"JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t" (jawzx2)
10/05/2015 at 12:45 • Filed to: two wheels bad, carburettors, stupid, PITA
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"JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t" (jawzx2)
10/05/2015 at 12:45 • Filed to: two wheels bad, carburettors, stupid, PITA | 4
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*sigh*
so I **FINALLY** got all the parts to finish the carb rebuild on my ‘97 BMW F650 Funduro... we waited on one peice from BMW Germany for three weeks, then finally called them and asked what was up, they said the part was EOL and not stocked, and they were sorry they should have kicked back the order immediately instead of leaving it marked BO :p
In any case, we took another two weeks to find one -a stupid little last-chance fuel filter- at a dealer in North Carolina, and now everything’s ready and we soak and clean the old parts and put all the new stuff in and check the valve clearances and wrestle the fucking carbs and airbox back into the bike (if you’ve ever done this on an F650, you know what a motherfucking bitch it is), struggle to get the damn fuel tank aligned again, drain out the gassy oil from when the carbs decided to puke fuel into the engine, hook it up to the jumper cables (battery is dead, need a new one) and start it... or try to start it... and continue to try...
does it have fuel?
yep
does it have spark?
yep
does it have compression?
yup (it damn well better)
is the choke linkage working?
yep
.....
so we hit it with some starting fluid and it fires... it runs like crap... meh, blow it out! Rev it to 5000, it has no throttle response, and the headers a glowing red in under a minute...
*not my engine, but it is a Rotax, and you get the idea (also I like the picture)*
So, it’s running hellishly lean... that explains it... but WHY????
then we think back to the reason we had to replace so many parts of the carbs... some one had “serviced” them previously...
*artist’s concept of previous carb service*
frankly it was surprising the thing ran as well as it did before it stopped working all together...
The old needle valves looked like freake’n step pyramids and were not sealing any longer and that was why it was running rich and puking fuel...
so we put new seats and valves in, but you know what? I bet the individual who serviced it previously didn’t. I bet that individual compensated for the worn valves by bending the tabs on the floats and just jamming them against the seats as hard as possible... again, its kind of a miracle it ran as well as it did...
we replaced everything else, but we didn’t replace the floats. we also didn’t check the float height... because everything was new! no need! it’s just goes together! it’ll be great!
WE NEVER CHECKED THE FLOAT HEIGHT.
fuck.
now we have to pull the whole goddamn thing apart again.
to fix something that would have taken 20 minutes if we had just not been idiots.
bob and john
> JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
10/05/2015 at 12:54 |
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you know what my only reaction to this is?
HAHA CARBS. HAHA,. (fucking hate carbs)
BobintheMtns
> JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
10/05/2015 at 12:55 |
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Might just be an airleak between the carbs and heads..... have you sprayed some starting fluid around there?
Xyl0c41n3
> bob and john
10/05/2015 at 13:06 |
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I’m a fan of proteins. Really, fuck fats. Fuck fats all day. Give me all the carbs.
:D
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bob and john
> Xyl0c41n3
10/05/2015 at 13:08 |
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...dam now i want pasta
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Xyl0c41n3
> bob and john
10/05/2015 at 13:10 |
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I know! That photo made me so hungry! I think I know what I’m making myself for dinner tonight. :)
Sneaky Pete
> JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
10/05/2015 at 13:21 |
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Yeah, I don’t like previous owners either. Note garbage welds and holes in both exhaust pipes, pre-cat that have cause numerous CELs on my car. Cheap, shoddy work...previous owner deserves a scalp massage with an ice pick.
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JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
> BobintheMtns
10/05/2015 at 13:25 |
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I suppose it could be... We checked the intake manifold for cracks, seated the throats deep and clamped tight... All The rubber actually looks really good on the bike, like so good I suspect it has been replaced... But no, we have not tried that... Will not get home before late tonight, but I’ll check it tomorrow...
also, we really just should have checked the float height when we rebuilt the carbs.
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JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
> bob and john
10/05/2015 at 13:31 |
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I keep looking for a first-Gen FI F650 with the Magnetti Marelli system, but those are few and far between... The later BOSCH-injected ones are locked down tighter than fort Knox and your only tuning option is to replace the FI system with something else... The MM system apparently lets you edit tables in a text file and push them to the ECU via dumb serial port...
deekster_caddy
> JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
10/05/2015 at 13:49 |
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I love doing things 3 times when they could have been done once!
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BobintheMtns
> JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
10/05/2015 at 13:50 |
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I had a MM system on a Gran Canyon I had a few years ago.... I expected the worst being “italian electronics” but it was really, really robust... loved it.
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JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
> deekster_caddy
10/05/2015 at 13:55 |
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ME TOO! meeeee toooo....
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JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
> BobintheMtns
10/05/2015 at 14:06 |
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Thats what the F650 forums say too: the BOSCH injected ones are reliable but un-tunable, and everyone says the MM injected ones are the best of all the F650s.
DarrenMR
> JawzX2, Boost Addict. 1.6t, 2.7tt, 4.2t
10/07/2015 at 20:31 |
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I bough a bike cheap on CL, that wasnt running. When I went to pick it up he had the stator cover unbolted and sitting on the sandy ground with sand in it. Sand sticks to oily surfaces like nobodys business. On top of that Im missing like 4 bolts.
Also I love the pic and gif you used. Hysterical.