Accessing 750 front sprocket

TeddyG

TeddyG

Hero member
Location
Portland Oregon
Sorry for my endless questions, but how do I access the front sprocket? I want to inspect/clean that area that's probably covered in grease.
I removed the 6 bolts but don't want to force or break the cast outer housing. Does the chrome cover first need to be pried off, followed by the cast housing, and will the gaskets safely come off as I don't want to wait weeks to get new ones. I've got the Green Book but don't see any info for this.

Also, the sprocket on the primary chain is safety wired on place- is that hacked? The chain has @ 1" freeplay- time for a new one? Bike has supposedly 15K miles.
Thank you all!
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There is another bolt behind the triangular cover at the bottom. If you remove the triangular cover you will loose the engine oil. To avoid dropping the oil you can lean the bike over, block under the foot peg. Doesn't need much, say 35deg off vertical. Pay attention to the selector mechanism.
Pretty sure the green book has details on what to look out for. As for the starter chain, should have a circlip instead of wire
 
Alloy (not chrome) selector cover comes off to reveal the 4th of the main cover bolts. Use a knife or thin blade to work around the gasket to try and save it - they're usually fine.
Starter chain freeplay is not an issue - only in use while driving the crank.nI use a recycled triple cam chain on mine!

Beat me to it, Rob!
 
Reckon the oil would already be streaming out if it was a full sump! If the gearbox selectors have been set correctly, don't touch the eccentric adjusting screw. But DO make sure when you refit the main cover that the splined selector drum with the pins in it slides freely to engage with the inner spline/gear but with close to zero backlash. And don't let the washer that retains the pins in the selector 'drum' fall and let the pins drop. When refitting, align the marks on drum and inner gear/spline with the bike in neutral. Very simple, but many fuk it up inside this part of the motor!
 
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Thanks, the oil has been drained, the starter chain has @ 1” of deflection, I’ll find a circlip, and look at the Green Book for more info on accessing the front sprocket. I was hoping it would be a simpler procedure like other bikes to inspect the front sprocket.
 
TeddyG said:
Thanks, the oil has been drained, the starter chain has @ 1” of deflection, I’ll find a circlip, and look at the Green Book for more info on accessing the front sprocket. I was hoping it would be a simpler procedure like other bikes to inspect the front sprocket.
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All just pulls out easily as others have explained above, just sounds complicated.
Perhaps this might help - I have attached a pic what you will see when you remove the triangular cover (no 4 bolt circled in blue). Just take note of how the selector mechanism sits including spring on eccentric adjuster and the selector pin you take out will have a mark which you line up when replacing. (All just slide off/out.) Unhook the clutch cable and cover will just pull off. All just reversed to replace. (btw - a couple of seals might be worth replacing when cover is off too....;) )
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Thank you for your actually helpful information ! I looked at my Green Book info which also helps. I,ve found several things bodged/ loosely fastened on this bike by PO and am going thru it to check everything for safety. Laverda oddly wants the rear sprocket inspected more than the front. Most bikes just have a simple sprocket cover. I’ll leave it as is for now until I can obtain the gaskets as back up. Still waiting for other parts to clear customs here. I,m replacing the worn clutch cable and removed it.
 
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I have found that circlips from standard kits do not fit, and the wire solution although not ideal is better than a circlip that might jump off. I have seen it on a few SF probably for the same reason.
 
"and will the gaskets safely come off"
what kind of question is that?
easy to obtain no matter where you are on the planet as those two gaskets interchange with the triple.
circlip as well definately fit one, you can inspect the front sprocket with a torch, and some dexterity, revolving the motor as required, to check the teeth, no need to take off the outer or inner cover, get your finger grubby as well and touch it, (gynocologists are good at this) to see that it is tight on the splines.
CLEM
 
Seen plenty with wire - seen some with nothing - not a majorly stressed part - it only moves when you have your finger on the starter button!!

They're often hard to get off, which is probably why it'll stay put with nothing on it at all.
 
He did mention he wanted to clean the sprocket cavity Clem so the cover needs to come off to do it properly.
No big deal removing those covers and also gives him a opportunity to familiarise him with the workings of the selector mechanism.
And given the dpo has had his hands on the bike I'd be having a closer look.
 
Better dig out your Coal Shovel, the first time I changed sprockets and chain it was obvious no one had been in there for a very long time and the caked-on grit and chain lube was probably 10mm thick and more. One very dirt job cleaning it out.
 
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