal. But if Dan is having the same issue as in Revy, he was revving MUCH faster than that... probably closer to 3K or better if I had to guess... definitely not the normal 'slight' hang.
D
Danbot
Well-known member
It's time to start planning for my sled work over the summer.... its a short list.
1-get the hanging idle weird problem fixed.... have to pull the engine and go over it with a fine tooth comb.
2-BIGGER TRACK!
Who has extended a 151 tunnel? I'm looking for the easiest / cheapest way to get enough aluminum to cover up a 166 that I hope to stuff underneath my 900 through the summer.
The rest should be easy enough...
-get a 166 track, and rails
-move the drop brackets back to match to the 166 location
I was also considering a 163 but the cost of the track is way higher for a modern track... 166's are cheap and effective.
Anyone have any experience with getting an slp pipe flash with a card that has been used? will slp do it? I don't know if the card has been used so I may run into this at some point.
1-get the hanging idle weird problem fixed.... have to pull the engine and go over it with a fine tooth comb.
2-BIGGER TRACK!
Who has extended a 151 tunnel? I'm looking for the easiest / cheapest way to get enough aluminum to cover up a 166 that I hope to stuff underneath my 900 through the summer.
The rest should be easy enough...
-get a 166 track, and rails
-move the drop brackets back to match to the 166 location
I was also considering a 163 but the cost of the track is way higher for a modern track... 166's are cheap and effective.
Anyone have any experience with getting an slp pipe flash with a card that has been used? will slp do it? I don't know if the card has been used so I may run into this at some point.
VE makes the tunnel extension with a bumper that Biggdawg and Z-man both used for their 151 sleds and covered 159 tracks...thats what i would use...little modifing required..
i have some stock 166 rails that are trimmed for anti-rachet drivers that ill hook you up with brother...hint hint...let me know.
hope all is well man...i FINALLY just installed my AVID drivers and stab kit on my 06...SOOO over racheting on the little hills...will test in the AM
i have some stock 166 rails that are trimmed for anti-rachet drivers that ill hook you up with brother...hint hint...let me know.
hope all is well man...i FINALLY just installed my AVID drivers and stab kit on my 06...SOOO over racheting on the little hills...will test in the AM
VE makes two different extensions that will work. The one Biggdawg and I have requires a little cutting but it not to hard to make work. The other one should be easier but costs more and doesn't look as cool.
I have a set of 151 rails with extensions to 163, cut for an anti-stab kit with new graphite slides on them if you want them
I have a set of 151 rails with extensions to 163, cut for an anti-stab kit with new graphite slides on them if you want them
D
Danbot
Well-known member
Ive been trying different gearing lately to try and get every mph of trackspeed possible without spending money lol. I'm looking for thoughts on my setup, any ideas or advice is appreciated! All I can seem to get is about 42mph working hard in the deep stuff. I think my 9 does good for a 151, but I just think there's a more to get somewhere..... and I ride with 163's all the time haha.
I have read about trimming track paddles a little here and there.
Is my track a good candidate for this?
Is the improvement from getting rid of the "fingers"? or from creating more paddle to bulkhead clearance?
Does anyone think that 19/42 is too low for my track length? (151x2.4) I threw my 40 on last week but haven't had the chance to run in good deep snow yet. It seems fine so far, not much of a change really.
I'm watching for deals on helix's right now, I think the one Carls sold me might be a little off (64-40.46/64-44.46) but at that time, it's what Chris K recommended for what I was doing.
This is on a low budget because I have started saving up for a new sled for next year! I'll keep the 900 around
I have read about trimming track paddles a little here and there.
Is my track a good candidate for this?
Is the improvement from getting rid of the "fingers"? or from creating more paddle to bulkhead clearance?
Does anyone think that 19/42 is too low for my track length? (151x2.4) I threw my 40 on last week but haven't had the chance to run in good deep snow yet. It seems fine so far, not much of a change really.
I'm watching for deals on helix's right now, I think the one Carls sold me might be a little off (64-40.46/64-44.46) but at that time, it's what Chris K recommended for what I was doing.
This is on a low budget because I have started saving up for a new sled for next year! I'll keep the 900 around
