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Oil Pump Blanking Plate

  • peteyam54
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Oil Pump Blanking Plate was created by peteyam54

Hello, a bit of advice please - I need to get the autolube pump on my DT250A serviced, so I want to fit a blanking plate and run on pre-mix for a short period. When I remove the pump, I can take out the worm shaft OK, but do I need to take the clutch cover off to remove the bush (PN 1371317600 ) or does it pull out from the outside? Thanks
23 Jan 2021 11:30 #1

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Replied by asco on topic Oil Pump Blanking Plate

Welcome to the forum. When your oil pump is off and being serviced it is not absolutely necessary to remove the worm gear. The worm gear will not wear out. If you leave the pump on without oil then yes the pump will burn out. You should be able to send the pump in and have it rebuilt by one of the members here. Others will guide you. You do need to take the clutch cover case off to put a block off plate.
YAMA-LAND RESTORATIONS, 818-521-2109
This email address is being protected from spambots. You need JavaScript enabled to view it. 1971 CT1-C (BRANDY) 1970 DT1-C (MONICA) 1973 100cc Hodaka Combat Rat (ABBY NORMAL)
Last edit: 23 Jan 2021 17:38 by asco.
23 Jan 2021 17:37 #2

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Replied by MarkT on topic Oil Pump Blanking Plate

On that model the worm gear pull right out... Not sure if it could fall out with pump removed.

Bushing does come out from in to out but not sure if you could grab bushing and remove without damaging something.

Maybe use a couple longer screws and attach a block off plate over the end of the bushing?
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
23 Jan 2021 17:58 #3

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Replied by RT325 on topic Oil Pump Blanking Plate

Might be safer to just plug the bush rather than remove it as should be in there pretty tight plus may not go back in as good or straight--even though it should.
24 Jan 2021 02:54 #4

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Replied by peteyam54 on topic Oil Pump Blanking Plate

Thanks for the responses - really helpful. When I was thinking about fitting a blanking plate, I was in '4-stroke mode' ie, thinking about oil leaking from the crankcase - obviously with a 2-stroke, there's nothing to come out, just need to protect things going in! I was also trying to avoid buying a clutch cover gasket as they seem expensive in UK (17.50 euros plus tax/post from CMSNL - a whole new subject that I could do with some further advice on). Thanks
25 Jan 2021 04:59 #5

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Replied by Gr8uncleal on topic Oil Pump Blanking Plate

As long as the gasket is not torn, I would imagine that it can be re-used.
25 Jan 2021 05:30 #6

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Replied by MarkT on topic Oil Pump Blanking Plate

Actually oil would leak out. That's the clutch cover and behind it is the transmission oil.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
25 Jan 2021 07:09 #7

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Replied by peteyam54 on topic Oil Pump Blanking Plate

Yes, good point. I presume that normally the oil seal and oil pump spindle prevents gearbox oil coming out into the pump as well as stopping 2 stroke oil passing through the pump going back into the clutch?
25 Jan 2021 07:57 #8

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Replied by Pete-RT1 on topic Oil Pump Blanking Plate

peteyam54 wrote: Thanks for the responses - really helpful. When I was thinking about fitting a blanking plate, I was in '4-stroke mode' ie, thinking about oil leaking from the crankcase - obviously with a 2-stroke, there's nothing to come out, just need to protect things going in! I was also trying to avoid buying a clutch cover gasket as they seem expensive in UK (17.50 euros plus tax/post from CMSNL - a whole new subject that I could do with some further advice on). Thanks

Hi Pete, I think the gasket is available here
Yamaha DT MX IT 250 400 Clutch Cover Gasket
Buy It Now
I've used them before and the gaskets they've supplied have been fine.
Pete
Yamaha RT-1
Yamaha CT1-B
Yamaha CT1-C
Honda XR250
Last edit: 25 Jan 2021 09:31 by Pete-RT1.
25 Jan 2021 09:27 #9

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Replied by peteyam54 on topic Oil Pump Blanking Plate

Thanks - have ordered one. Cheers
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25 Jan 2021 14:39 #10

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